Thread: New mill, which motors?
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Gosh I am out of date. Mind you, the power feed I am rewiring uses a DIAC for the speed control so I am not completely passed it
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21-12-2020 #22
Yes, I remember them. Presumably used in the gate of a triac or scr, then. That dates the controller, as that threshold function has been built into triacs for many years now. I'd guess 1980s, most likely.
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1980's? Warco sold it as new
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22-12-2020 #24
Perhaps an SCR drive then, as SCRs don't have a 30V threshold on them. But even so, the market for diacs is very limited these days.
What's it driving? Is it a triac or an SCR?
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SCR that's the beastie, my ageing brain has obviously succumbed to the barrage of transient ischaemic attacks.
Fortunately, I can still understand how the circuit works even if I can no longer name the individual components
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Motors and PSU have arrived, I wasn't actually expecting them before 10/1/21
Look great, comfortably heavy.
I read the manual and just when I thought it must be reaching the bit about the USB connection it suddenly stopped, repeated itself in German and ended.
Guess you aren't supposed to use that part
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23-12-2020 #27
Good luck mate.
Upto about 100$ some steppers are ok for better stuff.
After that, ac brushless servos are the right choice - about 5-7x better by every possible measure.
About the same money, all-in.
Lets see how it works out for you.
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24-12-2020 #29
I had large cast iron wheels like that on my Bridgeport. I couldn't get a decent response from the DMM servos until I removed them. Their moment of inertia was much bigger than the ballscrew itself and the reflected inertia of the table and vise, particularly on the X axis which had 2 of the buggers. As I have an MPG, turns out I never use the handwheels anyway but your solution would be a pragmatic middle way.
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Oh yes, don't give up on your handles, I am fighting to keep the dials. What is MPG? Miles per gallon doesn't seem to fit the context
Not fighting to keep these ghastly, spring-loaded, press in before you can turn it handles though.
New handles need paint - wondered if aluminium coloured paint existed - had forgotten about alloy car wheels - spoilt for choice
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