[Donut]

We are looking at using an elevator/telescoping arm for climbing the pyramid this year. Right now the design requires a 2 stage elevator which makes me lean towards using cable and pulleys to drive the arm since we could use a single motor/gearbox to drive both stages. I found some good information in old threads on cable types to use and how it needs to be routed but I didn't find a whole lot on what teams actually used for pulleys and anchors.

So I'll pose the question to teams who've done elevators before, where do you get pulleys from and what do you actually tie your cable to as an anchor? I found some pulleys on McMaster but I'd like to use small diameters (~1") to make it fit better in the mechanism. The few pulleys with bearings around that size were only rated for 175 pounds which doesn't give much of a safety factor if our robot is near full weight. The pulleys without the low friction bearings could support much higher weights but I'm not sure if the bearings would be needed.