Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: cncbobuk on October 09, 2014, 01:46:51 PM

Title: Setting "Steps Per" Rack & Pinion machine.
Post by: cncbobuk 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.

Title: Re: Setting "Steps Per" Rack & Pinion machine.
Post by: Hood 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

Title: Re: Setting "Steps Per" Rack & Pinion machine.
Post by: cncbobuk 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.  ;)

Title: Re: Setting "Steps Per" Rack & Pinion machine.
Post by: Hood 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

Title: Re: Setting "Steps Per" Rack & Pinion machine.
Post by: cncbobuk on October 09, 2014, 03:06:00 PM

All clear now, thanks