Upload
rosalind-bridges
View
216
Download
0
Tags:
Embed Size (px)
Citation preview
1
Come Warm Up Come Warm Up
With the Girls of With the Girls of
Alpha Phi Alpha Phi ........
For more info contact: [email protected]
Alpha Phi is a sorority at UWO that believes in ... Sisterhood, Scholarship, Service, LeadershipLeadership,
Loyalty, Life Long Friends, Memories
2
ES050 – Introductory Engineering Design and Innovation Studio
Engineering drawings
Prof. Paul Kurowski
January 13, 2010
3
Creating drawings
4
pot.SLDPRT
pot.SLDDRW
Creating drawings
5
bracket.SLDPRTbracket.SLDDRW
Creating drawings
6
hanger.SLDPRT
Creating drawings
7
WRONG
Creating drawings
8
CORRECT
Creating drawings
9
Drawings are constructed to strict standards to ensure a consistent
interpretation.
Often are part of a contractual document
Emphasis is on clarity and simplicity.
Generally prefer to use symbols over notes since manufacturer may
not speak English.
10
PARTS OF A TYPICAL DETAIL DRAWING
sheet
titleBlock(TOC)
views
revisionblock
notes
11
DRAWING SHEET SIZES
North America International
A 8.5”x11” A4 210mm x 297mm
B 11”x17” A3 297mm x 420mm
C 17”x22” A2 420mm x 594mm
D 22”x34” A1 594mm x 841mm
E 34”x44” A0 841mm x 1189mm
Choose sheet size such that drawing is filled but not crowded (based on number of views and dimensions needed).
12
DRAWING SCALE
Title block indicates scale which is predominantly used for views on drawing.
If a view uses a different scale it must be indicated under that view. Scales are given as whole number ratios
interpret as (drawing unit) : (physical unit) for scaling up: e.g. 2:1, 4:1, 10:1 for scaling down: e.g. 1:2, 1:5, 1:20 must have a 1 in the ratio. e.g. 2:3 not acceptable
Scale is chosen so that the features can be clearly seen.
13
NOTES
Gives useful information not covered by dimensions, symbols or in
the title block.
Can also be used with arrows to indicate features of importance.
Current practice is to limit the use of notes since they may be
misinterpreted.
14
DRAWING VIEWS
Only use the number of views necessary to convey information about the
part (an isometric view is the exception)
Often need only two or three views
Edges which are visible in that view are shown as solid lines
Edges which are not visible are called hidden lines
Best not to show hidden lines
you cannot dimension to hidden lines anyway
they reduce clarity in drawings of complex parts
15
ORTHOGRAPHIC (PROJECTED) VIEWS
Primary views on a drawing
Set of views at 90° to each other
Created by placing part in a virtual box and look through each side.
True size and shape
angles are correct
circles are round
lengths are to scale
16
ORTHOGRAPHIC STANDARD PRACTICE
Choose front view as most descriptive
Determine views to best represent object
Use minimum number of views to completely describe object
Views must be aligned
Views should not be labeled
17
AUXILIARY VIEWS
It is an extra view of an object
It is used when the 6 principal views don’t describe an object (or
some of its features) clearly or completely - in particular inclined
features
Should not be labeled
It is used to show the true lengths of lines
It is used to show the true size of planes
18
AUXILIARY VIEW
ORTHOGRAPHIC (PROJECTED) VIEWS
19
SECTION VIEWS
Useful to show interior features without using hidden lines
Must show section line in another view which indicates the cutting
plane and the direction of view
Does not need to be aligned with parent view but often is shown
aligned to enhance clarity
Must have unique letter label
20
section line
unique view label
cutting plane surfacecross-hatched
SECTION VIEWS
21
ALLIGNED SECTION VIEWS
22
DETAIL VIEWS
Used as enlargement of another view to enhance clarity of small
features
Must show detail area in parent view with label
Is not aligned with parent view
Must have unique letter label and scale must be indicated since it is
different from the parent view
23
detailareawith label
detail view with labeland scale
DETAIL VIEWS
24
BREAK VIEWS
25
ISOMETRIC VIEW
3D view of part used to help visualization
Common if 3D CAD system used to develop drawing
Used only for a visual reference. Do not dimension this view.
Common now for assembly drawings.
26
Orthographic (projected) views
isometric view
ISOMETRIC VIEW
27
28
The view indicated by the callout is:
A Projected
B Auxiliary
C Section
D Aligned section
E Detail
ES1050 PART 01.sldprt
What type of view is this?
29
What type of view is this?
The view indicated by the callout is:
A Projected
B Auxiliary
C Section
D Aligned section
E Detail
ES1050 PART 01.sldprt
30
What type of view is this?
The view indicated by the callout is
A Section
B Aligned section
C Detail
D Broken out section
E Break
flange.sldprt
31
flange.sldprt
What type of view is this?
The view indicated by the callout is:
A Projected
B Auxiliary
C Section
D Aligned section
E Detail
32
What type of view is this?
The view indicated by the callout is
A Projected
B Section
C Detail
D Broken out section
E Break
flange long.sldprt
33
CENTRE LINES
Used to indicate centres of full circles and axis of cylindrical features
34
ASSEMBLY DRAWINGS
Assembly drawings show all the parts and how they go together.
Dimensions are not usually required.
A parts list or Bill of Material (BOM) specifies the item, quantity, description, part
number, etc. for each part.
The item numbers from the parts list for each part are indicated using numbered
balloons in the view.
Common styles used for assembly drawings:
as assembled view
section view
exploded view - Preferred!
Notes are used for assembly and machining instructions
35
ASSEMBLY DRAWING AS ASSEMBLED
BOM
36
ASSEMBLY DRAWING SECTION VIEW
37
ASSEMBLY DRAWING EXPLODED VIEW
38
DIMENSIONING OUTLINE
General Rules
Linear Dimensions
Angular Dimensions
Radial Dimensions
Diameter Dimensions
Holes
Tolerances
39
INTRODUCTION
Dimensions give size, location and details of all features of the part.
Manufacturing method is not specified but driven by dimensions,
material and tolerances.
Dimensions are used per a standard to ensure consistent
interpretation and clarity
Dimension standard often indicated on drawing in title block.
40
GENERAL RULES
Text height for dimensions and notes typically either .12” or 3 mm. Text is always uppercase. Units are usually either inches or millimetres. If using inches:
no zero precedes decimal (.250) dimensions expressed to same number of decimals as its tolerance
(.250±.002) If using millimetres:
zero precedes the decimal (0.5) no trailing zeros are required (2±0.5, 3.25±0.1)
Dimension text is always horizontal. Do not dimension to hidden lines.
41
LINEAR DIMENSIONS
extensionline
dimensionline visible gap
42
DIMENSION PLACEMENT
Dimensions are placed outside the part. Do not crowd dimensions and avoid crossing dimension lines with
extension lines.
aligned
space
space
43
ANGULAR DIMENSIONS
44
RADIAL DIMENSIONS
Small radii are called fillets. Preference is to use unlocated centres (easier to measure)
Unlocated Centre Located Centre
radiussymbol
centremark
leader line
45
RADIAL DIMENSIONS
Never dimension to radii tangent points.
Tangent point
46
DIAMETER DIMENSIONS
centreline
diametersymbol
small diameters(arrows don’t fit inside)
large diameter
47
HOLE DIMENSIONS
Multiple holes are common on parts so standardized symbols have been adopted.
depthsymbol
note drillpoint
depth of fulldiameter
Thru Hole Blind Drilled Hole
48
COUNTERBORED HOLES
Thru Hole Blind Hole
counterboresymbol
counterborediameter & depth
Note: depths always measured from top surface
49
DIMENSIONING TECHNIQUES
Must give position and size of each feature but only once on the
drawing.
do not dimension the same feature again in a different view
unless dimension for reference only
Dimension based on the function of the feature.
Dimension to reduce tolerance stack-up for critical features.
Always dimension position of holes to their centre not their edge.
Tolerance scheme in the solid model may not be suitable for the
drawing.
50
OVER DIMENSIONED
51
REPEATED FEATURES
Repeat symbol
52
WHAT IS WRONG?
lever.sldprt
53
WHAT IS WRONG?
54
WHAT IS WRONG?
55
WHAT IS WRONG?
56
WHAT IS WRONG?
57
WHAT IS WRONG?
58
WHAT IS WRONG?
flange.sldprt
59
WHAT IS WRONG?
60
WHAT IS WRONG?