25" DOC 60% step with a 3/8" EM in aluminum doesn't bother me at all.This is aluminum of course, AND NOT AT 2000RPM either. I also have leaned to rough conventional and I've started using data flute end mills (aluminum rougher finisher carbide 2 flute) and have seen metal removal close to double. This has proved reliable on hundreds and hundreds of parts to within. G53 G0 X9 Y6 (rapid to convenient place to change parts) ![]() ![]() ![]() G91 G28.1 Z0 X0 Y0 (Ref all three axis from current position) I have learned to program the machine to re-ref each axis is at the end of each part. 003, but running the same program again a different axis could be off. everything from temperature to how much oil is on the screw, in the nut, on the ways etc effects lash so after making a few hundred moves one axis may be off by. I run it all the time and it does induce some error. I ran $1000 worth of parts for various customers last month (exponentially increasing so far) and every one of them had BLC turned on. getting it as low as possible decreases how violent the "catch up" is, how long the pause has to be, and the error associated with lash. ![]() Backlash comp is fairly violent and causes a controlled stop at direction changes leaving witness marks.
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