Why Tolerance Is Minus On Bars For Machining

This article from the PMPA blog site discusses steel bars for machining. The dimensions on the bars are held to minus rather than the plus side. They are done this way because if the bars were the same size as the holes, it would be very difficult to assemble them. The bars need to be measured smaller than the hole size so that they can be assembled thoroughly.

Read the full article here:
Why Tolerance Is Minus On Bars For Machining

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