Configurate Slave Axis

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20 Sep 2012 15:13 #24458 by fedemecanica
hey guys, im new in this forum, and i've been reading a lot, but i cant find a solution.

i have a Router CNC, whose "Y" axis has two step motor.

i used to use the CNC with windows XP and mach 3, and worked fine. in match i just had to configure axis "A" Slave from "Y"

but i cant do the same in EMC2.
what's the solution????

i've read that i can do a slave axis, by wiring in a particular way, but it doesnt work for me...

Thanks!!!

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20 Sep 2012 15:21 #24461 by BigJohnT
Replied by BigJohnT on topic Re:Configurate Slave Axis
If you used the Stepconf Wizard to generate your configuration and your second drive is connected to separate pins on your parallel port just pick Y Step and Y Direction for the pins connected to your second motor.

If not tell us more about your setup.

John

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20 Sep 2012 15:25 #24463 by fedemecanica
in my configuration i have 4 axis, each one in different pins

thanks for the quick answer

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20 Sep 2012 15:47 #24468 by andypugh
Replied by andypugh on topic Re:Configurate Slave Axis
fedemecanica wrote:

in my configuration i have 4 axis, each one in different pinsr


I am not clear from this reply if you have tried what JT suggested, or not?

But, if you wanted, you could set every pin on the parport to Y-step. It would be silly, but Stepconf allows it.
If the motors need to run in different directions, just swap the A-phase wires with each other.

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20 Sep 2012 16:02 #24472 by fedemecanica
A axis, and Y axis, should run exactly the same way....
becuse it's a huge CNC that needs 2 steps motors, to run the same axis

i haven't tried JT's solution yet, i'll do in a few minutes

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20 Sep 2012 16:30 #24482 by andypugh
Replied by andypugh on topic Re:Configurate Slave Axis
fedemecanica wrote:

A axis, and Y axis, should run exactly the same way....
becuse it's a huge CNC that needs 2 steps motors, to run the same axis


It's not really an A axis, it's a second motor on the Y axis.
It is rather common for the two motors on a gantry to need to spin in opposite directions, as they tend to be mounted as mirror images of each other.

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20 Sep 2012 16:34 #24483 by fedemecanica
that's right is not really a 4th axis....

but is connected in other pins than Yaxis

im gonna try what JT said

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28 Dec 2013 00:29 #42067 by Pysiek
Replied by Pysiek on topic Configurate Slave Axis
I have same problem here. Except I use two motors and two ballscrews to run my Y axis. This setup preventing bending. I use Mach3 trial version and would like to try Linuxcnc also. How do I slave the two motors together? I Mach3 it was very easy but in LinuxCNC I do not see an option. Both motors are connected to separate pins on my breakout board.

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28 Dec 2013 02:01 #42069 by andypugh
Replied by andypugh on topic Configurate Slave Axis

How do I slave the two motors together?


To _literally_ slave the two motors together, allocate Y-step and Y-dir to both sets of pins.

The complications arise when you want to auto-square to the limit switches, and if it is absolutely necessary to _never_ rack the gantry at all.
It then becomes really complicated if you have encoders with index, and horrible if the indexes are not aligned.
If we ever work out the perfect way to home a gantry then I think we will see it implemented as an automatic behaviour.

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28 Dec 2013 02:30 #42071 by Pysiek
Replied by Pysiek on topic Configurate Slave Axis
I will try that and let you know if it worked.

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