Ive seen UHMW recommended as a router fence material so I looked it up at McMaster, and they have 90 degree pieces, 3.5" on each leg and 1/2" thick.
I was wondering if just using a piece of UHMW would provide enough precision. The tolerances for the UHMW itself are listed on the site (leg length and thickness tolerance are both .06). Its not the cheapest material in the world (8.56/ft) but if it holds up better than MDF, its almost a guaranteed "accurate" 90 degrees and pretty quick to just make a couple slots in to turn it into a sliding fence.
Any opinions?
Thanks!
-Chris