Help with pinout. 2 motors (joints) on one axis. 2.8

joel0407 wrote: Hey Rodw,

I think you mentioned somewhere that many use XYZA in Stepconf then change the config files. That's going to be a bit confusing as well as stepconf creates the A axis as a rotary axis.

I still think it's going to be easier just to create XYZ, copy and paste one of those axis and make appropriate changes. One for me will be bumping along the joint numbers as XYZ will be joints:

Yes, thats what I did. The sooner you get your head around hand editing hal and ini files the better I reckon!

rodw wrote:
The sooner you get your head around hand editing hal and ini files the better I reckon!

Yep, agree. I find it difficult with the manual trying to appease both audiences, the GUI and the command line. The GUIs aren't up to scratch at all for 2.8. They seem way behind. It's pretty evident with the first option for machine configuration in stepconf where it only gives 4 options (I think, at work and don't have it in front of me). There is no option for anything with 4 linear axis. It's pretty limited to standard basic cnc machines.

Happy Days

Hey guys,

I'm getting there. My problem now is, if I have anything other than

[KINS]
JOINTS = 4
KINEMATICS = trivkins coordinates=XYZA

in my INI file. I have problems.

If I have:

[KINS]
JOINTS = 4
KINEMATICS = trivkins coordinates=XXYZ

I can't get movement on the X axis

Or

[KINS]
JOINTS = 4
KINEMATICS = trivkins coordinates=XYYZ

I cant get movement on my Y axis.

When I run LinuxCNC. Which ever axis is not working is just skipped. If X is not working, left and right keys do nothing, Up and Down move the X axis and Page Up and Page Down move the Y axis without the Z.

Same if Y is not working, X keys move X, Y doesn't move with up and down keys but it does with page up and down.

You can't jog a slaved axis until after it is homed. (This is because they are not really slaved together until after homing is completed.)

Todd Zuercher wrote: You can't jog a slaved axis until after it is homed. (This is because they are not really slaved together until after homing is completed.)

Thanks Todd,

I'll have another crack when I get home in the morning (at work now).

Makes sense but I'm surprised that the jog skips it with the controls. So once it's homed, will it return to normal jog controls, arrow for X and Y then PGUP and PGDN for Z?

Jogging is disabled for the doubled axis, because trying to jog it would only move one side, racking your gantry. For this reason a gantry must have automatic homing configured for the master and slaved joints at a minimum.