Basic Curves

8/14/2019 Basic Curves

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Common Options

Delta When this option is ON, any values you key into the dialog bar are relative tothe last defined point.

Point Method Lets you specify points relative to existing geometry, or by specifying a cursor

location or using the Point Constructor.

String Mode Lets you create an unbroken string of curves. When this option is on, the endof one object becomes the beginning of the next. To stop string mode, turn thebutton OFF. To break string mode and start it again with the next objectcreated, choose Break String or press MB2.

Break String Breaks the string of curves at the place where you chose this option, butString Mode remains active (i.e., if you create more lines or arcs, they will bein another unbroken string).

Basic Curves Line

There are several options on the Basic Curves dialog that are unique to line creation.

Basic Curves Dialog Options (unique for line mode)

Unbounded When this option is ON, any line that you create, regardless of thecreation method, is bounded by the limits of the view. (String Modeis grayed out.)

Lock Mode / Unlock Mode Use Lock Mode when your next action would normally cause the linecreation mode to change, and you want to avoid that.

Parallel options Options for creating parallel lines. The lines can be parallel to aWCS axis, or at a specified distance from a selected line.

Line Creation Dialog Bar Special Dialog Bar fields for Line Creation.

Angle Increment If you specify the first point, then drag the cursor around thegraphics window, the line snaps to each degree of increment that is

specified in this field. The Angle Increment is effective only when thePoint Method is set to Inferred Point. If any other Point Method isused, the Angle Increment is ignored.

To change the Angle Increment, enter a new value in the field andpress the key. (The new value will not become effective untilthe key is pressed.)

Other options on this dialog are common options (i.e., shared by several modes) that aredescribed in the Overview.
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You can change the angle and/or length of a line immediately after you create it, by keying newvalues into the dialog bar text fields and pressing .

Lock/Unlock Mode

When you are creating a line that is parallel, perpendicular, or at an angle to an existing line, andyou choose Lock Mode, the mode of line creation that is currently "rubberbanding" in the graphicswindow is locked. You can use this option when your next action would normally cause the linecreation mode to change, and you want to avoid that.

When you choose Lock Mode, the button changes to Unlock Mode. You can choose Unlock Modeto free up the line being created, to switch to a different mode.

Let's say you wanted a line through a point, parallel to line A, and ending at a point projected fromthe endpoint of line B.

When you have specified the start point and selected line A, the new line "rubberbands" parallelto the line A. At this time, the word "Parallel" is displayed in the Status line. However, if you try toselect the endpoint of line B, to determine the projection for the end of your new line, the line willsnap to that endpoint - not what you want.

Press MB2 to choose Lock Mode, which is the default action. Now you can select the endpoint ofLine B to establish the end of the new line.


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Basic Curve ArcsWhen you are in arc creation mode, there are several options on the Basic Curvesdialog that are unique to arc creation. These options are covered in this section.

Basic Curves Dialog Options (unique for arc mode)

Full Circle When this option is ON, any arc that you create, regardless of the creationmethod, is created as a complete circle.

Alternate Solution Creates the complement of the currently previewed arc; can be used onlywhile the arc is being previewed. If you choose Alternate Solution after

moving the cursor to the dialog, the previewed arc changes and you will notget the result you want.

Creation Method Specifies how the points (or other objects) that you select will be used todefine the arc.

Arc Dialog BarFields

The dialog bar includes special fields for arc creation and editing.

Other options on this dialog are common options (i.e., shared by several modes) that aredescribed in the Overview.

Creation Method

There are two basic methods for creating arcs:

Start, end, point on arc

With this method, you can create an arc that passes through three points, or which passesthrough two points and is tangent to a selected object.

The object selected for tangency to an arc cannot be a parabola, hyperbola, or spline.(However, one of these objects can be selected for tangency to a complete circle.)

Center, start, end

With this method, you define the center point, then the start and end of the arc.

The start and end points can be adjusted by entering angle values in the dialog bar, asshown below.

Dialog Bar Fields

The following fields are available in the dialog bar during arc creation and editing:

The XC, YC, and ZC fields display the location of the arc's start point.
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The Radius field displays the radius of the arc.

The Diameter field displays the diameter of the arc.

The Start Angle field displays the beginning angle of the arc, measured from the XC axis andmoving counterclockwise.

The End Angle field displays the ending angle of the arc, measured from the XC axis and movingcounterclockwise.

The Start Angle and End Angle fields are grayed out when you are using the Start, End,Point on Arc creation method.

Basic Curves Circles

In the first portion of this section, the various options on the dialog that pertain to circlecreation are explained. Following that, there is a summary of circle creation methods.

Basic Curves Dialog Options (unique for circle mode)

MultiplePositions

When this option is ON, each time you define a point, a copy of the previouslycreated circle is created, with its center at the specified point.

The String Mode option is grayed out; it is not available in circle mode.

Dialog Bar Fields

The following fields are available in the dialog bar during circle creation and editing:


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The XC, YC, and ZC fields display the location of the circle's center.

The Radius field displays the radius of the circle.

The Diameter field displays the diameter of the circle.

Simple Fillet

Creates a fillet between two coplanar nonparallel lines. You determine the size of thefillet by entering a value for the radius. The lines are automatically trimmed to the pointsof tangency with the arc.

The fillet that is created is directly related to where you select the lines. Both lines are selected atthe same time. You must position the selection ball in such a manner as to include both lines.

The trim options and Point Constructorare not available.

If the selection ball contains only one line, an error message displays.

Cannot find two lines within the selection ball radius

Both lines are selected by indicating a single point. The point determines how the fillet is created;it indicates the center of the arc. Position the center of the selection ball nearest to theintersection where you want the fillet formed. Each line extends or trims to the arc.


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2 Curve Fillet

Constructs a fillet between two curves, including points, lines, circles, conics or splines.A two curve fillet is an arc generated in the counterclockwise direction from the firstcurve to the second. The fillet created by this method is tangent to both curves.

Fillets Between Two Points

If a fillet is created between two points, it is created in a plane based on the location of the points.In the figure below, the reference plane is defined by a vector between each point (A) and the

vector parallel with the ZC axis (B). The fillet is created in the plane containing each point andnormal to the reference plane.


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If the vector between the two points is parallel to the ZC axis, the fillet cannot be

constructed.

Fillets Between One Point and Another Curve

If only one curve is a point, the fillet plane is defined as the plane which contains the vectorbetween the point and the fillet tangency point (A), and the tangent of the f illeted object (B) (seethe figure below). The fillet plane is totally independent of the WCS.

Fillets Between Two Curves

If neither curve is a point, the fillet plane is the plane that contains the tangent of the first curve.The plane is normal to the vector that is normal to both tangents. The two curves do not need tolie in the same plane and the fillet is completely independent of the WCS.


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3 Curve Fillet

This option creates a fillet between three curves, which can be any combination ofpoints, lines, arcs, conics, and splines. The Radius option is not available.

A three curve fillet is a circular arc generated in a counterclockwise direction from the first curveto the third curve. The fillet is constructed in such a way that the center of the arc is equidistant toall three curves. The three curves do not have to lie in the same plane.

The curves are trimmed to the tangent point of the fillet. If the original curve is not tangent to thefillet arc, the extrapolation of the curve necessary to intersect the fillet is calculated and displayed(except for points and splines which cannot be extrapolated).

If One Curve is an Arc

If any one of the curves selected is an arc, you are required to supply additional information tocreate the fillet:


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Tangent Outside To have the selected arc lie outside of the fillet.

Fillet Within Circle To have the fillet lie inside the selected arc.

Circle Within Fillet To have the selected arc to lie inside the fillet.

Tangent Outside

Use Tangent Outside if you wish to have the selected arc lie outside of the fillet to be created.

In the figure above, Tangent Outside was chosen after Curve 1 was selected. With automatic trim,Curve 1 is trimmed from its starting point to the point of tangency. Curve 2 is deleted; Curve 3 istrimmed to the point of tangency.

Fillet Within CircleIf you want the fillet to lie inside the selected arc, use Fillet Within Circle.


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In the figure above,Fillet Within Circle was chosen after Curve 2 was selected. This causes thefillet to lie within the selected arc. With automatic trim, Curve 2 (arc) is deleted, and Curves 1 and3 are trimmed to the points of tangency.

Circle Within Fillet

If you want the selected arc to lie inside the fillet, use Circle Within Fillet.

In the figure above, Circle Within Fillet is chosen after selecting Curves 1 and 2. This causes theselected arcs to lie within the fillet. With automatic trim, Curve 2 is deleted, and Curves 1 and 3are trimmed to their points of tangency to the fillet.

Error Messages

The following error message is displayed if the three curves you selected cannot form a fillet arc,or if the filleting procedure is unable to converge to a fillet center.

Invalid Fillet Defined

The latter occurs when the maximum allowable number of iterations (100) used to find a point oneach of the three curves that is equidistant from the indicated fillet center is exceeded. In thiscase, choosing another approximate fillet center may yield a fillet.

The following error message is displayed when the system is unable to solve the set of quadraticequations. In this case, choosing another approximate fillet center may create a fillet.

No Solution - Fillet Not Created

Basic Curves Fillets


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When you choose the Fillet option, the Curve Fillet dialog is displayed. You can use the Filletoption to "round off" the intersection between two or three selected curves. You can also specifyhow the curves are trimmed when the fillet is created.

Fillets in active sketches are created with the Sketch Fillet dialog, instead of the Curve Filletdialog that is described in this section.

Create Fillet Dialog Options

Simple Fillet Creates a fillet between two coplanar nonparallel lines.

2 Curve FilletConstructs a fillet between two curves, including points, lines, circles, conics orsplines. A two curve fillet is generated in the counterclockwise direction from thefirst selected curve to the second.

3 Curve Fillet Creates a fillet between three curves, which can be any combination of points,lines, arcs, conics, and splines.

Radius Defines the radius of the fillet.

Inherit Lets you define the values of the new fillet by selecting an existing fillet.

Trim Options If you choose to create a two or three curve fillet, you need to choose atrimming option. Trimming shortens or extends the selected curves to join withthe fillet. (Depending on the f illet option selected, some trimming options arechanged or are not available.)

PointConstructor Lets you use the Point Constructorto select some or all of the curves to fillet.

Overview

The figure below shows the three types of fillets you can create in NX.

The general procedure to create a fillet is:

1. Choose the type of fillet you want to create.
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2. Indicate how you wish to trim the objects.

3. Enter the radius of the fillet.

4. Select the objects.

5. Specify the approximate center point of the fillet.

Many of these steps are done simultaneously when creating simple f illets.There is a quick reference sheet about creating fillets at the end of this section.

You can use the Point Constructorto select one, two, or all three of the curves for a 2 curve filletor 3 curve fillet. The Point Constructorremains modal until you choose OK or Back. The figurebelow shows two examples of fillets created using the Point Constructor.

Trimming Options

If you choose to create a two or three curve fillet, you need to choose a trimming option. Trimmingshortens or extends the selected curves to join with the fillet. Depending on the fillet optionselected, some trimming options are changed or not available.

Points cannot be trimmed or extended.

Choose one of the following trim options:

Trim First CurveDelete Second CurveTrim Third Curve

In 2 Curve Fillet, you can choose to trim the first, last, or both curves. The Delete Second Curveand Trim Third Curve options are not available.

In 3 Curve Fillet, you can choose to trim the first, last, or both curves and delete the secondcurve.

If you do not select any of the trimming options, none of the curves are trimmed.

If the trimmed curve has a length equal to zero and there is no associative connection to thecurve, it is deleted.


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Define the Fillet CenterAfter selecting the curves to be rounded, indicate the approximate center point of the fillet curve.The position you select is projected normally to the first curve to help determine where the filletshould start.

Indicate the center by using the cursor or the Point Constructor. Using the cursor location methodin the Point Constructorselects a position in the X-Y plane of the WCS. This is different from thenormal method for indicating the arc center, which specifies a point in a plane parallel to theviewing screen.

Undo

After you have created a fillet and trimmed the original curves, you can choose Undo to delete thefillet and reverse the trim.

Trim Curve

Trim Curve adjusts the endpoints of curves based on bounding entities and segment(s) of curvesselected for trimming. You can trim or extend lines, arcs, conics or splines. You can trim to (or

extend to) curves, edges, planes, faces, points, or cursor locations. You can specify that thetrimmed curve is associated with its input parameters.

You can use bodies, faces, points, curves, edges, datum planes and datum axes as boundingobjects when trimming a curve. You cannot trim bodies, sheet bodies or solid bodies.

If you are trimming splines, you are warned that the defining data of the spline will bechanged. You can choose Cancel to quit or OK to continue with the trim operation.


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If you are using Trim Curve in a sketch see Trim Curve Within Sketcherfor specialoperation notes.

For simple instructions on using this option see the Basic Trim Curve Procedure.

For additional detail help and procedures see theTrim Curve Usage Tips.

For detailed field descriptions, see below.

Trim Curve Dialog Options

Selection Steps

The Selection Steps icons allow the selection of:

The First Bounding ObjectThe Second Bounding ObjectThe Vector DirectionThe String to Trim

First BoundingObject

Lets you select a string of objects from the graphics window for thefirst boundary against which the selected curves are to be trimmed.This step is required.

You can use a Filtermask to restrict the type of objects to select forthe string. Note that you cannot mix data types for bounding objects. Ifconflicting data types are selected, the previous selections aredropped.

Selecting the first boundary string highlights it in the graphics window.If the string consists of a single curve, an oval displays, marking itsStart or End point. If the string consists of multiple curves the ovalshows the start or end of the selected string of curves.

If you select a curve string nearest its end point, the oval displays itsend point, and the Trim/Extendoption changes to End. If you select a

curve string nearest its start point, the oval displays the start point,and the Trim/Extend option changes to Start. You can change theTrim/Extend option setting to suit the way you want the trim operationto work.

IfSingle Selectionis turned on, after you select the first boundarystring the system automatically activates the Second Bounding Objectselection step.

If you later select the First Bounding Object option again, the firstboundary string highlights in the graphics window.

When trimming a bounding object (that is, the Trim BoundingObjects toggle is on) with theAssociative Outputtoggle on, the stateof the bounding object follows the rules defined by theInput Curvesoption. Since under these conditions a copy of the bounding object iscreated for each string (curve) you trim, if you trim multiple strings,you are going to get multiple, associative copies of the boundingobject. You may therefore not always want to trim bounding objectswith the Associative Output toggle turned on.

Second Bounding

Lets you select a second boundary string of objects against which theselected curves will be trimmed. You can use the same methods to
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Object select the Second Bounding Object as were used for the first. If youlater select the Second Bounding Object option again, the selectedsecond boundary string is highlighted in the graphics window.

This step is optional.

When trimming a bounding object (that is, the Trim BoundingObjects toggle is on) with theAssociative Outputtoggle on, the stateof the bounding object follows the rules defined by theInput Curvesoption. Since under these conditions a copy of the bounding object iscreated for each string (curve) that you trim, if you trim multiplestrings, you will get multiple, associative copies of the boundingobject. You may therefore not always want to trim bounding objectswith the Associative Output toggle turned on.

Vector Direction

Lets you select the vector direction for the trim operation. This optionis available only whenAlong a Vectoris selected under the Method toFind Intersections option.

When the Vector Direction selection step is active, a vector selectionoption menu displays in the changeable window, to let you pick themethod to define the vector direction. Options include Plane ofCurves, Specified Vector, Specify New Vector, +XC Axis, +YC Axis,+ZC Axis and Selected Datum Axis.

If you select the Plane of Curves option, the string to trim

must be planar. The boundary object string must also beplanar and in the same plane as the string to trim.

For options other than Plane of Curves or Selected Datum

Axis, an arrow displays the defined vector direction.

String to Trim Lets you select one or more curves to trim. This step is required. Asyou select curves they are highlighted in the graphics window. If youselected aSecond Bounding Object, theTrim option becomesavailable during this selection step.

Selecting Single Curves to Trim - If you select a single curve to trim,an oval displays its Start or End point. If you selected the curvenearest its end point, the oval displays its end point, and theTrim/Extend option changes to End. If you selected the curve nearestits start point, the oval displays the start point, and the Trim/Extendoption changes to Start. You can change the Trim/Extend optionsetting to suit the way you want the trim operation to work.

Selecting Multiple Curves to Trim- If you select multiple curves totrim, the ovals that display the start or end points on the curves do not

display. Clicking Apply or OK with multiple selected curves to trimcauses two things to happen: 1) ovals displaying the ends to betrimmed display on all of the selected trim curves, and 2) a dialogopens to let you flip the ovals to the other ends of each selectedcurve, by clicking on the desired end.

If the multiple curves you select to trim form a chain of curves, thetrimming operation is performed on the string as though it were onecontinuous curve.
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Filter The Filter lets you apply a mask when you specify the types of objectsto allow for selection. Options will vary depending on the Trim Curveoperation you are in. Possible options include Any, Point, Curve,Edge, Face, Sketch, String, Plane,Datum Plane and Datum Axis. Ifyou specify Point for the filter, the Snap Point tool becomes active.Other options that can display in the Filter window include the Plane

Tool and the Vector Method.

Single Selection When on, this option automatically advances you through eachSelection Step. Upon selecting the String to Trim, an Apply isimmediately performed. When off, you must manually click eachSelection Step. You cannot have this option on and expect to selectmultiple curves.

changeable window Contains various options that appear depending on the currentSelection Step. Includes Trim/Extend, Trim,Extend and the PlaneTool.

Method to FindIntersections

Determines the method the system uses to find object intersections.Shortest 3D Distance - Trims curves to the bounding objects at theintersection marking the minimum distance measured in threedimensions.

Along Screen Normal - Trims curves to the intersection of thebounding objects as projected along the direction normal to thescreen display.

Along a Vector - Trims curves to the intersection of the boundingobjects as projected along the direction of the selected vector.

Relative to WCS - Trims curves to the intersection of the boundingobjects as projected along the ZC direction.

Use Inferred Intersection - Trims curves at the bounding objects to theclosest intersection point. Eliminates display of the Intersection Pointsdialog. If a single bounding object is selected, the pick point on thecurve being trimmed determines which intersection to use (see SingleBounding Object and Use Inferred Intersection for an example). If twobounding objects are selected, the pick point on the bounding objectsdetermines which intersection to use (see Same First and SecondBounding Object and Use Inferred Intersection for an example).

Trim Bounding Objects Turning this option on causes the system to trim not only the ends ofthe String to Trim curves, but also the bounding objects.

The portion of each bounding object that is trimmed depends on the

Trim/Extend option setting, and on where the bounding objectsintersect the curve string. An exception to this is when you haveselected the same curve for both the First Bounding Object and theSecond Bounding Object. In this case, the bounding object is trimmedas though it were a single string being trimmed to two locations (seeUsing the Same String for the First and Second Bounding Objects).

Reuse Bounding Objects Keeps bounding objects selected after an Apply has been performed,so you do not have to select them again if you want to trim additional
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strings using those same bounding objects. If this option is on, theString to Trim Selection Step is active after an Apply. This option is notavailable in the edit mode.

Spline Extension If you are trimming a spline that is to be extended to its boundingobject(s), you can choose the shape of the extension. Options are:

Natural - Extends the spline from its endpoint along the natural path ofthe spline.

Linear- Extends the spline from either endpoint to the boundingobject where the extended portion of the spline is linear.

Circular- Extends the spline from its endpoint to the bounding objectwhere the extended portion of the spline is circular.

None - No extension is performed for any type of curve.

For further details regarding the use of these options see SplineExtension.

Associative Output Lets you specify that the output trimmed curve is associative.Anassociative trim results in the creation of a TRIM_CURVE feature,which is a duplicate, associative, trimmed copy of the original curve.The font of the original curves are changed to dashed, so they aremore easily visible against the trimmed, associative copy.

Associative trimmed curves update automatically if the inputparameters change.

Input Curves Lets you specify what state you want for that portion of the inputcurves that are trimmed. Input curves consist of the String to Trimcurves, and the bounding objects if the Trim Bounding Objectstoggleis on.

Blank means the input curves are rendered no longer visible,as specified by the Edit-> Blank option. (See the GatewayHelp for a description of the Blank option.) New curves arecreated based on the output of the trim operation and areadded as new objects. Note that "blanking" occurs only at theinitial creation of the trimmed curve; subsequent updates ofthe trimmed curve have no effect on the input or boundingcurves.

Retain means the input curves are unaffected by the trim

curve operation, and are "kept" in their original state. Newcurves are created based on the output of the trim operationand are added as new objects.

Delete means the input curves are removed from the modelby the trim curve operation.

Replace means the input curves are replaced by, or

"exchanged" with, the trimmed curves. When you useReplace, features that were children of the original curvesbecome children of the trimmed curves.

IfAssociative Output is on, you can only use the Blank or Retainoptions with the input curves. The Delete and Replace options will be
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unavailable

Confirm Upon Apply Lets you preview the results and accept, reject or analyze them. Thisoption is common to Selection Steps dialogs.

Basic Trim Curve Procedure

The basic procedure to trim (or extend) a curve is shown in the following steps.

1. Use the First Bounding Objectselection step to specify the first bounding object. If youwant to trim or extend the bounding object, turn onTrim Bounding Objects and set theTrim/Extendoption to either Start or End.

2. Select the second bounding object (optional). If you have already turned on TrimBounding Objects for the first bounding object, the second bounding object is also goingto be trimmed. You can independently set the Trim/Extendoption for the secondbounding object to Start or End.

3. Set the desired Method to Find Intersections option.

4. Use the String to Trim selection step to specify one or more curves you wish to trim or

extend. The ends of the curves you select indicate the ends that will be trimmed.5. Set theExtend and Trimoptions for the selected curve.

6. If you chose Along a Vector for the Method to Find Intersections option, use the VectorDirectionselection step to specify the desired direction of the trim.

7. Turn on theAssociative Output option if you want the output trimmed curve to beassociative with its input parameters.

8. Use the Input Curves pull-down menu to specify the disposition of the curves to betrimmed.

9. Click OK or Apply.

The curve is trimmed or extended.

Trim Curve Usage Tips

For additional help or procedures see the following Trim Curve Usage Tips.

Bounding Objects

Extending and Projecting Curves

Trimming Circles

Indicating Intersection Points

Trim and Extend Options

Trim and extend options affect both bounding objects and curve strings selected for trimming.

Trim and Extend Options
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Trim/Extend When either the First or Second Bounding Object selection step is active and youhave selected a bounding object for that step, the Trim/Extend option becomesavailable. Use Trim/Extend to specify which end of the bounding string is to betrimmed or extended. Even if the bounding object is not being trimmed (that is,TrimBounding Objectsis off), this setting still controls which end of the bounding objectis extended to get an intersection with the String to Trim.

To trim or extend a bounding object, theTrim Bounding Objects option mustbe on.

This option is also available when only one bounding object is specified, anddetermines which end of the string is trimmed away or extended to the boundingobject.

Start - For bounding objects, trims or extends the bounding string from its startpoint to the trim object. A small oval displays the start point of the bounding objectstring. For string to trim objects with only one bounding object specified, trims orextends the string from its start point to the bounding object.

End - Trims or extends the bounding string from its end point to the trim object. Asmall oval displays the end point of the bounding object string. For string to trimobjects with only one bounding object specified, trims or extends the string from itsend point to the bounding object.

If you select the same bounding string for the First Bounding Object and theSecond Bounding Object, and if theTrim Bounding Objects toggle button is on, thebounding string is trimmed as though it were a single string being trimmed to twolocations. For details see Using the Same String for the First and Second BoundingObjects.

Extend When the String to Trim Selection Step is active, and both a first and secondbounding object have been specified, Extend is a separate option that lets you

specify which end of the string is to be extended to the first bounding object. Theother end of the string is extended to the second bounding object.

Start - Extends the curve string from its start point to the first bounding object. Theother end of the string is extended to the second bounding object.

End - Extends the curve string from its end point to the first bounding object. Theother end of the string is extended to the second bounding object.

The end of the curve string you select, either its start or end, controls the initialsetting of this option. For example, if you select the part of a curve that is closest toits starting end, Start is automatically set. You can change the setting by choosingeither Start or End.

Trim When the String to Trim Selection Step is active, and both a first and second

bounding object have been specified, Trim is a separate option that lets you specifyone of the following:

Outside - trims away the portion of the curve string that lies outside of thebounding objects.

Inside - trims away the portion of the curve string that lies inside or between thebounding objects.

Spline Extension
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When you extend a spline, you can define the extension as:

Natural Extends the spline from its endpoint along the natural path of the spline.

Linear Extends the spline from either endpoint to the bounding object where the extendedportion of the spline is linear.

Circular Extends the spline from its endpoint to the bounding object where the extended portionof the spline is circular.

None No extension is performed for any type of curve. See Trimming Two Portions of a SingleCircle for an application example using this option.

Linearlets you extend a spline from either endpoint to the bounding object where the extendedportion of the spline is linear. The slope of the extension line is equal to the slope of the curve atits endpoint.

Circularlets you extend a spline from its endpoint to the bounding object where the extendedportion of the spline is circular. The circle lies in the plane of the tangent and normal at theendpoint of the curve. The center is along the normal line at the endpoints. The radius of thecircle is the radius of curvature at the endpoint. (See the figure below.) The curvature of a curve isthe inverse of the radius of curvature.

If the curve is not a spline and you are not using the None option, the Natural extensionshape is used.

If the extension of a spline does not result in a true intersection, then the spline will not beextended and the trim will occur at the minimum distance to the original spline.

If you are trimming a nonperiodic spline using two bounding objects, both ends are extended (ifnecessary) to intersect the bounding objects, and the portion between the bounding objects iskept after trimming. If no extension is needed, the portion containing the selected point is thrownout.

Indicating Intersection Points

With some trim curve operations, there may be multiple intersection points between the selectedcurve and the bounding objects. If this is the case, and to assure that the trim is calculated usingthe correct intersection point, a separate selection steps dialog may display during the trimprocess after you have clicked OK or Apply (see next figure).
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Along with this dialog, the system displays possible intersection points in the graphics window foryou to select. If only one string of bounding objects is specified, you are only prompted for asingle intersection point. If there are two bounding objects you may be prompted for a secondintersection point.

Select the desired intersection point and click OK. The trim operation then proceeds.

Trimming Circles

When trimming circles using a single bounding object, they trim back from the endpoint of thecurve, as shown in the figure below.

When you select a circle, an oval displays the location of its endpoint.

Trimming Two Portions of a Single Circle

Setting theSpline Extension option to None enables you to trim out two separate portions of asingle circle. Setting Spline Extension to any of its other options (that is, Natural, Linear orCircular) treats arcs to be trimmed as though they are full circles. In order to override thisbehavior, set the Spline Extension option to None.
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To trim out the first side of the circle, position the cursor to select the bounding objects near oneset of intersections (make sure Use Inferred Intersectionis on). Before you attempt to trim out theother side you will have to set the Spline Extension option to None.

This first trim will give you the result shown below.

Now set the Spline Extension option to None and select the string to trim as shown above. ClickOK or Apply and you should get the results shown in the next figure.
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Edit Curve All

The options under Edit-> Curve-> let you modify existing non-associative curves.

You can edit a number of curve types using a Selection Steps dialog similar to the one that wasused to create them. The creation and editing of these types of curves is covered in the samesection of the documentation (for example, see Offset Curve and Wrap/Unwrap Curve).

The Edit-> Curve-> All option opens a dialog with all non-associative edit curve functions.

Edit Curve (All) Dialog Options For Non-Associative Curves

Edit Curve Parameters - Lets you edit the parameters (that is, the defining data) ofmost types of curves.

Trim Curve - Adjusts the endpoints of curves (lines, arcs, conics, or splines) basedon the bounding entities selected (curves, edges, planes, faces, points, or cursorlocations) and the segment(s) of curve selected for trimming.

Trim Corner- Trims two curves to their intersection point, thereby forming a corner.

Divide Curve - Divides a curve into a series of like segments.

Edit Fillet - Lets you edit existing fillets.

Stretch Curve - Lets you move geometric objects, while simultaneously stretchingor shrinking selected lines.
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Edit Arc Length - Trims a curve by a given arc length increment, or to a total arclength.

Smooth Spline - to automatically remove imperfections in the curvature propertiesof a B-spline.

Point Method Used to change the position of a line endpoint. The Point Method options let youspecify points relative to existing geometry, or by specifying a cursor location orusing the Point Constructor. In some cases, you will use the Snap Point toolinstead of the Point Method options.

EditArc/Circle By

You can edit an arc or circle two ways: by editing itsParameters, or by Draggingit.

ComplementArc

Lets you create the complement of an existing arc.

Display

OriginalSpline

If you are editing a spline, this option lets you display the original spline for

comparison during the editing.

EditAssociativeCurve

By Parameter lets you edit an associative curve while preserving its associativity.

As Original breaks the associativity between the curve and its original defining data(you receive a warning).

Arc LengthTrim Method

Total - Use this method to trim a curve by its total arc length. Total arc length is thedistance from the start of a curve to the end of the curve, following the exact pathof the curve.

Incremental - Use this method to trim a curve by a given arc length increment. Thearc length increment is the length used to trim from the original curve.

This option is also found underEdit Arc Length.

Arc Length Lets you enter a value for the length of the trimmed or extended arc. This option isalso found underEdit Arc Length.

Update Use this option to update your model after making edits to curves, without exitingthe Edit Curve dialog.

Click on the following topics for additional information for editing non-associative curves:

Editing a Line

Editing an Arc or Circle

Editing an Ellipse

Editing a Spline

Use Edit-> Transform to change the location of an associative or non-associative curve. (See theGateway Help for more information on Transform.) However, some functions, such as copy,remove the relationship between a dependent curve and its associated geometry. In many cases,you are warned if a transformation would have this effect. For cases like a copy operation orcircular/rectangular instance arrays, no warnings are issued.
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Editing Associative Curves

To edit associative (feature) curves, select the curve in one of the following places:

The graphics window, followed by MB3-> Edit Parameters

The Part Navigator, followed by MB3-> Edit Parameters

The Edit-> Feature dialog listing

All of these actions opens the dialog you used to create the associative curve, which you canthen use to modify the curve.

For more information on associative curves, see the Associative Line,Associative Arc/Circle,Lines and Arcs, Studio Spline,Mirror Curve andPointtopics.

Basic Curves Creation Tools

The Dialog Bar

The dialog bar is a series of data entry fields that appear at the bottom of the graphics window,just to the right of the work layer input box, when the Basic Curves dialog is active. The data entryfields in the dialog bar vary depending on which type of curve you are creating, and which optionsyou have selected. For example, this is what the dialog bar looks like when you are creating lines.

There are two types of data entry fields in the dialog bar:

Locationfields - XC, YC, and ZC. These fields track the location of the cursor, or you can

use them to input a fixed value.

Parameter fields - These fields control parameters of the curve, such as length of a line,

or radius of an arc.

There are also two options on the User Interface Preferences dialog (described in the NXGateway Online Help), in the Dialog Bar Options area, that affect dialog bar interactions:

Decimal Places - This controls the number of decimal places displayed in the fields.

Tracking - This controls whether or not the fields track the current location of the cursor.

To give a text field focus, you can use the key or click MB1 in the field you want (once for"insert" mode, twice for "replace" mode), as with any other Motif text field. (For more informationon text fields, see the NX Gateway Help.)

Here are the general rules that apply to keying in text in the dialog bar fields:

When the XC, YC, or ZC field has focus, and you press , the location you have

specified is accepted and an asterisk is displayed in the graphics area indicating thatpoint.
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When a parameter field (such as length, radius, etc. - any field other than the three

mentioned above) has focus and you press , the values in all parameter fields areaccepted and applied to the curve being constructed.

As soon as you finish creating a line, arc, or circle, you can enter new values in the

parameter text fields and the newly created object will be updated accordingly (unlessyou are using String Mode).

The content and function of the fields are discussed in the individual curve creation sections.

Preview of Object Creation

As you go through the steps to create a line, arc, or circle, in most cases you will see a "preview"of what the new curve will be, so that you know what the curve will look like before you create it.You can also change some of the parameters of a curve right afteryou create it.

When you are creating a curve in the Basic Curves dialog, all curves other than fillets are createdwith some type ofdraggingmethod. The shape of the curve ispreviewed, i.e., you see what thecurve will look like, as you are dragging it, before it is actually created. When the curve lookscorrect, you can accept it by completing selection of the currently highlighted geometry orindicating a screen location.

Shift/MB3 Popup Menus

When you are in line, arc, or circle creation mode in the Basic Curves dialog, there is a specialpopup menu you can use. To display this menu, move the cursor to the graphics window andpress MB3.

This popup menu changes depending on what type of curve you are creating. The figure belowshows what the popup looks like when you are creating lines and arcs. (When you are creatingcircles, the top two options are not displayed.)

Basic Curves Point Method Creation Option


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This option menu lets you specify points relative to existing geometry, or by specifying a cursorlocation, or by using the Point Constructor. The options on this menu (shown below), except forInferred Point and Select Face, work similarly to those in the Point Constructor.

Inferred Point Intersection Point

Cursor Location Arc/Ellipse/Sphere Center

Existing Point Quadrant Point

End Point Select Face

Control Point Point Constructor

Inferred Point

The Inferred Point method affects the following points:

Cursor locations Control points (end point, midpoint, existing point)

Arc centers

The type of point currently selected is displayed in the Status line. As you move the cursor aroundthe graphics area, objects, control points, and arc centers are prehighlighted to help you selectthem.

See the Snap Point Tool for specific types of point inferencing methods that are

available when specifying points and point locations during the creation andediting of certain geometric objects.

When you use an option other thanInferred Point, several things change:

The cursor location is no longer tracked in the dialog bar.

Control points are no longer highlighted.

The snap angle is ignored.

Select Face

The Select Face option lets you select a face and use it as the limiting object for a line. Thisoption is grayed out when you are in any other curve creation mode. After you select a face, youare automatically returned to Infer mode.

If you choose the Point Constructor method, the Point Constructoris displayed. When youchoose OK or Back from that dialog, you are returned to the Basic Curves dialog.
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Documents

Basic Curves