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« on: March 06, 2009, 03:07:52 PM »
OK so your zero in machine coords is when it is fully down? Do you programme all your z moves as positive numbers? If you do then your G28 should be a positive number. If you dont then you need to go to Homing and limits and tell Mach that your Home Off distance is the amount of travel you have on the Z axis. That would mean that when you home instead of the Z axis machine coords DRO reading zero it will read minus X where X is the travel you have. Then the G28 would be a negative number but it would be less than the Home Off distance. Example if you have 1 inch of travel you would have the Home Off set for -1, so if you wanted the Z to move up 0.25 from the Home position you would enter -0.75 as a G28 position.
Hope thats clear LOL
Hood