Discuss design specifications and classes of fits including transition, clearance and interference fit.
What will be an ideal response?
Drawings of interchangeable parts contain design data that deal with fits. The term fit is produced by an allowance for clearance, interference, and either clearance or interference in what is known as a transition fit. A drawing dimensioned for a fit provides information about the range of tightness between two mating parts. When the parts move in relation to each other, the dimensions must provide for a positive clearance. The amount of positive clearance depends on the kind of material in the parts, the nature of the motion, lubrication, temperature, and other forces and factors. Machined parts with a positive clearance are dimensioned for a clearance fit. A negative clearance is required with parts that are to be forced together as a single unit. Parts requiring a negative clearance are dimensioned for an interference fit.
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What will be an ideal response?
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