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Jon Elson

wrote:
I need to get some parts made, and am going to approach a few of the
local and online cnc machine shops. I need 300 tubes made, and up to
now I have been doing these on my manual lathe in lower, "as I need
them" quantities.

On my lathe, I was able to hold a .0005 tolerance, which I think would
be called +/- .00025.

Is asking for +/- .00015 too much to ask for a cnc job? Would this be
deemed extreme, or add to normal costs?

This tolerance is by no way "extreme", but believe me, it WILL
add to the cost. If you don't need that kind of tolerance,
don't ASK for it. I rarely try to push general "stuff" much
tighter than +/- .003", but for shaft fits and such I do go a
bit tighter.

Jon