toddkrein

So I added the heatsinks (which I thoughtfully ordered along with the grblshield), re-tuned the current pots (by making the arm move smoothly, and minimize the buzzing it made), and it works a little better.

took a floor fan, ran it over the board, and it ran much better.

But ultimately, it turns out that the reason the program was failing is that the feed rate (F400) makes the motors stall. I changed it to F100, and the cutting proceeded w/o a hitch.

When you say “reverse”, do you mean swapping A & B, or A & A’?

Sorry, wasn’t clear: The X-axis will move in both directions, but the movement is reversed, i.e., g0x10 cuts to the left, g0x-10 cuts to the right. That’s what I need to change, and thus my questions about setting up grbl’s configuration variables.

I can check it out on the scope, plenty of htem here in the lab. :-}