Help with dual steppers on y axis and config

aH.... my bad, I am in 2.9.

andypugh wrote:

hartley942 wrote: I am having difficulty getting two steppers on the (gantry) Y axis to run in parallel. I have changed the settings as detailed in the 2016 discussion "Help with dual steppers on y axis and config". I just installed a Gecko g540 controller, however I had the same problem with a DIY stepperonline controller that was previously installed.

I thought that Stepconf knew how to configure gantries, but having tried it, it seems not.

Use stepconf to set up an XYZA machine.

Then open the INI file in a text editor.

Delete the [AXIS_A] section and the [JOINT_3] section
Make a copy of the [JOINT_1] section under [AXIS_Y] and rename it as [JOINT_3]

Give both joint 1 and joint 3 the same home sequence number, and make it a negative number. Probably -1 or -2.

Edit [TRAJ]COORDINATES = XYZY
Edit [KINS]KINEMATICS = trivkins coordinates=XYZY kinstype=B

That should be it. (though assumes a dual-Y setup, if you have a dual-X then it will look slightly different)

You running 2.8 or 2.9?
2.9 has it built in the wizard stepconf. select tandem Y instead of A. If your in 2.8 then you should do whatr Andy said.

On 2.9/master

Tandem joints for StepConf were added to master only and are limited to the X and Y axes.
github.com/LinuxCNC/linuxcnc/commit/f213...27a402ba6ec66ea54dfc

how i update cnc 2.8.4 to 2.9 can add dual Y axis,
2.8 not working has try many many different forum help example all only error lot and not working newer, and home button not working at pc display, not have homind all axis or homing Y normal XYZ have and work good. but if add dual Y not working. i has write copy joint 3, joint0=X, joint1=Y joint3=Y2, joint4=Z copy same text joint1 and added joint2. not newer has working. and not can use cnc because need first all axis homing, but not can do this because not have homing buttons active and Y homing button has hide somewer not haveat display. only lot come errors to display not do anythink,