PathPilot robot

Using ROS is one possibility to use Linuxcnc with robots. ROS does all the kinematics, simulation and visualization and then sends the joint commands to linuxcnc. Linuxcnc IS already capable of handling most of what is needed for basic handling of robotic arms but compared to commercial controllers' capabilities it's a _lot_ more limited than say even a 5 axis milling machine. Basically all the innovation is in the math hidden inside the controllers.
I don't see a lot of development going on in LinuxCNC when it comes to robot manipulators. One important step was the switch-kins branch but that was not accepted to merge into the master branch so you have to build your own. Unless there is a mechanism to switch between joint and cartesian kinematics in gcode it's fairly pointless to use linuxcnc with a serial manipulator. But, as machinekit, has shown using ROS to do the math is one way to do it.
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One reason that robot development is not really pursued here is that the manipulators themselves are expensive even without the controllers and the fact that they are not really all that useful for a hobbyist or small shop owner. Those things are built for _very_ repetitive tasks and having a CNC lathe or mill or plasma router will get you a _lot_ more return for the investment than a robot.

And yes I have TWO of them.
To play with.

Nice, both of you.
Thanks.

There are drivers to connect ROS to various Robot controllers. There is one that connects ROS to my working mitsubishi RV-3SDB and I can drive that from moveit just fine.
How exactly machinekit has plugged ROS and Linuxcnc together I don't know but really all you have to do is communicate the joint positions to LinuxCNC and possibly send the encoder positions back to ROS.

Industrial manipulators and CNC mills are very different beasts

_Very_ true and a fact that many people don't realize, including me, until they get a chance to actually work or play with one. Just the fact that the kinematic itself comes with major stumbling blocks like singular points where the inverse kinematics math just folds is a very novel thing to have to work with.

user Grotius is using the KDL library to build a application that plugs into Linuxcnc.
forum.linuxcnc.org/38-general-linuxcnc-q...-c-c?start=80#191018

So since you have experience with ROS, can ROS or the Kinematic libraries do Tool Coordinate Moves?
forum.linuxcnc.org/10-advanced-configura...ics-to-robots#159066

Side info:
Having worked with industrial Kuka robots, the amount of parameters and settings and constraints and interlocks implemented is astonishing.
So being able to control such machine with LinuxCNC with a week or two of effort is also astonishing, and is a testament to the flexibility of LinuxCNC.
Of course it does not have everything the industrial ones have, but industrial ones do not have everything sorted out either, check "singularity" as it is still an issue with them.