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General Mach Discussion / Z Axis will not plung to correct depth, Mechanical Problem or Program Code?

« on: December 31, 2007, 07:40:35 AM »

I am trying to cut a simple square out of my stock.  My stock is .75" thick.  My G Code sets the Z to plunge and cut to Z-0.75.  The Axis begins to plunge about half way, then appears to do a small bounce upward, then cuts leaving a cut depth of about -0.25.  Once it finishes the square cut it begins to cut air on any other geometry that is after the Z-0.75 cut.

Can anyone help with this?