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Engineering Graphics A few highlights

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Page 1: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Engineering GraphicsA few highlights

Page 2: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

1. SHAPE

2. SIZE

3. MATERIAL

4. TOLERANCE

5. FINISH

Documenting a part requires...

Page 4: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Multiview drawings

FRONT RIGHT SIDE

TOP

“3rd angle projection”

Page 5: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Six Principle views: obey layout

Page 6: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Basic lines (the “alphabet of lines”)

Object line

Hidden line

Center line

Dimension line

Page 7: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

FIND THE MISTAKES!

FRONT

Page 8: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

CORRECT DRAWING

Page 9: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Interpreting Center Lines

Enough Info? Enough Info?

Page 10: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

COULD BE THIS...

Page 11: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

OR THIS

Centerlines imply symmetry, NOT revolution per se

Page 12: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

HERE, ONLY 2 VIEWS NEEDED(Correct drawing)

Page 13: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Find The Mistakes!

Page 14: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Find The Mistakes!

Page 15: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

SECTIONS

A A

YES NO

Page 16: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

DIMENSIONING

1. SHAPE

2. SIZE3. MATERIAL4. TOLERANCE AND FINISH

Page 17: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Dimensioning rules:…find the mistakes.

3

5

5

3

5

3

5

2

Page 18: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 19: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

www.mcmaster.com

http://www.mcmaster.com/
Page 20: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Example

Page 22: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the
Page 23: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the
Page 24: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the
Page 25: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

TOLERANCES

www.efunda.com/processes/machining/drill_press.cfm

www.efunda.com/processes/machining/drill.cfm

Page 26: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

½ inch drill bit: +/- .0040

½ inch reamer: +.0003, -.0000

Page 27: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Tolerance stack-up

3.0 ± .05 5 high stack

?14.7515.25

What is min and max height of stack?

Page 29: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Tolerance Stacking

What’s the tolerance (+/-) on dimension x? Ans: +/- 0.3

Page 30: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Geometric Dimensioning and Tolerancing (GD&T)

Page 33: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Traditional tolerancing is ambiguous

3.000±.005

1.000 ±.005

? ?

Page 34: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Ambiguity…

.25 ± .01

.25 ± .01

+ +

Square deviation Circular deviation

Page 35: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Threaded FastenersWhat they are and how to indicate on a drawing

Page 37: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Head shapes

Pan

Flat

Round

Cap screw

Socket head cap screw (SHCS)

Set screw

Page 39: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Driving a fastener

Slotted

Phillips

Torx

Hex cap

Hex head(Allen head)

Page 40: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

www.mcmaster.com

¼-20, RHMS, slotted, steel

http://www.mcmaster.com/
Page 41: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Name the Fastener:

Page 42: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Name the Fastener:

Socket Head Cap Screw

Socket Head Cap Screwwith counterbore

Page 43: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the
Page 44: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Phillips Flat Head Screw with countersink

Page 45: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Holes

DEPTH0.75 REF

19 DRILL – 0.75 DEEPor

O .166 . 75

Pix from www.mcmaster.comunless noted

Page 46: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Convention for threaded holes

FRONT

TOP

FRONTSECTION

6-32 THRU

Page 47: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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 A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Countersunk holes

.562 – 82O CSK, 1.125

.562 1.125 x 82O

Page 49: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

Counterbored holes

19 DRILL – 29 CBORE, 14 DEEP

C-BORE DEPTH

19 29 14

Page 50: Engineering Graphics A few highlights. See “A Brief Introduction to Engineering Graphics” in the Resources section of the ME2011 web site See Q01 on the

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