Duane Bozarth wrote:

lgb wrote:
...
A chisel cannot be both 19mm and 3/4"!

To a marketer, what's the problem?????

To what tolerances are chisels made? It's possible to make one that is
within .001" of being both. If your specification tolerance is, say, .005,
then making two different sizes you'd end up with some 19mms that were
wider than some 3/4, and some 3/4 that were wider than some 19mm. All
you'd have to do is make your target midway between is cut your working
tolerance to .004 and your one-size would be within spec for of both sizes,
so why not just make the one and give it both measurements?

That particular size is a bad example because the English and Metric sizes
are really close.

3mm and 3/8 inch is a much better example--a chisel made midway between the
two sizes would be .0094" or a little over a 128th off.

--
--John
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(was jclarke at eye bee em dot net)