Thanks!  There is talk about porting the original code to work on 
GRBL-ESP32( by Bart Dring ) but it ends up being almost the same as the 
Arduino in that the system
requires another computer to work with the robot.  An embedded computer 
like RaspberryPi and BeagleBone Black means the controller is also the 
computer so it
becomes more of a self contained machine.  I think it's still up in the air 
as to which way the upgrade will go and I'm just trying to help them along 
with my little knowledge
of Machinekit's capabilities( still have a delta/Mini Kossel 3D printer 
running Machinekit/CRAMPS ).

BiPod, great and thanks.  I found the git repo of the museum piece Matthew 
Venn and while it's not using DC motors and encoders, it's very close as it 
uses encoders
with stepper motors.

Thanks for the very useful information!

BTW, if you don't know about Maslow CNC, it's a 3 axis bipod router which 
does full sheet( 8' x 4' ) routing where the router is hung and 
weighted(with 2 bricks ) and
the kit and router costs < $600.  Another nice feature is that because it's 
a bipod/hangBot its foot print in the shop is very small compared to a 
horizontal full sheet CNC.

Doug

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