While there are lots of people that will cut into their “spoil boards” and or resurface them, I have never been an advocate of doing this.
I have always considered it the “bed” of my machine, and as such it should be completely flat.
However, because of the inherent problems of movement with MDF, I have replaced my bed with aluminum fixture plate.
I ALWAYS use a piece of hard board under whatever I’m cutting to protect the bed. (I did this even before I replaced it)
My Z zero is always from the top of my work piece.
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