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« on: February 03, 2014, 04:58:31 PM »
You only need to zero the X and Y once. Most people do this separately from the Z axis.
For the Z axis, my 2010 Screenset includes macros to automatically zero tools during toolchanges. Everyone using it will tell you its hands down the best way to zero tools without an ATC.
It requires two plates, one movable, and one permanently mounted to the machine.
Before you start cutting, you zero the tool to the workpiece with the movable plate, and the macro measures the location of the fixed plate relative to Z zero. It then automatically zeroes subsequent tools to the fixed plate.
The Big Tex screenset also uses two plates, but doesn't zero the tools automatically.