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slaving
« on: February 02, 2015, 09:25:06 PM »
 
Hi Everyone
I am very new to the cnc / Mach3 world about a month.
I am building a cnc router that has two stepper motors on the same axis.
I have read the instructions from Mach3 and in this case slaved my y axis to the A axis, no problem.
Both motors turn in the same direction but they are not in sync with each other.
I have 2 home switches on each side of the gantry, according to the instructions when I zero the Y one side of the gantry with hit the home
switch, stop and back off and the Y does just that but the A hits its home switch and keeps traveling.
I have tested the home switches by the LED's on the diagnostics screen to confirm they work.
Can anyone please help ??
Thanks Richie.
__._,_.___
 8)

Offline ger21

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Re: slaving
« Reply #1 on: February 03, 2015, 05:18:36 PM »
What do you mean by "not in sync"? Do they move at different speeds?
Can you post your .xml file here?
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: slaving
« Reply #2 on: February 03, 2015, 07:54:05 PM »
Thanks Gerry
What I mean is that my gantry is racking because the motors are slightly different speeds .
So the gantry racks by as much as 1/2 " per every 4"n of travel.
Motor setting are exactly the same and the second motor (A)  is slaved to the ( Y ) in this case .

Offline ger21

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Re: slaving
« Reply #3 on: February 03, 2015, 10:32:56 PM »
Is this all the time, or only when homing?
If only when homing, make sure the homing speeds are  the same in Config >Homing and Limits.

If it does this all the time, I don't have an answer for that, as I've never seen that happen.
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: slaving
« Reply #4 on: February 04, 2015, 07:30:16 AM »
OK thanks Gerry but it happens any time I jog that axis.

Offline ger21

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Re: slaving
« Reply #5 on: February 04, 2015, 08:00:42 AM »
Are you sure the speeds are the same. Both velocity and acceleration in motor tuning?
If they are, I'd uninstall and then reinstall Mach3.
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: slaving
« Reply #6 on: February 04, 2015, 08:20:45 AM »
Might also verify that both are mechanically identical.
Exact same pulleys, screw pitch, rack/pinion or whatever applies.
Russ
Re: slaving
« Reply #7 on: February 04, 2015, 09:23:47 PM »
Thanks Guy's I will keep trying .