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I also need to stop using google to find linuxcnc docs, rather than having some known-good bookmarks on hand. Not only does google often point to old versions of the docs, it will also take you into the middle of the document. While I'd read most of the page @PCW linked to, I think I'd never even seen the first several sections, with the excellent colorful diagrams. Wish I had!

Detecting the drive pin could also cause parameter tracking issues if an anomaly happens.

Maybe detecting pocket pins on each index and a homing pin is better.
And just make the motor stop with a slight delay, so the geneva drive fully engages.

By e.g using M65 P4 Qxx in subroutines.

Grotius wrote:

Hi Rod,

You mean adding the cmake project into the original makelists.txt file and build it from there is the way to go?
I did not test that option.
 

I don't know anything about make or cmake but yes, just use cmake for the emc/src/planner folder. 
I noticed that Linuxcnc uses submake files for each folder in src/emc but you don't seem to do that.
Also because you mention motmod.so and liblinuxcnchal.so I assume you have modified the code in other modules. If that is the case, is there a way that planner can specify what it needs to use at run time so these modules can be used with both tpmod and planner?

It would be so cool to incorporate this into the base code and if it is modular as the original designers of Linuxcnc intended, it wont break anything existing.. and  it becomes available to everybody.

Thank you both. I'm certain you're right: Home is set to 0. So if I switch to homing at the 12,12 corner, and change HOME to 12 for both X and Y, it will almost certainly do what I want. INI file attached, in any case.   If HOME had been grouped with the other HOME_* variables, I might have noticed. 

I used Argon drives on a retrofit, they are very good and have nice software for setting them up, good documentation too.
You do need a dongle though, and the comms between dongle and drive have a hard coded speed that can not be changed, so might have issues. Use good USB cable.