Last edited by Frank S; 12-21-2019 at 09:03 AM.
Last edited by Frank S; 12-21-2019 at 12:53 PM.
Do you use a thrust washer to keep the pulley centered between the plates. I know there is near no axial force on the pulley, but are you keeping it centered via the bushing being press fit, and using a shoulder bolt to prevent the plates from squeezing the bushing? I'm asking what your stack up is to keep this from failing. You have worked on lots of stuff, and kept those good packaging ideas.
Any way where is the skinny the plates are cut from 1/4" plate the sheaves or pulleys as you called them are comprised of 3 pieces welded togwether in the grover then ground and lightly turned to achieve the radius to closely match the cable. the bolts are 3/4" gr 5 the sleeve on the bolts is a cylinder with a 3/4" ID and a 1" OD about .030" longer than the sheave is thick the shims on either side are .010" thick 1" bore and 2" OD the pressed in bushing is Delrin 1" ID 1 1/5" OD .005" longer than the thickness of the sheaves I would have used oilite bronze but didn't have any and for what I am going to use them for it doesn't matter all that much anyway.
so as you see the plates are held tight in place on the sleeve around the bolt and this establishes clearances not that clearances are all that critical either as long as the sheave is free to rotate and the cable cannot become wedged between plate and sheave in the event of fouling.
After your reply I looked up the difference of sheaves and pulleys, looks like the pulley is the assembly, and the sheave is the free spinning disk with a groove for a rope, chain, or belt.
Thanks for the build up description.
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