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Blueprint Reading for the Machine Trades, Sixth Edition Unit 2: Dimensioning Systems. Russ Schultz and Larry Smith PowerPoint presentation created by LaVonne Vichlach. Dimensioning Systems. Four different systems of dimensioning used in U.S. and Canada Fractional inch Decimal inch
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Blueprint Reading for the Machine Trades, Sixth Edition Unit 2: Dimensioning Systems
Russ Schultz and Larry Smith
PowerPoint presentation created by LaVonne Vichlach
Record the scale length identified by
1
Record the scale length identified by
2
Record the scale length identified by
3
Record the scale length identified by
4
Record the scale length identified by
5
Record the scale length identified by
6
Record the scale length identified by
7
Record the scale length identified by
8
Record the scale length identified by
9
Record the scale length identified by
10
Record the scale length identifiedby...
1
Record the scale length identified by…
2
Record the scale length identified by…
3
Record the scale length identified by…
4
Record the scale length identified by…
5
.11
.12
.16
.23
.44
.55
.56
.64
.80
.88
1.06
1.67
2.20
2.45
3.34
3.77
5.56
6.66
7.04
8.88
Record the scale length identified by
1
Record the scale length identified by
2
Record the scale length identified by
3
Record the scale length identified by
4
Record the scale length identified by
5
From the information on this drawing, could you make this part?
Could you make this one?
What are the basic dimensions of the A-size drawing?
8 ½ X 11
2. If C-size is twice as large as B-size, how much larger is it than A-size?
4X
Will an E-size print fold to fit in the same envelope with an A-size print?
A2
YES
4. What metric size is twice as large as the A3 size?
Are the A4 metric size and the A inch size exactly the same? (Use 1in = 25.4 mm or 1mm = .03937 in. to compare)
NO
UNLESS OTHERWISE SPECIFIED
METRIC UNITS ARE MILLIMETERS
FILS & RNDS ARE .12R
PART SYM ABOUT CL
5 HOLES EQL SP ON 6.000BC
.344 DR, .500 CBORE, .30 DP
.281 DR, 82° CSK, .53 DIA
General
Leader
Above the title block
Symmetrical and centerline
Drill and countersink
1. What is the part number?
11A001
2. What is the name of the part?
Thermostat gasket
3. What is the drawing size? (A, B, or C)
A
4. What scale is the drawing?
1:1
5. Use words to explain the answer to question 4.
Actual size
6. How thick is the part?
.06
7. Is the part symmetrical?
Yes
8. Which system of dimensioning was used? (Refer to page 21.)
Decimal
9. What is the fractional equivalent of the center hole size? (Refer to the equivalency chart, page 25.)
2 3/16
3 5/8
11. Calculate the longest overall dimension of the part.
4.24
12. Calculate the overall dimension of the part (height.)
2.88
13. Calculate the material remaining between the large hole and the nearest outside edge.
.345
14. Calculate the material remaining between the small hole and the nearest outside edge.
.155
15. Calculate the material remaining between the large hole and the nearest small hole.
.56
Drawing is full size and does not require a “B” size drawing
Enter dimensions for the letters provided.
A
1.50
B
3.60
C
.30
D
1.47
E
6.10
F
2.00
G
.19
H
.57
I
.86
J
.68
K
.10
L
.46
1. What type of line was drawn to indicate symmetry?
Centerline
2. What word is abbreviated TYP?
Typical
3. What is the thickness of the plate?
.25
4. How many round holes does the plate contain?
10
5. What is the fractional equivalent of the small hole diameter?
9/32
6. How much material remains between a .62 Dia. hole and the nearest outside edge?
.25
7. How much material remains between a .28 Dia. hole and the nearest outside edge?
.16
8. Calculate the longest overall dimension of the plate.
6.76
1. What is the two place decimal tolerance in Example A?
.03
2. What is the tolerance for drilled holes in Example A?
+ .010
-.002
3. What is the three-place decimal tolerance in Example B?
.004
4. What is the fractional tolerance in Example C?
1/64
5. What is the total tolerance for the two-place decimal inch in Example A?
.03
030’
.004
+ .010
-.002
.020
No
Yes
8
.005
.008
.010
.010
.02
.1875
120°
60°
180°
30°
±0°30’
What is the dimension for A?
1.15
What is the dimension for B?
1.125
What is the dimension for C?
.625
What is the dimension for D?
.525
What is the dimension for E?
.275
Sizes are exaggerated. NTS-Not To Scale
Sizes are exaggerated. NTS-Not To Scale
X
1.005
.995
3.005
2.995
1.30
1.32
.349
.339
.30
.32
.66
.64
X
X
.905
.895
1.91
1.89
X
.258
.248
.370
.380
Use the formula for calculating allowance:
MMC Hole - MMC Shaft = Allowance
MMC Hole=.999
-MMC Shaft A=.998
Allowance=.001 (positive)
MMC Hole=.999
-MMC Shaft B=1.004
Allowance=-.005 (negative)
What is the MMC of hole “D?”
.748
What is the MMC of Shaft “C?”
.745
What is the allowance between “C” and “D?’
.003
Is the allowance positive or negative?
Positive
Is it a clearance or interference fit?
Clearance
What is the MMC of hole “F?”
.743
What is the MMC of shaft “E?”
.747
What is the allowance between “E” and “F?”
-.004
Is the allowance positive or negative?
Negative
Is it a clearance or interference fit?
Interference
What is the LMC of hole “D?”
.752
What is the LMC of Shaft “C?”
.735
What is the allowance between “C” and “D?’
.017
Is the allowance positive or negative?
Positive
Is it a clearance or interference fit?
Clearance
What is the LMC of hole “F?”
.745
What is the LMC of shaft “E?”
.743
What is the allowance between “E” and “F?”
.002
Is the allowance positive or negative?
Positive
Is it a clearance or interference fit?
Clearance
(a) half-size
.500
Cold-Rolled Steel
10
Vertical
60
120
030’
.01
.005
4.995
+.010
-.002
.686
9.00
10.50
Enter the dimension for the letter “A.”
.50
Enter the dimension for the letter “B.”
.531
Enter the dimension for the letter “C.”
1.00
Enter the dimension for the letter “D.”
.656
Enter the dimension for the letter “E.”
.687
Enter the dimension for the letter “A.”
.81
Enter the dimension for the letter “B.”
2.32
Enter the dimension for the letter “C.”
.15
Enter the dimension for the letter “D.”
3.28
Enter the dimension for the letter “E.”
7.26
Enter the dimension for the letter “F.”
1.72
Enter the dimension for the letter “G.”
1.58
Enter the dimension for the letter “H.”
.42
Enter the dimension for the letter “I.”
30°
Enter the dimension for the letter “J.”
3.98
Enter the dimension for the letter “K.”
.01
Enter the dimension for the letter “L.”
.20
Enter the dimension for the letter “M.”
.19
Enter the dimension for the letter “N.”
.12
Enter the dimension for the letter “0.”
.30
.225
.19
No
2.555
.248