Trespa is the trade name. In the Netherlands it is commonly used in house building, to finish the sides of the roof and as panels below windows and so on. It doesn't need to be painted and will last forever, even in our climate. I've heard that it consists of layers of paper, drenched in resin, pressed together under high force at high temp. It looks a little like the old brown PCB boards, but I think Trespa is more dense and heavyer. Great stuff.
The pulleys are for 1/5" pitch toothed belts (5.08mm pitch), 9.5mm wide. There is 40T on the pulley which is 64.6mm (~2.5") dia. The stepper has a 10T pulley giving 1:4 reduction for the pinion drive.
John |