Ashaft carrying an idler sheave for a belt drive system is to have a nominal size of 2 in. the sheave must rotate reliably on the shaft, but with the smoothness characteristic of accurate machinery.

specify the limits of size for: .
the shaft .
the sheave bore -
list the limits of clearance that will result.

note: the design size of the hole is the basic size and the allowance should be applied to the shaft (basic hole system)