Question
Download Solution PDFIn the hole basis system, the hole is kept constant & the size of the _____ is varied to get the desired fit.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Hole basis System:
- The size of the hole is kept constant and the size of the shaft is varied to get the different classes of fits.
- In this system, a lower deviation of the hole is zero, i.e. the low limit of the hole is the same as the basic size.
- The high limit of the hole and the two limits of size for the shaft are then varied to give the desired type of fit.
Shaft basis system:
- The size of the shaft is kept constant and the size of the hole is varied to get the different classes of fits.
- In this system, an upper deviation of the shaft is zero, i.e. the upper limit of the shaft is the same as the basic size.
- Tolerance is the difference between the upper limit and the lower limit of a dimension.
- In other words, it is the maximum permissible variation in a dimension.
- The tolerance may be unilateral or bilateral.
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