I have a machine with two slave steppers on the main axis.
I have slaved X and A and installed home switches on both.
I have set the A axis to linear.
Using manual control the pair of slaved axis move OK and remain in step but:

1.  When I use to 'Go to Zero' command, the axis remain in step but move in 'bursts' of about one second/30mm.
2.  When  using 'REF ALL HOME' the Z and Y axis do the correct thing (touch the home switchs and then back off) but the X and A axis do odd things - one touches/backs-off, the other touches,reverses and keeps going in the wrong direction.

I have very carefully checked:
1. Pulse rate and varied it from 25KHz to 100KHz and it makes no difference.
2. All the ACHIVE_HIGH/LOW, DIRECTIONS, PINS and PORTS.

Any help would be very welcome.

Regards Bill Legge

Do you have "Home Slave with Master" Unchecked in General Config?

Are both axis Homing Speed the same in Config > Homing/Limits?

Can you post your homing script, and your .xml file?
To get the homing script, go to Operator > Edit Button Script and click the ref all button

ger21

Thank you.  I had not spotted the 'HOME SLAVE WITH MASTER' check in the General Config.  That must be my problem; I'm very grateful as I was almost giving up and going to spend a long time re-building to use a single stepper.

Any ideas about why the 'GO TO ZERO' causes 'jerky motion' on the pair of slaved axes?  A few notes:

1.  The jerkiness only occurs on the slaved pair of steppers.
2.  I've tried uncoupling the motors from the machine in case it was excessive mechanical stress - but it makes no difference.
3.  The slaved pair run smoothly/easily under manual controll (using the 'HOT KEYS') - so it would not seem to be driver/power supply problems.

What on earth could be the difference between HOT KEY/MANUAL control and GO-TO-ZERO ?

The only slightly unusual thing is that I'm using a lap-top pc - but it's an old one and has a proper printer port.  Could the lap-top be running out of processing power; but then why would the manual mode work OK?

Regards Bill Legge