Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: kolias on September 24, 2012, 02:06:21 PM

Title: MDI Input
Post by: kolias 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?

Title: Re: MDI Input
Post by: Hood on September 24, 2012, 04:17:41 PM

You have your steps per unit set incorrectly in motor tuning.
Hood

Title: Re: MDI Input
Post by: kolias 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? 

Title: Re: MDI Input
Post by: Hood 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

Title: Re: MDI Input
Post by: kolias on September 25, 2012, 02:43:58 PM

Thanks Hood, 5080 was the right number