New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Neale]

I used the holes-at-corner-of-100mm-square technique to set up my gantry, and it's surprisingly sensitive to small errors. We're not talking super-accurate toolroom standards here, but for woodworking use it's more than good enough. I used a 6mm drill to make the holes and then 4 more with shanks inserted in holes as dowels. A digital caliper is pretty much essential for this as it's difficult to read a vernier caliper when it's in the middle of the bed.

I wrote a little bit of gcode to drill the holes so that I could guarantee approaching each hole in the same direction to take any backlash out of the equation.