In the hole basis system, the hole is kept constant & the size of the _____ is varied to get the desired fit.

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ALP CBT 2 Fitter Previous Paper: Held on 21 Jan 2019 Shift 1
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  1. Tolerance 
  2. Shaft
  3. Hole
  4. Fit

Answer (Detailed Solution Below)

Option 2 : Shaft
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Explanation:

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.

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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.
 

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  • 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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