Small Mill very early design stage

[leadinglights]

Hmmm
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I suggest you aim for 5 micron accuracy, the resolution of your everyday digi-caliper. You will then get 25 microns fairly easily. You will then realise 25um it isn't enough.
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Robin

Hi Robin,

1 thou , 0.001 inch, 25 microns for the youngsters, is quite easy over a small distance with a well adjusted machine, but gets progressively harder over long distances. I have aimed at this over the 200mm by 200mm by 100 mm range, quite tight enough - and even if I get close it should be good.

I have rejected converting an old milling machine on a simple basis, space available is of the order of 1000mm by 600mm including access so say 600mm by 600mm.