Andy Pugh wrote: > 2009/6/10 Jack Coats <[email protected]>: > > >> Most of us are just trying to 'get-er-done', so working within 'practical >> tollerances' >> for 'practical solutions', is probably the most helpful. >> > > Absolutely, I posted a rather longer message on pretty much that subject. > > I think the biggest crimes, in working too close is concerned is committed buy young and inexperienced engineers. If they don't know how sloppy a thing can be the tendency is to tighten everything up in very close tolerances. It also allows bragging rights as to who is doing the finest work. On a cnc machine the accuracy is always from some starting point. If you want to hold a center distance between two gear centers. In such a case accuracy back to the home point has to be too .0005 or better to hold a center distance between the two gears to .001. A machinist could run a worn out machine and still hold the center distance between gear centers a cnc machine needs a high level of accuracy to hold tolerances between cuts or hole centers. There is almost no advantage in having wide open tolerances on a part with cnc the machine if in any kind of shape at all will hold pretty tight tolerance anyway. Doug
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