Measurement Chapter

1
Measurement Chapter

• Bilateral and Unilateral Tolerance
• Clearance and Interference Fit

? Southwest Wisconsin Technical College 2006
2
Tolerance

• Bilateral Tolerance
• 2.355 ? 0.005

2.360
2.355
2.350
3
Tolerance

• Unilateral
• 1.480

0.000 -0.007
1.480
1.473
4
Tolerance

• Unilateral
• 12.85 mm

0.01 mm -0.00 mm
12.86 mm
12.85 mm
5
Convert 1 of 2

• Convert the unilateral tolerance to a bilateral
  tolerance.
• 1.295

• ______ ? ______

0.000 -0.010
1.295
1.295
?
1.285
1.285
6
Convert Unilateral to Bilateral
0.000 -0.010
1.295
1.295
0.010
1.285
7
Convert Unilateral to Bilateral
0.000 -0.010
1.295
0.005
1.290
0.005
0.010
0.005
1.290
8
Convert 2 of 2

• Convert the unilateral tolerance to a bilateral
  tolerance.
• 4.885

4.889
0.004
0.004 -0.000
4.885
Min.
Max.

9
Measurement Chapter

• Clearance and Interference Fit

10
Clearance Fit
Total Clearance
11
Clearance Fit
Total Clearance
12
Range of Clearance Fit

• Maximum Clearance

• Minimum Clearance

13
Range of Clearance Fit

• Maximum Clearance

14
Range of Clearance Fit

• Minimum Clearance

15
Determine Clearance 1 of 2

• Determine the maximum and minimum clearance.

A 1.25 ? 0.03
1.28
Max A _______ Min A _______ Max B _______ Min
B _______
1.22
1.21
B 1.18 ? 0.03
1.15
Maximum Clearance Largest Hole Smallest Pin
Maximum Clearance 1.28 1.15
0.13
16
Determine Clearance 1 of 2

• Determine the maximum and minimum clearance.

0.13
A 1.25 ? 0.03
1.28
Max A _______ Min A _______ Max B _______ Min
B _______
1.22
1.21
B 1.18 ? 0.03
1.15
Minimum Clearance Smallest Hole Largest Pin
Minimum Clearance 1.22 1.21
0.01
17
Determine Clearance 2 of 2
A
2.0334 ? 0.0005
B
2.0360 ? 0.0005
2.0339
2.0329
Max A _______ Min A _______ Max B _______
Min B _______
2.0365
2.0355
Maximum Clearance Largest B Smallest A
0.0036
Maximum Clearance 2.0365 2.0329
18
Determine Clearance 2 of 2
A
2.0334 ? 0.0005
Max Clearance 0.0036
B
2.0360 ? 0.0005
2.0339
2.0329
Max A _______ Min A _______ Max B _______
Min B _______
2.0365
2.0355
Minimum Clearance Smallest B Largest A
0.0016
Minimum Clearance 2.0355 2.0339
19
Interference Fit
Total Interference
20
Interference Fit 1 of 1

• Determine the maximum and minimum interference.

9.97 mm
9.91 mm
Max A _______ Min A _______ Max B _______
Min B _______
9.88 mm
9.82 mm
A
Diameter of Pin 9.94 mm ? 0.03 mm
Maximum Interference Largest A Smallest B
B
Maximum Interference 9.97 mm 9.82 mm
Diameter of Hole 9.85 mm ? 0.03 mm
0.15 mm
21
Interference Fit 1 of 1

• Determine the maximum and minimum interference.

0.15 mm
9.97 mm
9.91 mm
Max A _______ Min A _______ Max B _______
Min B _______
9.88 mm
9.82 mm
A
9.94 mm ? 0.03 mm
Minimum Interference Smallest A Largest B
B
Minimum Interference 9.91 mm 9.88 mm
9.85 mm ? 0.03 mm
0.03 mm
22
Worksheet

• Part I Work with bilateral and unilateral
  tolerance.
• Part II Convert unilateral tolerance to
  bilateral equivalent.
• Part III Solve clearance and interference
  problems.

23
The End

• Written by Peter C. Esser
• Southwest Wisconsin Technical College
• ?2006 2007
• pesser_at_swtc.edu