I want to make a sled with t tracks in it for rips on my table saw. Ideally 1/2" thick if material permits. Max 3/4".
I want it to never warp or twist. I also want the edge to be durable since it will be sliding along my fence. I live in an area where humidity varies greatly daily.
The only choices I've considered so far are plywood, MDF, and delrin.
I see my plywood warp regularly. My MDF also temporarily warps on humid days, where one side dries back out faster, plus the edges of mdf seem to fray a bit with wear. Delrin is really expensive, $80 USD for a 2' x 1' x 1/2" sheet.
What should I use? What cost effective and easily machinable material can I use for a warp-free, durable sled base?