Newbie question.
After homing Pro XXL, shouldn’t the machine be at zero. My X and Y are reading-0.118.
Thanks
Each axis backs off a bit after homing to pull away from the switch. The hard home point is 0.0
3 Likes
The homing zeros are the internal coordinates of the Shapeoko. When you set your X Y and Z for a project the internal coordinates are offset to show your current X Y and Z you set. The homing sequence goes until the proximity switch is triggered and then the axis moves off that. It used to be 6MM but it is not important because the firmware handles that. So when the homing switches are triggered that sets the internal coordinates to Zero for a three axis. The user does not use the internal coordinates used by the Shapeoko and Carbide Motion. However the last time you physically set X Y and Z zeros that is remembered by Carbide Motion and is still in effect. Each time the machine homes it may be thousands off from the last homing of the internal coordinates so when running a repeat job after a power cycle it is best to check by using the jog rapid positions to verify the X and Y Zeros as well as Z.
Additionally during configuration you set the machine type and Z type and the internal coordinates set during homing are used to limit the jogging. However if you write gcode that tries to go past the limits of your Shapeoko size the Shapeoko will try to carry out those orders causing the machine to hit the mechanical stops and grind away. There is some cushion on the machine limits in jogging and they can be manually increased during configuration. Do not move these much because you dont want to hit the mechanical limits and lose steps.
Thanks for the replies.
The real issue I was having was setting the “part” zeros. Wanted to do it manually before using a bitzero.
Touched off on X and Y using the paper method with a 1/4” probe. Typed in -0.125 for X and Y and hit set zero. Well it set zero’s -0.125 off the part! Know now to touch off, move over half the probe, then set zero’s.
Just a little different from what I do at work.
Thanks again.
Don’t hit “Set Zero”, that is essentially saying set the current position to zero. Just type in the -0.125 and hit Enter. Then LOOK at the readout to check it. 
And you might want to use -0.129 (Most standard paper is 0.004" thick)
1 Like
Just got some .001 shim stock. I use it to Zero “Z”. I have had the best cuts since using that. I also Zero off the spoil board. “set zero to bottom of stock”
Good Luck
1 Like
This topic was automatically closed after 30 days. New replies are no longer allowed.