dave wrote: > I had and occasion to make some oblong blocks approx .75 x 1.5 inches. > Made 20 of them so this was a good chance to at least calc SD. > SD came out at 0.001. This was with normal feeds and speeds. Rougher at > +.003 followed by finisher. BTW - dimensions were biased positive by a > thou or two; which could presumably be dialed in to parts +/- the SD. > Not bad, really. Hard to know whether this was due to backlash, tool wear, thermal expansion, or what. It might have been interesting to know the order of the parts made/measured, and then curve fit or just graph to see trends. Expansion of spindles is a major concern, the high-end machines have chillers for the spindle oil bath. The REALLY high-end ones run chiller water through hollow ballscrews to prevent thermal expansion.
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