RapidChange ATC: ATC for ER20 (and other) spindles

What load and unload rpm are you running, and what’s your engage feed rate, Jim?

My load/unload are 1450/1500 currently. I don’t have a great tachometer, but the strobe app and sound spectrum analyzer apps on my cell phone say my spindle runs about 10% faster than what I set, so these are more like1600/1650 probably.
I didn’t measure a big difference on torque based on rpm, so I’ll probably back off on the rpm at some point. I’m hoping the new macros will give more torque with less rpm.

I adjusted the plunge rate so that when engaging the nut it neither depressed the nut, nor pulled it up. That turned out to be 50ipm (1270mm/min).

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