[kolias]

Thanks for the help, I know about tramming and its not what I'm after.

The cnc is brand new and haven't done any real cut yet. Since the tabletop is so large (34"x46") I was thinking how to verify if the depth of cut is equal at any place of the tabletop. I did a cut of a rectangle 1/8" deep and measuring the depth with a micrometer it shows 1/8" all along the groove. So its good.

However I was thinking since I have a probe which establishes the 0" point of the surface before I start a cut if it was possible to use the probe. Perhaps with a script which registers the point at one end and then compares that value with a new value at another point of the table?

[Superman]

Thanks for the help, I know about tramming and its not what I'm after.

The method of tramming is to set spindle perpendicular to the table....after you check the gauging positions ARE at the same zero level. So you don't tramm your spindle to a slope.

Another consequence from doing it, is to qualify the table surface is flat, that if you faced the table, it would be also be flat....