�y��vlog

In ordinary machine construction, five classes of fits are used, viz; running fit, push fit, driving fit, forced fit and shrinkage fit.

The running fit, as the name implies, is employed when parts must rotate; the push fit is not sufficiently free to rotate; the other classes referred to are used for assembling parts that must be held in fixed positions.

Formerly, these sleeves were given two treatments after carburization in order to refine the case and the core, and then sent to the grinding department, where they were ground to a push fit for the hubs.