INCONSISTENT V Groove Depths

[sevans]

Okay, Long story short (I hope). I was cutting an inset border about 1/4" wide in HDU sign foam. I did this cut with a 120 degree HerSaf Insert Cutter. A little over halfway down the table, it barely even cut the border. This, of course indicated a low spot. This was right after planing the table. I am using a vacuum hold down system and you can't force the material off of the vacuum. If it were the Z axis, it should be doing this in other places. Any suggestions?

[paul_z]

Sarah,

Are you certain the HDU is of uniform thickness? Perhaps plane it first??? Then even if something is warped, the planing and v carving will be "conformal".

Paul Z

[sevans]

Thanks much for your response. I guess that somewhere inside I was hoping I wouldn't have to plain every sheet. However, it may be important to note that I stored the HDU for several weeks up on it's side. It bowed up on me a little. Perhaps this is the answer. If I stored it flat, would I have to surface the board first? Again, thanks so much!