Question
Download Solution PDFA hole and shaft combination has a 20H7g6 fit. For 20H7 deviations are 0 & +21 microns and for 20g6 deviations are -7 & -20 micron. Find the maximum clearance between hole and shaft?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Clearance:
- In a fit the clearance is the difference between the size of the hole and the size of the shaft which is always positive.
Maximum clearance:
- In a clearance fit or transition fit, it is the difference between the maximum hole and minimum shaft.
Minimum Clearance:
- In a clearance fit, it is the difference between the minimum hole and the maximum shaft.
Upper Deviation:
- It is the algebraic difference between the maximum size and the basic size.
Lower deviation:
- Lower deviation is the difference between the minimum limit of size and the basic size.
Fundamental deviation:
- Fundamental deviation is the deviation closest to the basic size.
Calculation:
Given:
Fit: 20H7g6
Hole: 20H7
deviations are 0 & +21 microns
Shaft: 20g6
deviations are -7 & -20 micron
Maximum clearance = (maximum hole) - (minimum shaft)
⇒ Maximum clearance = +21 - (- 20) = +21 + 20 = 41 microns
Last updated on May 28, 2025
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