In the hole basis system, the basic diameter of the hole is constant while the shaft size varies according to the type of fit. This system leads to greater economy of production, as a single drill or reamer size can be used to produce a variety of fits by merely altering the shaft limits.

What is mean by hole basic system?

In a hole basis system, the hole is kept as the constant, and the shaft upper and lower deviation values determine the type of fit. In a hole basis system, the Lower deviation of the hole will be Zero.

What is hole basis system in engineering?

In Hole basis system the hole is kept to constant and the shaft size is changed according to the different types of fit. In this method, depending upon the basis size lower limit follows the size of basis, this is due to the lower deviation of the hole is zero in this system.