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Measurement Measurement ChapterChapter
Bilateral and Unilateral ToleranceBilateral and Unilateral ToleranceClearance and Interference FitClearance and Interference Fit
Southwest Wisconsin Technical College 2006
ToleranceTolerance
Bilateral ToleranceBilateral Tolerance 2.355” 2.355” 0.005” 0.005”
2.3
55”
2.3
50”
2.3
60”
0.005”0.005”
ToleranceTolerance UnilateralUnilateral
1.480”1.480”+0.000”
-0.007”
1.4
80”
1.4
73”
0.007”
ToleranceTolerance UnilateralUnilateral
12.85 mm12.85 mm+0.01 mm
-0.00 mm
12.8
5 m
m
12.8
6 m
m
0.01 mm
Convert: Unilateral to Convert: Unilateral to BilateralBilateral
1.2
95”
1.2
85”
0.010”
+0.000”
-0.010”
1.295”
0.010”
Convert: Unilateral to Convert: Unilateral to BilateralBilateral
1.2
90”
1.2
85”
Min.
1.2
95”
Max.
0.005”0.005”
+0.000”
-0.010”
1.295”1.290”
± 0.005”
Convert Convert 2 of 22 of 2
Convert the unilateral tolerance to a Convert the unilateral tolerance to a bilateral tolerance.bilateral tolerance.
4.885”4.885”+0.004”
-0.000”
4.8
89”
4.8
85”
0.004”
Min.
Max.
±
Measurement Measurement ChapterChapter
Clearance and Interference Clearance and Interference FitFit
Clearance FitClearance Fit
Total Clearance
Clearance FitClearance Fit
Total Clearance
Range of Clearance FitRange of Clearance Fit
Maximum ClearanceMaximum Clearance
Range of Clearance FitRange of Clearance Fit
Minimum ClearanceMinimum Clearance
Determine Clearance Determine Clearance 1 of 21 of 2
Determine the Determine the maximummaximum and and minimumminimum clearanceclearance..
A: 1.25” 0.03”
B: 1.18” 0.03”
Max A: _______
Min A: _______
Max B: _______
Min B: _______
1.28”
1.22”
1.21”
1.15”
Maximum Clearance = Largest Hole – Smallest PinMaximum Clearance = 1.28” – 1.15”
= 0.13”
Determine Clearance Determine Clearance 1 of 21 of 2
Determine the Determine the maximummaximum and and minimumminimum clearanceclearance..
A: 1.25” 0.03”
B: 1.18” 0.03”
Max A: _______
Min A: _______
Max B: _______
Min B: _______
1.28”
1.22”
1.21”
1.15”
Minimum Clearance = Smallest Hole – Largest PinMinimum Clearance = 1.22” – 1.21”
= 0.01”
= 0.13”
Determine Clearance Determine Clearance 2 of 2 2 of 2
A
B
2.0360” 0.0005”
2.0334” 0.0005”
Max A: _______ Min A: _______
Max B: _______ Min B: _______
2.0339”
2.0329”2.0365
”2.0355”Maximum Clearance = Largest B –
Smallest AMaximum Clearance = 2.0365” – 2.0329”
= 0.0036”
Determine Clearance Determine Clearance 2 of 2 2 of 2
A
B
2.0360” 0.0005”
2.0334” 0.0005”
Max A: _______ Min A: _______
Max B: _______ Min B: _______
2.0339”
2.0329”2.0365
”2.0355”Minimum Clearance = Smallest B –
Largest AMinimum Clearance = 2.0355” – 2.0339”
= 0.0016”
Max Clearance= 0.0036”
Interference FitInterference Fit
Total Interference
Interference Fit Interference Fit 1 of 11 of 1
Determine the Determine the maximummaximum and and minimumminimum interferenceinterference..
A
B
Diameter of Pin:9.94 mm 0.03 mm
Diameter of Hole:9.85 mm 0.03 mm
Max A: _______ Min A: _______
Max B: _______ Min B: _______
9.97 mm
9.91 mm9.88
mm9.82 mm
Maximum Interference
= Largest A – Smallest BMaximum Interference
= 9.97 mm – 9.82 mm
= 0.15 mm
Interference Fit Interference Fit 1 of 11 of 1
Determine the Determine the maximummaximum and and minimumminimum interferenceinterference..
A
B
9.94 mm 0.03 mm
9.85 mm 0.03 mm
Max A: _______ Min A: _______
Max B: _______ Min B: _______
9.97 mm
9.91 mm9.88
mm9.82 mm
Minimum Interference
= Smallest A – Largest BMinimum Interference
= 9.91 mm – 9.88 mm
= 0.03 mm
= 0.15 mm
WorksheetWorksheet
Part I :Part I : Work with bilateral and Work with bilateral and unilateral tolerance.unilateral tolerance.
Part II:Part II: Convert unilateral tolerance Convert unilateral tolerance to bilateral equivalent.to bilateral equivalent.
Part III:Part III: Solve clearance and Solve clearance and interference problems.interference problems.
The EndThe End
Written by Peter C. EsserWritten by Peter C. Esser Southwest Wisconsin Technical Southwest Wisconsin Technical
CollegeCollege 2006 & 20072006 & 2007 [email protected]@swtc.edu
