Hello all,

           my y axis is driven by two motors. One on each side. I have Y slaved to A.  I notice that when I jog from my soft limit position the one side initially steps before the other. Then after the gantry is moving all seems ok. I don't have home/limit switches yet, do I need them so mach knows where the A axis is in relation to the Y axis?  Also I copied all the settings from the Y axis  and pasted them in the A axis in motor tuning. So I know the Y and the A axis are stepping the same. Any ideas? Thanks.

Charlie

Do the Y and A have the same softlimit settings?

 Hi ger21,

            Thanks for the reply. I did not set the softlimit for A. Thanks. I will do that.


Charlie

 OK So I set the A axis home, limits the same as the y. I get now get raking when I jog. I can see the left side(Y) step before the right side(A). Do I need to adjust the A motor tuning so I don't get racking? I thought if the Y and A motor tuning numbers were the same then all should work.

Can you post your .xml file?

Hi Gerry,

            Here is my xml file. Thanks for the help.

 Hey Charlie,
  That XML is empty.
Maybe the wrong one ?

Russ

Sorry. Here is the correct one. Just remove the Dot txt and it should be ok.

Are you using the parallel port, or a motion controller?
What stepper drives?

Everything looks OK, except your pulse widths set to 0. Try setting them to 5 and see if it makes a difference?

Hi Gerry,

          I am using a hobbycnc pro driver board. 4 axis. I will try that. Let me ask you something. I read on a forum that I have to have two limit switches on the slaved axis in my case it would be the y axis. After homeing Y then the Slaved axis touches off the limit switch and then mach can sync the two axis. does this sound right?