Re: Ambiguous Measurement Terminology, slightly off topic

From: Glyn Churchman (
Date: Fri Feb 05 1999 - 02:00:13 EET

I remember when I was a machinist in the '70s, it being in vogue to use RCH and
the not so fine BCH. I really appreciate the explanations of dead nuts. I've
been asking about that one for many years, with no luck. I'm not so sure that
we have had the definitive explanation yet, though.

Glyn Churchman

"David (Thor) Maxfield" wrote:

> > Yes, but you just missed by an RCH.
> Ah Yes! In the good old days, before RP and PC, there was no more highly
> accepted standard than to be within one RCH of the target. dimension.
> David Maxfield
> Incre, LLC
> For more information about the rp-ml, see

For more information about the rp-ml, see

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