Thread: Top speed failing after a bit
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09-11-2011 #1
I thought I was cutting with the G0 rapid set to step at 20mm/s, blissfully unaware that the end of cut lift was hard programmed at 25mm/s :whistling:
All went swimmingly for 20 - 30 minutes then the 25mm/s lift failed and I blew a tool trying to plunge it through a hardened steel, hold down fixture at 20mm/s. It managed a couple of mm before the tool exploded :naughty:
I've now fixed the 25mm/s override bug, but the question is...
If it failed to handle 25mm/s after things warmed up, is 20mm/s a bit close to the knuckle and likely to fail sometime? I am rather assuming it's a hot motor demagnetising fault, because it worked okay when cold. I could be wrong.
The Z axis motor is necessarily further from it's controller than the X and Y. In the past I have compensated by favouring the G0 vertical with a slower rate than the X and Y, but I was thinking the 240 Volt stepper drivers would make that unnecessary.
I do like the 20mm/s rate because it's really zippy, but not if it's going to get expensive in tooling and metal.
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