no option to home just Y axis on gantry with 2 Y motors

My table has no home or limit switches - I just zero G53 coordinates using homing and run programs from there.

The homing menu entry in the Axis GUI under 2.8.2 is only showing me options to home all, home X, or home Z.  No option to home Y.  See attached pic.

Is this something I can force-enable in the config files (latest rendition attached for my laser setup)?

Thanks,
David

I'll try changing those Y1 and Y2 HOME_SEQUENCE values this evening and report back.

Couple other questions:

1. What keeps the machine from trying to move and find home via switches?  The fact that my HOME_SEARCH_VEL for all joints is zero?  I don't have it explicitly defined for any joint, but zero is what it defaults to (per section 8.3.6.13 of the 2.8.2 documentation).

2. When LinuxCNC first opens up, is it in joint mode or axes mode?  I saw several references to joint mode in the 2.8.2 documentation, but they didn't explicitly answer this question.

 

No luck.  Tried them as both 0, both 1, both 2, and then one 2 and the other 3.

I also tried getting rid of the HOME_SEQUENCE lines, which changes the the Home All button to Home Axis (see attached screenshots and excerpt from documentation below), but when the Y axis radio button is selected, the Home Axis button does nothing.

(from 4.1.3.5 in the 2.8.2 documentation:

If not all axes have valid home sequences, the homing button will show Home Axis and will home the joint for the currently selected axis only. Each axis must be selected and homed separately.)

I don't see anything at the bottom of Axis for the joint/axes mode - it just has machine state (ESTOP, OFF, ON), tool, and position offset and feedback types.

That sounds like a PITA.  Could a "Home Y" button be added with GladeVCP?  It would need to (1) zero the G53 Y position and (2) mark that axis as homed.  Which doesn't seem impossible since Axis does that to the Y axis (along with the X and Z axes) when you press Home All.

Yes, to home a gantry axis by itself you can use the Halui pins "halui.joint.N.home" for all of the joints involved in the gantry axis. Simply net those together with the hal output pin from a VCP button or a real button. For example:
 

Cool - I will give that a try.

I created a UI in Glade 3.8.6-1 and saved it as "dbotos_laser_2_8_vcp.ui".  It has a button is there for homing Y and I also threw in a meter for percent full power of the laser.

I created an associated HAL file named "dbotos_laser_2_8_vcp.hal" and put the line in there suggested by Todd (with a modification for the button id).  I didn't put anything in there for the meter yet.

And, I modified my INI file as follows:

In the [DISPLAY] section, added:

In the [HAL] section, added:

When I tried to run LinuxCNC with my dbotos_laser_2_8 config, it gave the following error: