Adrian wrote:I zero my machine using the limit switches and then it set the XY zero as a fixed offset from there which lines up with the corner of the 8x4 sheet.
Basically loads of different ways to skin the cat.
Another option is to align the edge of the bit (tip of the flute when rotated perpendicular to the direction of approach) to your 0,0 mark and set it for 1/2 the bit diameter (rather than 0), plus or minus depending on which side of the mark you are on. Do it again in the other direction. When done a move to 0,0 should have the bit perfectly centered over your 0,0 mark.
If I know the exact dimensions of my board, and 0,0 is in the center, I'll align the tip of the bit to the edges of the board and set it for 1/2 the dimension (of the board) and 1/2 the diameter of the bit. Plus or minus depending on which side of 0,0 you are on. I've seen college students mismark center more often than not.
4DThinker wrote:I know LinuxCNC will let you type in any number when touching off each axis. I also know there is a SET option in the CNC Shark control software to let you do the same thing. You Mach3 users hopefully have the same ability.
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