robot joint offsets required to overcome internal absolute encoder

Not sure HOME_OFFSET works with absolute encoders.

ftree wrote:

Not sure HOME_OFFSET works with absolute encoders.

It is certainly part of the calculation, though I would have to experiment to see what the result is as the description in the docs is a little unclear:
linuxcnc.org/docs/stable/html/config/ini...t__lt_num_gt_section
 

The simulation configuration at configs/sim/axis/vismach/melfa-sim uses : and

but I just checked the [TRAJ] HOME setting and using this might actually be preferable as that sets the zero pose (all joints at zero position) to be the same as is usually used in serial manipulator documentation:

And again your vismach model's inital joint (zero) positions need to be the same as what you had to rotate the joints to in order to derive the dh-parameters. ie if you had to rotate joint1 by 90° as in the dh-parameter documentation (due to the lack of theta parameter in genserkins) then your model's inital position needs to have its arm pointing to the floor and not straight out.

Will give it a try.

WIP

github.com/djsftree/linuxcnc_meca500/tre.../configs/sim-meca500

And again your vismach model's inital joint (zero) positions need to be the same as what you had to rotate the joints to in order to derive the dh-parameters. ie if you had to rotate joint1 by 90° as in the dh-parameter documentation (due to the lack of theta
parameter in genserkins) then your model's inital position needs to have its arm pointing to the floor and not straight out.

In hindsight should have used the melfa-sim/melfa.ini from the start.  Would have saved me a lot of time.

Making some progress now.

I could really do with someone that knows exactly what they are doing.  I'm happy to pay for a review and code changes to get me over the line.  I'm struggling with the last 1% of effort that is really hurting my brain and general wellbeing.

I'm trying all kinds of variations of the above advice. My latest is very nearly there. Please review if you have 15 minutes.

github.com/djsftree/linuxcnc_meca500