Help please - Linear Scale only homing

Thanks, so the secret sauce I seem to be missing, is how to do index-only homing? On another axis I'm homing to home-switch+index so I see the homing latch on index only after the limit switch is found. Here I think I need to latch on the first (and only) index without first finding the home switch?

Ensuring we never try homing from the wrong side of the index seems like it should be easy on this machine. The operator is already required to park the machine with the upper beam on blocks before shutdown, which always puts it well under the index. I may also program a prominent warning into the GUI to display at homing, reminding the operator that the ram must be more than 1" down from top before homing.

NWE wrote:

Thanks, so the secret sauce I seem to be missing, is how to do index-only homing? 

Huh... maybe I just need to use the index signal in place of a homing switch. Sometimes the obvious is obscured by the thought pattern.

Using the index as home in hal is not what I meant, LinuxCNC does support homing to index:

linuxcnc.org/docs/html/config/ini-homing.html#_configuration

See homing type = index only
 

Perfect, thanks! I skimmed over that page too fast trying to find index only homing and overlooked that detail. I guess I was depending too much on searches which were not getting me anywhere.