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Author Topic: MDI Input  (Read 2005 times)

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Offline kolias

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MDI Input
« on: September 24, 2012, 02:06:21 PM »
I started the testing of my cnc and I want to use fist the MDI window for safety reasons

So I zero the DRO and I type G00 Y12.0 (for 12”) but the axis keeps going past the 12” by a lot

I type G00 Y1.0 (for 1 foot) and the axis stops at about 5”

My units are set for inches, so how I should type inches? Perhaps in decimals?
Nicolas

Offline Hood

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Re: MDI Input
« Reply #1 on: September 24, 2012, 04:17:41 PM »
You have your steps per unit set incorrectly in motor tuning.
Hood

Offline kolias

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Re: MDI Input
« Reply #2 on: September 24, 2012, 06:59:24 PM »
My ballscrews have 10mm Lead or Pitch and the G540 driver has 10 microstep drivers

When I follow Mach3 manual par 5.5.1.2 & 5.5.1.4 the above should give me 4000 which I put into the box “Steps per” in the motor tuning screen.

But 5.5.1.1 says for a 2mm pitch screw: (screw revs per unit) = 1 divide by 2 = 0.5 revs/mm and in my case with 10mm pitch I get 0.1. Where do I put this number? 


Nicolas

Offline Hood

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Re: MDI Input
« Reply #3 on: September 25, 2012, 02:53:56 AM »
If the steppers are direct drive, ie no gearing the number you want is
200 x 10 /10 = 200.

Assuming of course you are set in metric units, if set in Imperial native units then the number you want is 25.4 times that, so 5080.

Hood

Offline kolias

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Re: MDI Input
« Reply #4 on: September 25, 2012, 02:43:58 PM »
Thanks Hood, 5080 was the right number
Nicolas