Unable to have Z negative while also having X and Y negative

[brwoodfisher]

I am currently setting up an older Hendrick CNC router and home (0,0,0) is set to the top right of the table, with the spindle fully retracted. All X and Y coordinates are negative, and Z is also negative.

I have the stock set up so that it is in the home corner. The issue I'm having in Fusion is that I cannot seem to get the Z to be negative when setting the origin with 'Stock box point' to the top right of the stock. Only Y and X are able to be negative and attempting to make Z negative moves the origin completely.

Any suggestions are much appreciated! I'm fairly new to this so I'm still working on understanding how this machine works.

[johnswetz1982]

You can change it from stock model orientation, BUT

You are confusing Machine coordinates (G53 or G28) with your work offset coordinates (G54).

[seth.madore]

When the Z moves down into the material to cut, are you expecting to see Z positive values? What post processor are you using? Does your machine utilize work offsets (G54, 55 etc)?