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dguerizec / grbl-Mega-4axis

An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560
https://github.com/gnea/grbl/wiki
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Using X and A for dual motor gantry #6

Open blallen62 opened 4 years ago

blallen62 commented 4 years ago

Hi, how do I go about using the A axis as my second motor on a dual motor gantry setup on the X axis? I'd like to be able to home the two motors independently in order to square the gantry automatically.

tpaszkiewicz commented 4 years ago

I would also love to get an answer. I'm struggling with it for days. For now, i have two motors on one pin but it's impossible to easily square the gantry, as @blallen62 said. @dguerizec can we ask for advice? thank you

dguerizec commented 4 years ago

Well, grbl is not designed to do this alone. For double axis homing, you'd have to use an external program, but I don't know any that works with grbl. I now personally use linuxcnc to control my CNC and grbl is only for my 3 axis, 3 steppers laser engraver.

blallen62 commented 4 years ago

Since originally starting this thread I've just given up on dual axis with grbl. I just have a single pin on the mega tied to two stepper drivers. I square it every once in a while manually and have $1=255. It's good enough for what I'm doing now.