If the accuracy you are looking for is less then you should have no need to mic parts repeatedly or consider many of the other things you mention for small batches once you have produced the first acceptable part.
I use this technique to produce batches of model train wheels etc quite regularly and the accuracy between parts if fine for purpose.
For ultimate precision as you say use of a mic will be required to allow for most or all of the other variables you mention.
Gerry
Leeds UK
________________________________
> To: GrizHFMinimill@yahoogroups.com
> From: dave_mucha@yahoo.com
> Date: Tue, 6 Dec 2011 12:13:30 +0000
> Subject: [GrizHFMinimill] Re: digital read out from Rockler ?
>
>
>
> I have to totally disagree.
>
> the DRO allows you to get close, fast. you do not have to count handle
> turns, just watch the numbers rolling by.
>
> a 1/4" 2 flute end mill OD is not the same OD, nor will it cut the same
> slot as a 4 flute.
>
> with indexable inserts, the radius has to be allowed for. as does tip
> wear, and machine play and machine/part/tool temperature.
>
> you rough in with the DRO, you finish with the mic's.
>
> using a DRO with 0.005" readout would speed up most work by orders of
> magnitude. the skill is in the finish and that is operator ability.
>
> IMHO, the DRO is a simple tool. it can be calibrated to achieve
> superior accuracy, but at some point it will be more accurate than the
> machine. and if the machine goes from one end of it's play, to the
> other, it could easily be a couple thou. the DRO would never know it.
>
> Dave
>
> >
> > The reason for DROs is so that you can make accurate stuff *without*
> > measuring with mics, and so that bend, springback, slop, mounts, screws
> > and bearing errors are eliminated.
> > DROs are really good and useful, precisely because they allow one to
> > actually get to 0.01 mm accuracies, easily, fast, and without measuring
> > with mics.
> >
>
>
>
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