How to Specify Tolerances on CNC Machining Drawings: A Practical Guide for Engineers
A CNC machining drawing is a contract between you and your manufacturer. When it’s clear, complete, and correctly toleranced, everything runs smoothly. When it’s ambiguous, over-constrained, or missing key callouts, you get late quotes, production delays, and parts that don’t work — even when the machining was technically correct.
This guide covers the practical mechanics of tolerancing a CNC machining drawing correctly: what to specify, where to apply tight tolerances, how to use GD&T effectively, and the mistakes that cost engineers the most time and money.
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