GdT Pcdmis Training Manual _Issue 1

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GD & T PCDMISTrainingManual


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2 GD & T PCDMIS Issue 1 May 2006

INDEX

Chapter

1. Course Introduction..IntroductionHexagon quality assurance documentation

AgendaCourse objectives

2. Datum DefinitionsPrimary DatumSecondary DatumTertiary Datum

3. Tolerancing with PCDMISGD & T Dialog boxFeature Control FrameHow to apply a Tolerance

4. Form TolerancesCircularityStraightnessFlatnessCylindricity

5. Location TolerancesLocation

Regardless of Feature sizeMaximum Material ConditionConcentricity/CoaxialitySymmetry

6. Orientation Tolerances.ParallelismPerpendicularity

Angularity

7. Profile Tolerances.Profile of a line

Profile of a surface

8. Runout Tolerances..Circular RunoutTotal Runout

9. AppendixSet up options TolerancingFeature Control frameLocationTrue positionProfileGD & T Advanced TabComposite Tolerances


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Course Introduction

IN THIS CHAPTER

11

Introduction

Hexagon quality assurancedocumentation

Agenda

Course objectives


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Introduction to PC-DMIS GD & T Training Course

Welcome to Hexagon Metrology

Hexagon metrology welcomes you today to their metrology facility andhopes that your visit will be enjoyable, interesting and informative.During the introduction session we respectively request that you takenote of any health and safety requirements and that you complete theHexagon Metrology quality assurance documentation.

The information provided will contribute to future development of bothexisting and new training courses.

Introduction Overview

Welcome

Introduction to Hexagon Metrology

Health & Safety

Course subsistence arrangements

Course Content and Times

Trainee registration and background

Training manual contents

Workbook principals

Evaluation

Certification

Further courses


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Course AgendaPlease see the following overview of the course agenda

GD & T with PCDMIS Datum Reference Systems Form Location Orientation Runout Profile

Please note: Course content and order is subject to change at the discretionof the Training Instructor

Course Objectives

To achieve a Basic understanding of Geometric Dimensioning and Tolerancing (GD& T) with PCDMIS in the following areas:

Datum Systems

Form

Location

Orientation

Runout

Profile

Training Manual and workbookEach trainee will be provided with a training manual and workbook covering differentaspects of the level 1 course only

What this training manual is!The training manual is provided as a reminder to each student of the importantrequirements that lead to the successful implementation of GD & T functions withPCDMIS. It provides basic examples and techniques on the GD & T functions of PC-DMIS.

What this training manual is not!It is not another version of the technical manual.

What is the workbook?The workbook provides evidence of competence achieved by each trainee duringthe training course. It will include exercises to check that learning has taken place notonly in the use of the tolerancing on the CMM but also the knowledge andunderstanding gained.


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EvaluationAs we all know evaluation is very important. The workbook will provide a method ofevaluating each trainees competence and give the trainee evidence to take back forthemselves and their employer of their achievements during the course.

Based on the results obtained and evaluated by your training instructor, a certificatewill be issued. The assessment of competence can only be judged at the time of thecourse. This does not mean that the trainee can be classed as an expert, it isimportant for the trainees to implement the techniques they have learned on theirreturn to their respective company.

Course evaluationHexagon metrology takes pride in the services it provides and continues to strive toimprove this quality service. It is important for us to getfeedbackabout our services.

As part of this process, we will kindly request that on completion of your course you

complete atraining evaluation form.

During each session of the course the students will be encouraged to participate inboth the theoretical and practical elements.

Questions and answers sessions for the above elements and any other requirementswill be included as requested.


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Datum Definitions

IN THIS CHAPTER

22Datum reference system


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Datum Reference System (Alignment/Co-ordinate system)

Knowledge of component alignments is a requirement to successfully achieve thedatum reference system requirements of Geometric dimensioning and tolerancing

(GD & T)

ThePrimary Datumcan be defined by a minimum of 3 point contact on a surfaceor by the generation of a 3D Axis through a minimum of 2 features.(LEVEL)

TheSecondary Datumcan be defined from a minimum of 2 points, of an edge orthrough an axis relative to the Primary datum(ROTATE)

TheTertiary Datumcan be defined by a minimum of one point in relation to thePrimary and secondary datums(ORIGIN)

Note The above is achieved by the successful implementation of thealignment routines available within PCDMIS as previously shown andassessed on both the PCDMIS Level 1 and Level 2 courses


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Tolerancing with

PCDMIS

IN THIS CHAPTER

33

GD & T Dialog box Feature Control Frame How to apply a Tolerance


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GD&T Dialog Box - Feature Control Frame tab

The Feature Control Frame tab gives helps you construct a Feature Control Frame

(FCF). It provides you with the tools to define datum features, select the featuresused in the FCF dimension, an editor to define the specific symbols, tolerances, anddatums used in your FCF, and a preview area to see the current state of the FCF asyou build it. For information on the various items in this tab, see the list of controlsbelow:

ID This box displays the name for the FCF. You can edit it if you want somethingdifferent.

Features This list displays available features for the particular FCF type. Somefeatures may exist in the part program, but are not available to the feature controlframe. For example, a plane feature is not available to Circularity. PC-DMIS updatesthis list after you select the first feature. This ensures that when you create a patternof features for the FCF, those features are compatible features.

Datums The shows all the datums defined with DATDEF commands. It only listsdatum features above the current cursor position in the Edit window.

Leader Lines This list shows the same features that you selected from theFeatures list. Each feature has a check box associated with it. When you select acheck box, PC-DMIS draws a leader line in the Graphics Display window from the

FCF to that feature. By default, PC-DMIS initially displays all possible leader lines,but you can clear check boxes to turn off leader lines as well.

Feature Control Frame Editor This area lets you apply changes to the FCF. Youcan select fields with the mouse or by pressing TAB and then ENTER to place thefield into edit mode. If the field is editable, it will either display a drop-down list ofavailable options, or it will display a box into which you can type text. When finishedediting a field, press ENTER, TAB, or click on a different field to exit the edit mode.Pressing SHIFT + TAB will move backwards to the previous field.

When a field is empty a short description is displayed with brackets around it for

identification. These descriptions correspond to these fields:

- Material condition - Diameter - Dimension or feature control frame type - Projected zone - Number of features - Nominal of feature size - Plus tolerance - Minus tolerance - Tolerance - Datum - Dimension symbol


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- Note field in the first line - Optional design notes in the last line

Planar Zone -This button appears in the Feature Control Frame Editor area of thistab, if you have a True Position FCF and the tolerance zone is set to a planar zone.

To enable this button, select the diameter symbol from the FCF editor and set it toblank as shown here:

Once the Planar Zone button appears, you can click it to open the Planar ZoneDirection dialog box.

The Planar Zone Direction dialog box lets you specify the direction vector for theplanar zone in one of two ways:

Select the Axis option. Then from the Axis list, select an axis fromthe list: X, Y, or Z.

Select the Vector option. Then in the I, J, and K boxes, type thedirection vector.

Datum Definitions This button provides you with easy access to the DatumDefinitions dialog box, allowing you to define datums for your current FCF dimension.

Feature Control Frame Options This area contains the Composite check box.This check box controls whether or not the primary dimension row and secondarydimension row should use the same symbol in a single merged cell that spans bothrows.(See Appendix)

If you clear the check box, the primary and secondary rows display with separatesymbols, even if the symbol represents the same thing.

Actions and Procedures This section displays hints and instructions to assist youin building valid FCFs.

Preview This section displays a preview of the FCF with the current settings. It willnot include any of the empty fields or empty descriptions that appear in the FeatureControl Frame Editor section, for example fields that have brackets, such as .

Notes on the Feature Control Frame Editor

In the Feature Control Frame Editor area be aware that some of the icon fields, ifthey are not supported will not appear for certain dimensions. For example, if youhave Circularity dimension, PC-DMIS displays the tolerance field, but hides anydatum or modifier fields.

Form dimensions(Circularity, Straightness, Cylindricity, Flatness) - These don'tsupport datums or modifies, so these fields will not appear. Profile in some cases willfall in this category when checking for "Form only". But "Form and Location" forProfile dimensions allows the display of modifiers.


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Orientation dimensions(Parallelism, Perpendicularity, Angularity, Runout,Concentricity, Coaxiality) - These allow datums and modifiers.

Position dimensions(True Position, Profile with Form and Location) - These allowdatums and modifiers.

Other dimensions(Distance and Angle Between) - These don't allow datums.Symmetry is a lot like the form dimensions, and doesn't use datums

Also, only these dimensions can have multiple lines in the editor:

True Position Parallelism Perpendicularity

How to apply a tolerance to a feature

To apply a tolerance to a feature the options are available in PCDMIS through thedimension section. Firstly measure the feature, then choose the tolerance functionrequired.

Lets look at an example of tolerancing a circle in the Z plus working plane for isdiameter and location

Measure the circle with the numbers of hits required

Insert dimension - location

Tick the boxes X, Y, DInput the tolerance, 0.100

Plus 0.100Minus 0.100

The minus sign is only used if the outputin the dimension parameters is changedto signed

CreateClose

The nominal values would now require to be entered in the edit window for eachdimension if the circle is measured directly on the component. If the nominal data isobtained prior to measurement using autofeatures or CAD then the nominal valuesshould be already set


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Form Tolerances

IN THIS CHAPTER

44

Circularity Straightness Flatness Cylindricity


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Circularity

Circularity also known as Roundness in this example the shape of thediameter to be produced and measured should be round within a tolerance zone

of 0.025

The tolerance is specified by a zonebounded by two concentric circles

If legacy dimensioning is activated then figure 1 will appear ready for thetolerance requirements to be inserted. Alternatively if legacy dimensioning is notactive then figure 2 will appear ready for the tolerance requirements to be inserted

Measure requiredcirclefeature SelectCircularityfrom the

dimension section Select feature(cir1) (1) Change featurelabelif required

(2)(datum diameter) Inserttolerance (3) (0.025) Set outputs with advanced tab

(See appendix for full details) Create

0.025

Figure 1 Figure 2

12

3


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Straightness

Straightness can be defined as the maximum allowable deviation away from astraight line or axis within the tolerance zone

Measure requiredLinefeature Select Straightnessfrom the

dimension section Select feature (lin1)

Insert required tolerance(0.1) Change label(optional)(Angled

Edge) Create


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Flatness

Flatness can be defined as the maximum allowable deviation on a surface within

the tolerance zone

Measure requiredPlanefeature

SelectFlatnessfrom the dimension section Select feature(pln1) Insert required tolerance(0.1) Change label(optional) Create


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Cylindricity

Cylindricity can be defined as the maximum allowable deviation of all points on asurface of revolution equi distant from a common axis within the a tolerance zone

defined by two cylinders

Measure requiredCylinderfeature SelectCylindricityfrom the dimension

section Select feature(cyl1) Insert required tolerance(0.1) Change label(optional) Create

0.025

0.010


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Form Tolerances applied as feature control frames to the graphical window


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Location Tolerances

(True Position)

IN THIS CHAPTER

55

True Position Regardless of Feature size Maximum Material Condition Concentricity/Coaxiality Symmetry


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True PositionLocation tolerances are also known as true positional tolerances. Either definedas a cylindrical zone or parallelepiped (Boxed/rectangular)

Measure requiredCirclefeature

Regardless of feature size (RFS)

SelectTrue positionfrom thedimension section

SelectDatum definitionoptionand define required datums

A,B,C

Select feature(cir1) Insert required tolerance

(0.25) Insert diameter tolerance

(15.000 0.025) Insertcylindrical zone modifier Select datumsABC Change label(optional) Create


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MMC on actual feature Repeat previousRFS

processand selectMmodifier next to tolerance

MMC on Datum feature Repeat previousRFS process

and selectMmodifier next toDatum C

MMC on both Actual and Datumfeatures Repeat previousRFS process

and selectMmodifier next totolerance and next to Datum C


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True Position tolerances applied as feature control frames to the graphicalwindow


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Concentricity or Co-axiality

PCDMIS uses different symbols to define Concentricity and Coaxiality. All sectionalfeatures taken are defined as being common to the datum axis feature. As a simpleexplanation of the difference consider the geometric elements circle and cylinder,

these can be defined as two dimensional and three dimensional features.

Measure requiredCircle orCylinder feature or features

SelectConcentricity orCoaxialityfrom the dimensionsection

Select Datum definition optionand define required datums

A,B,C (if not alreadycompleted)

Select feature(CIR1) Select datum if not main in

Primary datum set Insert required tolerance

(0.01) (0.025) Selectdatum C Change label(optional) Create

Concentricity

Co-axiality


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Symmetry

Symmetry also known the middle off or equal/equal about the centre. In the examplethe tolerance is applied to the median plane created by the two inside surfaces of theslot to datum A created from the median plane of the two out side surfaces

Measure requiredLine feature orfeatures

SelectSymmetryfrom thedimension section

Select Datum definition option anddefine required datums A,B,C (ifnot already completed)

Select feature Select datum if not main in main

datum set(Lin5) Insert required tolerance(0.01) Selectdatum B Change label(optional) Create


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Concentricity and Coaxiality Tolerances applied as feature control frames tothe graphical window (orientation tolerances also shown in this view)


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OrientationTolerances

IN THIS CHAPTER

66

Parallelism Perpendicularity Angularity


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Parallelism

Parallelism can be defined in many ways whether applied to an axis or asurface

Measure required feature or features(lines in this example)

SelectParallelismfrom thedimension section


A,B,C (if not already completed) Select feature/s(Lin2/Lin1..this

order of selection) Select datum if not main in

primary datum set Insert required tolerance(0.2) Change label(optional) Create

0.200


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Perpendicularity

Perpendicularity can be defined in many ways as shown below, whetherapplied to an axis or a surface

Measure requiredCylinderfeature or features

SelectPerpendicularityfromthe dimension section


A,B,C (if not alreadycompleted)

Select feature(Cyl1) Select datum if not main in

main datum set Insert required tolerance(0.2) Insert diameter tolerance

(15.000 0.025) Selectdatum A Change label(optional)(Cyl1) Create


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Angularity

Angularity is a method of checking the deviation of a surface or an axis at a

specified angle

Measure requiredLinefeature or features SelectAngularityfrom the dimension

section Select Datum definition option and

define required datums A,B,C (if notalready completed)

Select feature(Lin2) Select datum if not main in Primary

datum set Insert required tolerance(0.2) Insertcylindrical zone modifier Selectdatums AB Change label(optional)(slot edge) Create


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Orientation Tolerances applied as feature control frames to the graphicalwindow (Concentricity and Coaxiality also shown in this image)


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Profile

IN THIS CHAPTER

77

Profile of a line Profile of a surface


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Profile

Profile tolerances fall into two main categories

Profile of a Line

Profile of a surface

These tolerances are normally applied to irregular or normal edges, surfaces or,arcs. The tolerance can be applied either side of the nominal profile (Bi-lateral) orto one side (unilateral) only. The uniform boundary can be applied relative to theprofile only or alternatively can be applied relative to the datum reference systemas well as the profile.

Profile of a Line

Measure required

Linear Open Scanfeature or features SelectProfile Of A

Linefrom thedimension section

SelectDatumdefinition optionanddefine requireddatums A,B,C (if notalready completed)

Select feature

(SCN1) Selectdatumif not main in Primary datum set SelectForm onlyorForm and location Insert required tolerance(0.050) Select datums ABC(Form and location only) Change label(optional) Create


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Form only and Form and location tolerance options applied within thegraphics display window

FromInsert - ReportCommand - Analysisthe option to create an

analysis view set withvarious dimensionoptions is available forinsertion into a Report(Use F1 help key inPCDMIS for moreinformation)


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Profile of a Surface

Measure requiredPatch Scanfeature or features

SelectProfile Of A Surfacefrom the dimension section

SelectDatum definition optionand define required datums

A,B,C (if not already completed) Select feature(SCN2) Selectdatumif not main in

Primary datum set SelectForm onlyorForm and

location Insert required tolerance

(0.050) Select datums ABC(Form and

location only) Change label(optional) Create

Form Only

Form and Location


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Form only and Form and location tolerance options applied within thegraphics display window

FromInsert - Report Command - Analysis the option to create an analysis viewset with various dimension options is available for insertion into a Report (Use F1help key in PCDMIS for more information)


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Runout Tolerances

IN THIS CHAPTER

88

Circular Runout

Total Runout


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RunoutRunout is applied to control any circular feature surfaces rotated through 360degrees. This could apply to a diameter or a surface at any position across that

surface of revolution.Circular runout is applied the surface around the datum axis, included within thetolerance are any effects of concentricity and circularity.

Circular Runout Measure requiredCylinder

feature or features SelectRunout - Circularfrom

the dimension section SelectDatum definition option

and define required datums

A,B,C (if not already completed) Select feature/s(cyl1/cyl2) Selectdatumif not main in


(0.050) Select datumD Change label(optional) Create


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Total Runout

Total Runout controls the surfaces around the axis of 360 degrees revolution. Thedifference from runout is that this tolerance is applied across the complete surfaceas one tolerance. As a composite tolerance total runout includes the effects of

circularity, Cylindricity, concentricity Coaxiality Perpendicularity, Parallelism, andFlatness

Total runout applied to a Plane surface around an axis of revolution


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Plane to Cylinder Measure requiredCylinder and

planefeatures SelectRunout Total Runout

from the dimension section

SelectDatum definition optionand define required datums

A,B,C (if not already completed) Select feature/s(cyl2/pln1) Selectdatumif not main in


(0.050) Select datumD(if required) Change label(optional) Create

Cylinder to Cylinder Measure requiredCylinder and

planefeatures SelectRunout Total Runoutfrom

the dimension section SelectDatum definition optionand

define required datums A,B,C (ifnot already completed)

Select feature/s(cyl1/cyl2) Selectdatumif not main in Primary

datum set Insert required tolerance(0.050) Select datumD(if required) Change label(optional) Create


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APPENDIX

IN THIS CHAPTER

99

Set up options Tolerancing Feature Control frame Location True position Profile GD & T Advanced Tab Composite Tolerances


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Setup OptionsThis is located by either selecting Edit Preferences Setup - Dimension from themain menu or by using the shortcut key F5 Dimension. These options allow thedimension outputs to be set to the users requirements.

Some of the main options include

Decimal places Standard tolerances Positive reporting only(no minus

values entered All data reported or errors only Angles in degrees minute seconds or

degrees decimal Polar angular output as 0-360 or 0-

180

The dimension can also be set toautomatically be created.

This dialog box provides you with several optionsthat allow you to determine whether or not PC-DMIS automatically dimensions featuresimmediately after creating them and how itshould create those dimensions.


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Tolerancing

The tolerancing options inPCDMIScan be of many different types. The tolerancescan be standard bilateral values or alternatively unilateral values including theimplementation of geometric tolerancing. It is also possible to use the limits and fits

options where interference, clearance or transition fit requirements are stated on thetechnical drawing or CAD model.

All these options are available through the dimensioning menu located from the insertcolumn on the main PCDMIS screen.

Adding Dimensions

Overview - DimensionsOnce a feature or series of features has beenmeasured, it will be necessary to dimension

them and apply nominal and toleranceinformation.

Features can be dimensioned just after they aremeasured or later in the program, the choice isyours.

Whenever you wish to access the dimensionfunction, selectDimensionfrom the mainmenu. A drop down list appears containing theavailable options. Select the relevant dimension

type and a dialog box will appear containing thevarious options available for that dimension.

There are various options which are common to all of the dimension types, we willuse theLocationoption as our example when discussing these.

The dialog box contains all of the options related to the particular dimension,including which axes to display, which tolerance to apply and where to send the dataonce it is calculated.

The dialog box is broken down into individual elements or frames which containrelated options, to select an option click in the check box next to the option.

TheID boxdisplays the dimension IDthat will be assigned to the reporteddimension.

TheSearch IDbox allows you to lookfor a particular feature in the featurelist.

TheSelect Last #box allows you toselect the last "n" features as thefeatures to be reported.


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TheUnitsoption allows you to report dimensions in the units of choice, whicheverUnits are selected at the time thatCreateis clicked will be the units applied to thatdimension.This option therefore allows you to mix and match the reported units of

measurement.

TheFeature Listlocated at the left side of the dialog box allows you to select thefeature or features that will be reported.

Once a feature has been selected, theAxesoption allows you to select which axis oraxes are to be reported.

TheTolerancesoption will change depending on the type of dimension selected, butthis is where the amount of tolerance to be applied is input.

TheDimension Infooption allows you to modify the individual elements of agraphical report which is attached to the feature as shown on the screen. This displaycan be edited using the Edit button.

TheOutputTo option allows you to define where to send the reported information.

TheAnalysisoption allows you to select the type of analysis to be performed on thereported data.

The remaining options are specific to the Dimension type selected and are discussedthere.

LocationWhat is a Location Tolerance?

A location tolerance is also known as plus - minus tolerancing or limit tolerancing. Itinvolves defining the features nominal size and position along with a positivetolerance and or a negative tolerance.

This method gives a square or rectangular tolerance zone as opposed to the TruePosition method which gives a circular tolerance zone.


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To access the Location option selectInsert, Dimensionfrom the main menu andthen selectLocationfrom the drop down list of options.

This will display the Feature Location dialog box shown below which is where thevarious options for the reported dimension are selected.

As theLocationoption is used for various feature types, there are several outputoptions included in the dialog box to make it conform to the various standards aroundthe world.

For a basic Location dimension the following steps are required

1. Assign a dimension name or accept the default ID.

2. Select the features to which the dimension will be applied by highlighting them

in the Feature List.

3. Check the axes to be reported in theAxesoptions by clicking on the box next

to the required axis or axes.

4. If the tolerance is the same for all axes, make sure thatALLis selected in the

Tolerancesoption and enter a value for the plus and minus tolerances.

5. Decide whichUnitsthe dimension will be reported in, Inches or Millimetres.

6. Decide where you want the output to be sent to by selecting the appropriate

option in theOutput Tooptions.

7. Click on theCreatebutton to generate the report.

The Sheet Metal Axes options allow you to add addition outputs to your report whichare peculiar to sheet metal applications.

The Location Options add further outputs when dealing with Vector Points, SurfacePoints and Edge Points.

Some European applications require that theISO Limits and Fitsbe incorporatedinto the location calculation and so this option is included.


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True Position input options

If within the Insert Dimension section, the use legacy dimensions option is activatedthen figure 3 is the menu screen for true position and all other dimensions if inactivethen the menu screen is as shown in figure 2

Figure 3

Figure 4

Figure 1

Figure 2

When using this option to create a feature control frame, set up the datums via thedatum definitions button in the dimension menu or in this window before selecting the

required tolerances. In this example Datum A (plane) Datum B (Line) Datum C(Circle)


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Dimensioning a profile

The profile'sSurfaceoption computes the three-dimensional profile error of a surfaceor curve feature Insert - Dimension - Profile Surface

The profile'sLine menuoption computes the two-dimensional profile error of a curveInsert - Dimension - Profile - Line

Profile of a line

Edge profile= PROFILE OF LINE OF SET LINEAROPENFORMONLY LEAST SQUARES ABOUT ZPLUS UNITS=MM ,$GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTHAX NOMINAL MEAS +TOL -TOL DEVOUTTOLM 0.000 0.000 0.050 0.000 0.000 0.000 #--------

Legacy Dimensioning

Feature Control Frame


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GD&T Dialog Box - Advanced tab

The Advanced tab provides you with

the ability to set output and analysisoptions for your Feature ControlFrame (FCF) dimensions. Fordocumentation on this tab, see thelist of dialog box items discussedbelow. Also, note that much of thisfunctionality already exists in thelegacy dimensions

Output Area -TheReport and

Statisticslist allows the featurecontrol frame output to be printed toeither the inspection report or tostatistical files used by statisticssoftware (such as DataPage), toboth of these, or to none at all.

Statistics sends output to statistical files Report sends output to inspection report Both sends output to both inspection report and statistical files None doesnt send output anywhere

When PC-DMIS executes a FCF command, the output will go to the inspectionreport, the stats file, both of these, or none of them, depending on what you selected.

Note: If either theStatsoption or theBothoption is selected, a precedingSTATS/ON command must existinside the Edit window for the FCF to be sent to thestats file.

TheUnitslist allows you to determine the units of measurement your FCF shoulduse. You can choose between these options:

Inch= Inches MM= Millimetres

PC-DMIS uses the selected unit of measurement for dimensioning as long as thedialog box remains open. By default, PC-DMIS uses the same unit of measurementused by the current part program.

Analysis area -This area sets the dimensional output analysis format for the FCF.


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Report Textual Analysis -When you select on (or Both for True Position FCFs),PC-DMIS will print out the following in the standard inspection report and the Reportwindow for each individual hit used in the FCF:

Measured X, Y, and Z values

Measured I, J, and K values Deviation of each individual hit MAX or MIN marker at the end of the line whenever the hit produceseither a maximum or minimum deviation.

Report Graphical Analysis -This list displays the output for the FCF in your report.It uses a format suitable for close examination. When you select On (or Both), PC-DMIS will display, in a graphical format that uses coloured arrows, the deviation ofeach individual hit for the FCF used on the part in the report. These arrows, with theircolours and directions, indicate the relative size of the error, as well as its direction.

CAD Graphical Analysis- This list works the same as the Report GraphicalAnalysis list, except that it displays the graphical analysis inside the Graphics Displaywindow.

Arrow Multiplier -TheMultiplierbox let you set a scaling factor that magnifies thedeviation arrows and tolerance zone for the CAD Graphical Analysis mode. If youtype a 2.0 value, PC-DMIS will scale the arrows two times the calculated deviation foreach feature hit. TheMultiplierbox is used for viewing purposes only, and is notreflected in the text printout.

Dimension Info area -This area lets you create a Dimension Info text box for theFCF. When you select theCreate Dimension Info when this dialog closescheckbox, PC-DMIS enables the Edit button. You can click the Edit button to open up adialog box that lets you set default options for the Dimension Info command(DIMINFO). See Edit Default Dimension Info for more information.

When you create your FCF, the dialog box closes and PC-DMIS creates a DIMINFOcommand in the Edit window after the FCF. This DIMINFO command displays alldimension information in the Graphics Display window next to the feature selectedfrom the Feature list in the Feature Control Frame tab. It also displays the sameavailable dimension axes used in the Edit window for that particular FCF.

True Position area -This area become available only when creating a True PositionFCF. For other FCF types it remains greyed out. It contains these items:

Alignment -Sometimes when you view dimension information relative to the currentalignment, the calculations of the datums can sometimes be hard to decipher. Thislist lets you determine how this information should get displayed: relative to aparticular alignment or relative to the datum reference frame.

Fit to Datums -This check box determines whether or not the FCF uses a best fitcalculation to find the optimal position of the datum reference frame that minimizes

the error.


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Nominals and Axes -This portion lets you customize the output by controlling whichaxes PC-DMIS should display in the report and allowing you to manually type thenominal values.

Feature List -The list to the left of the Nominals and Axes columns displays all thefeatures used in the True Position FCF. Select a Feature Set or feature from this list.PC-DMIS then displays the possible axes for that feature.

Report Axis -This column contains check boxes for each axis. A selected check boxsends that axis to the report.

Axis -This column lists available axes for the selected feature.

Nominal -This column contains nominal values. You can overwrite them by clickingon them and typing different values.

+Tol / -Tol -The plus and minus tolerance columns provide fields into which you cantype tolerances for the various axes used in your FCF. PC-DMIS only applies thesetolerance values to axes that relate to size, since the axes that control position usethe main tolerance in the FCF.

Update Feature Nominal -This column lets you specify whether or not any changesyou made to the nominal values should get applied not only to the FCF but to thefeature as well.


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Composite Tolerance for True position

Within PCDMIS the option to apply a composite tolerance is available. From Figure 5you can see that there are two tolerances to be applied.

Figure 5

In Figure 6 it is possible to combine the symbol to two different tolerances thus

creating a composite tolerance (select composite feature control frame option). Thetop tolerance option is to apply the true position in the normal way to ABC, the lowertolerance option allows for the fitting of the group of features as a pattern or featureset to that tolerance

Figure 6


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GdT Pcdmis Training Manual _Issue 1