[PDF] “ Machine Drawing ” by K. L. Narayana – Download Book

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Machine Drawing Book

In this system, the size of the hole is obtained by adding the allowance to the basic size of the shaft. This gives the design size for the hole. Tolerances are then applied to each part. In this system, the upper deviation of the shaft is zero. The letter symbol for this situation is ‘h’. The shaft basis system is preferred by (i) industries using semi-finished shafting as raw materials, e.g., textile industries, where spindles of same size are used as cold-finished shafting and (ii) when several parts having different fits but one nominal size is required on a single shaft.