Hi all, I'm struggling trying to get my head around this. The more sites I visit and read the more confused I get. After I home the machine the knee is all the way down away from the quill. For the sake of round numbers assume that it's at zero and if it were to move up to touch the quill the machine Z value would be -12.000" (round number for this example) Now I place a 123Block on the table and insert my T99 Touch Probe which has a length in the tool table of 4" (another round number for this example) using M06 T99 G43 If I move the table up until the touch probe discovers the 123 block (G38 command) the G54.Z location changes to the distance the knee has moved up. So 12" total movement minus 3" 123Block and there's a 4" probe in the quill so the table can only move up -5.000" and that goes into G54.Z so the DRO on the screen now reads 0.000" as that's the now working surface. Now I do an M06 T4 G43. Remove probe and Insert the tool with length 2" in the tool table and click on OK. G54.Z changes. And if I move the knee up until the tool just scratches the 123Block surface the Z value is now zero. How does the system calculate this new G54.Z value? And if I change to a different tool with 5" in the tool table what does G54.Z become so the tip of this new tool also scratch the top of the 123Block and the Z value reads 0.000"? Thanks John
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