I'm refining my last post a bit.

My machine is consistently NOT cutting through the material when it should.

My machine is a 2016 PRS Alpha ATC. I have skimmed the spoilboard. I program the file to cut through the material by 0.15". That doesn't come close. I keep changing it until I'm telling it to cut into the spoilboard by 0.080" before it does. And it's NOT cutting 0.080" into the spoilboard.

On my ancient 2001-2002 PRT machine, it worked like a dream, even if I didn't skim the board for weeks.

What on Earth could be causing this?