Abstract:The allocation of proper production tolerances is a vey important task if the finished design is to achieve its intendend purpose. In view of tribodesign optimizing the tolerance of fit is helpful for the production costs and the characters of slider fricition pair. To obtain the great assembly clearance by reducing the accuracy is neither reliable nor economical and will lead to the loss of the machine reliability. Based on ISO standard system,a set of mathematic models were built in cooperation with the tribodesign software. This program can facilitate the tolerance of fit design and selection process.

Key words: tolerance fit reliability service probability distribution machining precision tribology design CAD