G90 & G91

[viroy]

Hello,
I am using NCStudio right now for milling and it works good, except for one very annoying problem... after moving the mill to the start point I want, I have to turn off the CNC and hit 'move to origin' in NCstudio to get that point set as XYZ zero.

I have tried using the 'set origin' button, it still shows the true location in the machine coordinates and sets the work coordinates to zero... but when I start cutting, it moves to the machine coordinate zero instead of the work coordinate zero.

How can I fix this so I do not have to keep powering on/off the CNC?
Thanks,
J

[viroy]

Maybe the G90 or G91 command is affecting this?
Not sure what they do, but in the first few lines of all my code there is a g90 command. Normally when I start the program, the mill will go from the start height to 0 on the Z axis and then back to the start height... then it moves to the first cut.
Sometimes I do not want the mill to touch the top of the stock before starting, so I will remove the G90 line... it will then go right to the first cut.