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Author Topic: Setting "Steps Per" Rack & Pinion machine.  (Read 1733 times)

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Setting "Steps Per" Rack & Pinion machine.
« on: October 09, 2014, 01:46:51 PM »
Hi All,

First of this might seem a daft question but I just can't get my head round it.

I'm trying to re-fit my Chinese router with Mach 3 as controller. The machine has Rack and pinion X and Y axes with 20 tooth pinion (I believe Mod 1.25) driven by 5:1 reduction and 1600 micro-steps per rev motors. The existing controller (NcStudio  >:() is set up to 0.01042mm/step. This suggests that steps per mm are 1/0.01042 which is 95.9692898273
Surely I cant set this figure in "Steps Per" in the motor tuning screen.

What am I missing?

Many thanks,

Bob.
« Last Edit: October 09, 2014, 02:04:40 PM by cncbobuk »

Offline Hood

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Re: Setting "Steps Per" Rack & Pinion machine.
« Reply #1 on: October 09, 2014, 02:50:53 PM »
I don't think you are missing anything, not checked your calcs but if that is the number you come up with just enter it. I think Mach allows up to 8 decimals in motor tuning, should get you close enough with such a setup :)
Hood
Re: Setting "Steps Per" Rack & Pinion machine.
« Reply #2 on: October 09, 2014, 02:59:53 PM »
Thanks Hood, I'll give it a try, just don't understand how the system can send anything other than a whole number of steps.

Ah................ just worked out 96 steps would equate to 1.0006327978 mm I think I can accept that degree of error.  ;)
« Last Edit: October 09, 2014, 03:05:01 PM by cncbobuk »

Offline Hood

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Re: Setting "Steps Per" Rack & Pinion machine.
« Reply #3 on: October 09, 2014, 03:02:36 PM »
It can't, it just gets as close as it can. It will however keep track of all decimals so will never be further out than one step.
Hood
Re: Setting "Steps Per" Rack & Pinion machine.
« Reply #4 on: October 09, 2014, 03:06:00 PM »
All clear now, thanks