image = Grbl4crp850r0.3.png |designers = [[User:Tim|Timothy Schmidt]] |date = 2020 - 2021 |vitamins = |materials = |transformations = [[Etching]], [[Photopolymer printing]], [[Soldering]] |lifecycles = |tools = [[Soldering irons]], [[Multimeters]] |parts = [[Printed circuit boards]], [[Solder]], [[Headers]] |suppliers = [https://www.replimat.org/product/cnc-controller-avidcnc/ Replimat] |techniques = |files = [https://github.com/timschmidt/replimat/blob/master/src/Fritzing/grbl4crp850.fzz?raw=true grbl4crp850.fzz] |git = [https://github.com/timschmidt/replimat Replimat] |standardinterfaces = [[Arduino]], [[Parallel port]]

Parts Electric parts Controllers

=Introduction= A simple board to control [https://www.avidcnc.com/ AvidCNC] equipment using Free Software. Replimat has developed and tested this against our Avid CNC 60120 Pro.

=Challenges= The avid controller requires more pins than [https://github.com/grbl/grbl grbl] provides, so [https://github.com/fra589/grbl-Mega-5X grbl-Mega-5X] was used instead.

=Approaches= Verified as of revision 0.3: machine travel in the X, Y, Z, and mirrored axes, in positive and negative directions, as well as homing and endstop sensors.

Enabling additional functions may require some minor modifications. Unused signals have been routed to a breakout header for easy access. <gallery> Grbl4crp850 r0.1 w-bodge wires.jpg|revision 0.1 w/bodge wires Grbl4crp850r0.2.jpg|revision 0.2 Grbl4crp850r0.3.png|revision 0.3 </gallery>

The grbl4crp850 drops directly in to [https://www.avidcnc.com AvidCNC] control cabinets built around the [https://www.avidcnc.com/support/instructions/electronics/pnp/manual/20.1/schematics/ CRP850 breakout board] allowing you to replace the built in [https://www.avidcnc.com/ethernet-smoothstepper-p-229.html EthernetSmoothStepper] and Mach4 with an Arduino Mega running [https://github.com/fra589/grbl-Mega-5X grbl-Mega-5x] machine control firmware and your choice of host [https://wiki.replimat.org/wiki/Software software].

Verified as of revision 0.3: machine travel in the X, Y, Z, and mirrored axes, in positive and negative directions, as well as homing and endstop sensors.

Enabling additional functions may require some minor modifications. Unused signals have been routed to a breakout header for easy access.

=Making changes= This adapter PCB has been designed using the Open Source [https://fritzing.org/ Fritzing] software. Traces have been hand routed.

=References= * [https://www.avidcnc.com/support/instructions/electronics/pnp/manual/ AvidCNC: Electronics technical manual]