Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: mannby on November 14, 2005, 07:52:54 AM

Title: Step loss on Mach3
Post by: mannby on November 14, 2005, 07:52:54 AM
Hello, I'm using the latest version of Mach3 and loosing one step everytime I change direction.
If I jog my machine with lowest resolution so I got only one step each time I press arrow button,
and press X+ and then X- then the axis moves only in one direction. But if I run the same thing
Mach2 then it works as it should. I have tried to play with step and pulse widht under motor tuning
maybe I could see a small improvement with a longer dir pulse but not enought.
What could be different between Mach2 and Mach3 with the step/direction function?

Best regards
Roger

Title: Re: Step loss on Mach3
Post by: Brian Barker on November 14, 2005, 09:00:57 PM
Roger,
What are you running for a drive? I think you are going to need to change the Pulse width to 5 and the Direction prechange to 5 on the motor tune page. If this isn't working please try the serline mode on the ports and pins page.

If that will not do it we are going to have to look deeper  ;)

Thank you
Brian
Title: Re: Step loss on Mach3
Post by: mannby on November 15, 2005, 06:45:41 PM
I hooked up my scope meter and saw that I had delay on rising edge after the
opto couplers, I changed some resistors and know it works perfect. :)
Then I discover that when I was using Mach2 my hardware missed every first
step in both directions, thats way it ended up right anyway.
Thats was tricky to find. ???

Thank you
Roger
Title: Re: Step loss on Mach3
Post by: Valis on September 12, 2014, 03:27:35 AM
Hi Roger
I have similar issue. I did not understand what you did to   make steps run correctly. Could you describe more for me? thanks a lot,
Valters