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Engineering and machining specifications are usually in 0.001” and referred to as thousandth’s or “thou’s”. Tools like wrenches or drill bits use fractions in t
by cjsawyer 6y ago
Engineering and machining specifications are usually in 0.001” and referred to as thousandth’s or “thou’s”. Tools like wrenches or drill bits use fractions in the form x+1/2^n like 2 1/2 == 2.5”. It goes down to 1/64, I think.
- userbinator 6y agoThey also speak of tenths which are 0.0001" units, i.e. "tenth of a thou". This jargon tends to confuse those who are new to it, but has been around for over a century.
- DerekRobot 6y agoIt's a really well-sized unit for that kind of work. I know exactly what a thou is and how to keep things in spec, but I'm lost using mm.
- beojan 6y agoThous, and tenths even more so, are more akin to microns in metric.