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Gantry Racking
« on: March 15, 2015, 04:36:43 PM »
 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
Regards
Charlie M.

Offline ger21

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Re: Gantry Racking
« Reply #1 on: March 15, 2015, 05:49:54 PM »
Do the Y and A have the same softlimit settings?
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Gantry Racking
« Reply #2 on: March 15, 2015, 07:00:18 PM »
 Hi ger21,

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


Charlie
Regards
Charlie M.
Re: Gantry Racking
« Reply #3 on: March 15, 2015, 08:01:48 PM »
 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.
Regards
Charlie M.

Offline ger21

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Re: Gantry Racking
« Reply #4 on: March 15, 2015, 08:58:54 PM »
Can you post your .xml file?
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Gantry Racking
« Reply #5 on: March 16, 2015, 06:02:17 AM »
Hi Gerry,

            Here is my xml file. Thanks for the help.
Regards
Charlie M.
Re: Gantry Racking
« Reply #6 on: March 16, 2015, 07:24:08 AM »
 Hey Charlie,
  That XML is empty.
Maybe the wrong one ?

Russ
Re: Gantry Racking
« Reply #7 on: March 16, 2015, 05:23:29 PM »
Sorry. Here is the correct one. Just remove the Dot txt and it should be ok.
Regards
Charlie M.

Offline ger21

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Re: Gantry Racking
« Reply #8 on: March 16, 2015, 05:59:09 PM »
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?
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Gantry Racking
« Reply #9 on: March 16, 2015, 06:27:45 PM »
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?
Regards
Charlie M.