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12 Feb 2021 01:08 #198468 by jnwinkie
Replied by jnwinkie on topic Next steps
Thanks all;
0.25W resistors good enough?

Thanks

John

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12 Feb 2021 01:12 #198469 by rodw
Replied by rodw on topic Next steps
I'm sure thats fine. Pretty sure we are talking micro amps not even milliamps.
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15 Feb 2021 00:51 #198887 by jnwinkie
Replied by jnwinkie on topic Next steps
Hi Rod;
What math led you to 5000 steps? What Amps?
Just curious.
Cheers
John

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15 Feb 2021 01:13 - 15 Feb 2021 01:13 #198888 by rodw
Replied by rodw on topic Next steps
When I got my 7i76e, I played to see how high a frequency I could get to by tweaking the step settings
Then I backed off a bit and settled on 25x microstepping.
People say you loose torque but I never noticed.

I think that is obsolete advice with modern stepper drivers Just my uneducated guess.
Last edit: 15 Feb 2021 01:13 by rodw.
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15 Feb 2021 01:48 #198892 by jnwinkie
Replied by jnwinkie on topic Next steps
Thanks Rod;
I designed a 4:1 reduction based on TommyLight's recommendation. I will start with 3200, which in theory should give me (.787) 20mm with a 4:1 reduction (Pi 3.1417) 3235.7224.
What do you reckon. Make sense?
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16 May 2021 08:39 #209053 by RNJFAB
Replied by RNJFAB on topic Next steps
Hey John,
Keen to see how your machine is running and the Unimig setup. Going down this route now.
Cheers

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