Z value does not equal to zero when the tool touched the surface of workpiece

[manisap]

Hello. I use Paratec PV5 machining center with Mitsubishi Meldas 60 controller. After I set Z value of the surface, tool length, and offset tool and started the operation. The Z value shown in the position page does not equal to zero when the tip of the tool touched the surface of workpiece. What is wrong with G43 and how can I fix it? Thank you.

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[avongil]

I'd love to know the answer to this also. I have just learned to live without my z display. I use the Distance to go to know if my program works.

AG