Uploaded March 2024 | Updated September 2026, 1 week ago
Easy to just show with this 1" travel indicator. Test indicator is more accurate, but you get the idea! Not a standard way to test. Just showing how crappy those cheap pulleys are!
I did a proper test with a test indicator. The gates was .0015". That Chinese pulley was .0085". It was one of the better ones I had.. tossed a few in the bin and drilled some out for other projects. Shafts were tested for run-out prior to test and were .0005" out. I had them spinning on bearings because I didn't want to make a few small V-blocks to do a proper test. Honestly, I don't care about .001" run-out.
Shafts were the bearing shafts from KB3D. Slightly larger than typical HSS 5mm shafts I buy. Much tighter! Even the pulleys are tight on the bore with loose set screws.
Easy to just show with this 1" travel indicator. Test indicator is more accurate, but you get the idea! Not a standard way to test. Just showing how crappy those cheap pulleys are!
I did a proper test with a test indicator. The gates was .0015". That Chinese pulley was .0085". It was one of the better ones I had.. tossed a few in the bin and drilled some out for other projects. Shafts were tested for run-out prior to test and were .0005" out. I had them spinning on bearings because I didn't want to make a few small V-blocks to do a proper test. Honestly, I don't care about .001" run-out.
Shafts were the bearing shafts from KB3D. Slightly larger than typical HSS 5mm shafts I buy. Much tighter! Even the pulleys are tight on the bore with loose set screws.
