Colin K wrote: > Anyway, I went down tonight and put a .0005" indicator on and homed it a few > times to see what happened. The needle snapped back to precisely the center > of the 0 line every time. I imagine it's possible that the zero point will > drift over time as the mechanism ages, but these things are rated for tens > of thousands of actuations so probably not too fast. For those of us not > requiring bulletproof repeatability on a machine that runs all day, this > seems like a very simple setup compared to a dual-switch system. > If you are using steppers and Acme screws, this is almost certainly good enough. Swarf, oil and assorted gunk can build up and eventually move the home position, but it is not likely to make much difference. If you have precision ballscrews with minimal backlash and encoders with an index channel, then it is possible to get more repeatable homing, but again, it may not matter unless you have a very accurate machine. It may matter on a Mori-Seiki lathe that can do repeatable parts to .0001" all day, it surely doesn't matter on a 7x10 minilathe.
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