If you enter a negative 0.75” as a material thickness after spoilboard touch, and your material is thinner than that amount, your pocket depths would be shy by the difference between 0.75” and the actual thickness of material. Same for rasters - you’ll end up with “flat spots” and any material allowance between Roughing and finishing will be incorrect (areas near the surface of the material)
I’m also puzzled why your machine is not lifting to a safe Z Height before moving to your XY zero position after spoilboard touchdown? (if you don’t enter the negative Z)
Mikehell wrote:If I'm simply cutting parts out, I zero to the bed. Anything with pockets gets zeroed to the work surface.
Adrian wrote:Unless, of course, someone is following their chosen method because they completely misunderstand the process.
A few years back on Facebook I had a long and painful debate with someone who insisted you could only zero from the spoilboard/table surface if you never cut pockets or dadoes. This was because, according to him, the maths required to work out the pocket depth in the Vectric software was bound to lead to errors so it wasn't worth the risk.
I explained until I was blue in the face that it didn't make a blind bit of difference to the pocket toolpaths where the z-zero was and the figures are identical for both scenarios but this guy and ,worryingly, quite a few others kept coming up with more and more convoluted formulas to calculate pocket depths when not zeroing from the top of the material.
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