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Author Topic: I want to move 1 inch but move 5 total beginner  (Read 439 times)

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I want to move 1 inch but move 5 total beginner
« on: July 28, 2019, 08:24:21 PM »
I am a total beginner to cnc.  I figured it would be easiest to build a cnc plasma table.  I have mach4 and the PMDX 416.  All of my movements are about 5 times larger than I want.  I tried jog and set incremental to 1.000 inch and it moves 5 inches.  How do I correct this problem?  My stepper motors have a pulley that runs a belt connected to the gantry for moving the X and a stepper motor with a pulley connected to move the Y axis.  The pulleys are about 2.5 inch in diameter.
I cannot find any place to change the distance the thing moves.   
Re: I want to move 1 inch but move 5 total beginner
« Reply #1 on: July 29, 2019, 03:17:23 AM »
Hi,
the adjustment you require is called 'counts per unit' and can be found on each of the axes you have installed.

What values have you set in the different motor tuning pages now?

Craig
My wife left with my best friend...
     and I miss him!
Re: I want to move 1 inch but move 5 total beginner
« Reply #2 on: July 29, 2019, 10:40:17 AM »
Thanks for the reply.  It is set at 1000 as in your screen shot.  I think I tried to change that and could not.
Re: I want to move 1 inch but move 5 total beginner
« Reply #3 on: July 29, 2019, 11:51:20 AM »
You need to click on one of the Motor labels on the right and highlight the one you wish to edit.
Steve Stallings
www.PMDX.com
For PMDX product support, please use PMDX forum or direct email for quickest response. We do not use this forum as our primary product support site.
Re: I want to move 1 inch but move 5 total beginner
« Reply #4 on: July 29, 2019, 03:16:40 PM »
Thanks for the reply.  I intend to work on it again today sometime.
Re: I want to move 1 inch but move 5 total beginner
« Reply #5 on: July 29, 2019, 04:50:40 PM »
Hi,
use MDI to move an axis one inch and then measure (accurately as possible) how far it actually moved.

Then change the <counts per unit> to:

<counts per unit> =1000 / distance moved

Once the change is made it may well pay to restart Mach to ensure that the change is flushed to the .ini file and that
your controller firmware is updated as you restart.

Craig
My wife left with my best friend...
     and I miss him!
Re: I want to move 1 inch but move 5 total beginner
« Reply #6 on: July 29, 2019, 05:12:40 PM »
Thanks for the reply.  I will keep that in mind.
Re: I want to move 1 inch but move 5 total beginner
« Reply #7 on: July 29, 2019, 06:20:48 PM »
 ;D  OK guys that got it right on the money.  From here I will see what else can be done to make it perfect but so far you have fixed my problem.  Thanks again for all the help.