This is a complete video on adding a laser crosshair to zero out your X/Y axis. The total cost is under $40. I did the on my AVID CNC Router Parts Desktop Pro.
Mach3 Downloads
farhop 9mm Laser Mount Holder Bracket, Industrial Aluminum
Quarton Laser Module VLM-650-29 LPT Red Cross Line Laser Module (Line-Width optimize at Short Distance)
Battery Holder with On Off Switch Cap Lead Wires (for AA 4 CELL)
Handheld controller from Vista CNC http://www.vistacnc.com/b07_pendant_P1/pendant_M2.htm
Code I used
Xmove = +2.5622 ‘adjust this for X move distance
Ymove = -.0642 ‘adjust this for Y move distance
Code “G91 G0 X” &Xmove & “Y” &Ymove ‘ makes an incremental move the distances that you set
While IsMoving () ‘ waits while that happens
Wend
Code “G90” ‘goes back to absolute moves
DoOEMButton (1008) ‘zeros the X and Y DROs
DoOEMButton (1009)
source
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