Engineering Graphics
-
Upload
erica-sullivan -
Category
Documents
-
view
61 -
download
0
description
Transcript of Engineering Graphics
![Page 1: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/1.jpg)
Engineering GraphicsA few highlights
![Page 2: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/2.jpg)
See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site
See Q01 on the Assignments page for what you need to know for the graphics quiz
![Page 3: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/3.jpg)
1. SHAPE
2. SIZE
3. MATERIAL
4. TOLERANCE
5. FINISH
Documenting a part requires...
![Page 4: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/4.jpg)
Multiview drawings
FRONT RIGHT SIDE
TOP
“3rd angle projection”
![Page 5: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/5.jpg)
Six Principle views: obey layout
![Page 6: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/6.jpg)
Basic lines (the “alphabet of lines”)
Object line
Hidden line
Center line
Dimension line
![Page 7: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/7.jpg)
FIND THE MISTAKES!
FRONT
![Page 8: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/8.jpg)
CORRECT DRAWING
![Page 9: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/9.jpg)
Interpreting Center Lines
Enough Info? Enough Info?
![Page 10: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/10.jpg)
COULD BE THIS...
![Page 11: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/11.jpg)
OR THIS
Centerlines imply symmetry, NOT revolution per se
![Page 12: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/12.jpg)
HERE, ONLY 2 VIEWS NEEDED(Correct drawing)
![Page 13: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/13.jpg)
Find The Mistakes!
![Page 14: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/14.jpg)
Find The Mistakes!
![Page 15: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/15.jpg)
SECTIONS
A A
YES NO
![Page 16: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/16.jpg)
DIMENSIONING
1. SHAPE
2. SIZE3. MATERIAL4. TOLERANCE AND FINISH
![Page 17: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/17.jpg)
Dimensioning rules:…find the mistakes.
3
5
5
3
5
3
5
2
![Page 18: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/18.jpg)
Design Detail½” thick aluminum blockWhich is more expensive: A or B and why?
4.0 4.1
A B
6.0 6.0
What if A was 3.9 in width?
![Page 20: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/20.jpg)
Dimensioning Choices & Design Intent
6
2
2
6
6
4
2
6
A B
If change width of block to 8, what happens to the hole location?
![Page 21: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/21.jpg)
Example
![Page 22: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/22.jpg)
![Page 23: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/23.jpg)
![Page 24: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/24.jpg)
![Page 25: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/25.jpg)
TOLERANCES
www.efunda.com/processes/machining/drill_press.cfm
www.efunda.com/processes/machining/drill.cfm
![Page 26: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/26.jpg)
½ inch drill bit: +/- .0040
½ inch reamer: +.0003, -.0000
![Page 27: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/27.jpg)
Representing tolerances
3.000
1.000
3.0052.995
1.005.995
3.000±.005
1.000±.005
3.000+.005-.005
1.000+.005-.005
![Page 28: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/28.jpg)
Tolerance stack-up
3.0 ± .05 5 high stack
?14.7515.25
What is min and max height of stack?
![Page 29: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/29.jpg)
Tolerance Stacking
What’s the tolerance (+/-) on dimension x? Ans: +/- 0.3
![Page 30: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/30.jpg)
Holes and shafts
.626
.625.623.622
holeshaft
.626
.625.623.622
1. Will all shafts fit into all holes?
A = yes, B = no
2. What is maximum clearance?
A = .001, B = .002, C = .003, D = .004
![Page 31: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/31.jpg)
Design DetailBent aluminum sheet, 1/16” thickA or B: Which is more expensive and why?
A
B4.0 +-
0.003
0.030{
![Page 32: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/32.jpg)
Geometric Dimensioning and Tolerancing (GD&T)
![Page 33: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/33.jpg)
Traditional tolerancing is ambiguous
3.000±.005
1.000 ±.005
? ?
![Page 34: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/34.jpg)
Ambiguity…
.25 ± .01
.25 ± .01
+ +
Square deviation Circular deviation
![Page 35: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/35.jpg)
Geometric Dimensioning and Tolerancing
.25
.125 +/- .002
.01
• Ideal position of hole. .25, is marked with box and no +/- notation.• Feature control box shows how close hole is to exact; within circular tolerance zone with diameter .01
![Page 36: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/36.jpg)
Threaded FastenersWhat they are and how to indicate on a drawing
![Page 37: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/37.jpg)
Threaded Fasteners (screws, bolts)
• Specify diameter, thread, length, head
1/4-20 x 1, RHMS
ROUND HEADMACHINE SCREW1" LONG
20 THREADSPER INCH
1/4" DIA
![Page 38: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/38.jpg)
Head shapes
Pan
Flat
Round
Cap screw
Socket head cap screw (SHCS)
Set screw
![Page 39: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/39.jpg)
Driving a fastener
Slotted
Phillips
Torx
Hex cap
Hex head(Allen head)
![Page 41: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/41.jpg)
Name the Fastener:
![Page 42: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/42.jpg)
Name the Fastener:
Socket Head Cap Screw
Socket Head Cap Screwwith counterbore
![Page 43: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/43.jpg)
![Page 44: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/44.jpg)
Phillips Flat Head Screw with countersink
![Page 45: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/45.jpg)
Holes
DEPTH0.75 REF
19 DRILL – 0.75 DEEPor
O .166 . 75
Pix from www.mcmaster.comunless noted
![Page 46: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/46.jpg)
Convention for threaded holes
FRONT
TOP
FRONTSECTION
6-32 THRU
![Page 47: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/47.jpg)
Blind threaded holes
1/2 – 13 x 1.325 DEEP
THREAD DEPTH
DRILL DEPTH
.4219 1.501/2 – 13 1.325
![Page 48: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/48.jpg)
Countersunk holes
.562 – 82O CSK, 1.125
.562 1.125 x 82O
![Page 49: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/49.jpg)
Counterbored holes
19 DRILL – 29 CBORE, 14 DEEP
C-BORE DEPTH
19 29 14
![Page 50: Engineering Graphics](https://reader036.fdocuments.in/reader036/viewer/2022081506/56812a86550346895d8e2167/html5/thumbnails/50.jpg)