I'm surprised there hasn't been any action on this thread since the game was announced and we got the details on the drive parts in the KoP. Maybe it's in another thread that I've missed, but I've searched and haven't seen it.
The KoP contains two 39-tooth aluminum pulleys, 5mm pitch, 30mm wide. The belts are 15mm wide, so the idea (I presume) is to run two belts side by side on each pulley, going to 15mm width pulleys on separate wheels. Not sure I would have designed it that way, because I don't like the belts rubbing where they cross, but I guess it will work.
The part number given in the Drive Base checklist is P39-5M-30 AL. Searching for "pulley" on AndyMark yields the
am-2265, which gives more details such as Gates part number 39-5M25SP01. I can't find either part number, or anything like them, on Gates (or McMaster, or anything else). I've found pulleys (or "sprockets") for 5mm HTD belts, but only in 15mm widths.
We're considering using a different size pulley on the gearbox driveshaft, to change the torque/speed characteristics. For now, we'll try to stay close to the original design of two belts coming off the drive pulley, but we may need to change that. AndyMark doesn't sell any other size, and I can't find it anywhere else.
We don't have the ability to make these parts from scratch. We could combine two smaller pulleys, machining off the flanges where needed (but maybe best to leave at least one flange). How to mount these would be a design consideration, but I think we can figure that out.
Any help on finding sources for these parts would be greatly appreciated. Links are especially helpful.