UMS Gear Pump Belt Drive Conversion

[Vanisle]

Originally Posted by RCP57

Looks good! Where did you get the pulleys and belt from?

Thanks Reg

I don't remember for sure but I think i got them from McMaster. The belts are 70t MXL 1/4 wide. I have bunch of smaller pulleys in 1/8 and 1/4 size and different lengths of belts but this seemed to be a good starting point. One issue is the size of the motor shaft, the larger 42-50 motors have a 3/16 shaft so the 1/8 bore in the 14t is too small, you need to go up to a 16t to get a 3/16 bore. THe 35-48 motor had a 4mm bore so it was easy to bore out the 14t shaft on my lathe. Fortunately, the larger 42t pulley has a 1/4 bore so it just fits a 1/4 stainless rod.

If I recall, the smaller pulleys are about $9 each and the larger ones are about $12. The belts are only a couple of dollars.

I have a bunch of gears from SDP or maybe it was QTC gears (same owners I think) to try out to make my own gear pump. Maybe sometime over the holidays I will get a chance to build my own gear pump. I already made a second bracket (it doesn't take long with a roughing endmill).