Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: aljolley54 on January 13, 2010, 11:53:33 PM

Title: Hesitation in jog, G0 upgrade problem
Post by: aljolley54 on January 13, 2010, 11:53:33 PM

I just upgraded my router from Mach3 1.84 to 2.66 now when I jog both the x or the y there is a hesitation. The Router will move about 6 inches, slow way down to almost zero, then accelerate to the correct velocity for the rest of the move. This also happens in G0 moves. Did not do this before the upgrade??????????

Title: Re: Hesitation in jog, G0 upgrade problem
Post by: Hood on January 14, 2010, 03:38:19 AM

can you attach your xml please.
Hood

Title: Re: Hesitation in jog, G0 upgrade problem
Post by: Mac The Knife on January 14, 2010, 09:16:01 AM

Sounds like backlash compensation.  There is an additional setting somewhere in Mach to speed up the process.

Title: Re: Hesitation in jog, G0 upgrade problem
Post by: Mstcnc on January 14, 2010, 11:32:14 AM

You need to check "Shuttle acceleration" value, if too big it will make backlash act as you noticed. I have servo motors and can use value like 0.01 but stepper maybe need more, depends your machine....

-Mstcnc

Title: Re: Hesitation in jog, G0 upgrade problem
Post by: aljolley54 on January 14, 2010, 03:30:40 PM

Thanks. The problem was in the backlash and shuttle speed. Not sure I have it optimized but do have it working.