Need Proofgrade for accurate alignment results?

[Scott.Burns]

@markwal

Because for the non-palmercr use cases it is more likely to be uniform thickness and flatness.

There have been many reports of warped Proofgrade. People also report getting very flat non-Proofgrade Baltic Birch.

Warp in proofgrade wood products?

Coming from a high humidity area (like they have at Glowforge HQ), and recently having bought some non-Proofgrade birchwood ply that arrived perfectly flat 6 months ago, I can say that… Storing it flat with weight on top of it keeps it from warping. Storing it standing on it’s end causes nice sleigh runners to develop. Leaving a sheet out on the top of the desk for a week or two in an air conditioned environment can cause a couple of mm of warp to form, even in that short a time. I think we’r…

@rpegg

Most of my ply proofgrade and non proofgrade has a slight warp even though always stored flat.