Configurate Slave Axis

that's right is not really a 4th axis....

but is connected in other pins than Yaxis

im gonna try what JT said

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.

I will try that and let you know if it worked.

I too am looking for a solution to drive this two steppers on a gantry axis configuration. I would have thought this would be common enough to have a solution implemented already (having been away from EMC for about 10 years). One configuration of the machine parts I have has two steppers and two home switches. So there is no built in code to home and check both switches for skew, missed step accumulation and fix it automatically? Slaving two drives together off common outputs is not going to cut it. Please tell me I am not going to have to write code before I can use EMC.

Hi

I do not have 2 motors on one axis..... But i read that problem quite often. Here a hack I'd do it.

Use two configs.
In the first you have only the two axis (x/y) you want to home. U use this only in case you fear to be none square!
With normal g code run both slowly into home=end switch. G1 Fslow Xbig Ybig. Until one of the switches produce the expected error.
Then retract both axis parallel a bit out of switch. Than hit home button.
Home first x than y . Slowly in short distance so you do not bent too much.

After that you use the normal configuration with one home switch and parallel end switches..
See no reason to square again if you only want to find home position.

My 5 cents.
Mike