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Topics - banjo_art

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I'm very new to CNC milling and have a very basic question. My Bobcad program generates my Gcode from a Z origin point which is set at the top of the piece I'm cutting. Moving the endmill down into the work is a negative direction in the G code and moving the cutter up is a positive G code direction.

I'm running a Taig mill and operating it with the setup file which came from the vendor.

If I position the face of the endmill on the top surface of the work, and zero the z axis in the Mach 3 software, a negative Z value in the G code moves the tool up not down.  Also a positive G code value moves the end mill down into the work. This is just the opposite direction that I want. I could go into the G code and change the sign of the Z moves but there must be a better way.

Can someone explain the best way to correct this problem?

Any help would be appreciated.

--Art

Phoenix, AZ

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