Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
(OP)
I am trying to determine the cause of a wear issue on our machine. We have a 440c idler bar that rests in a slotted block made of delrin or UHMW conductive Polyethylene holder. The shaft rotates at ~1500 rpm. I am getting wear on the shaft that produces brown dust. The shaft is 8mm and the holder slot width is 8.3mm. The shaft is meant to be removeable to remove paper jams. Any ideas? Images attached.







RE: Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
RE: Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
RE: Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
You need less friction for that rotation speed, the plastic will wear and then the debris will cause the shaft to wear.
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P.E. Metallurgy, Plymouth Tube
RE: Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
Pin could be as simple as a flat metal plate with a dimple pressed into it, makes contact with the metal screws to ground to the machine body, rely on the plate flexibility for the spring action. Leave a knockout behind the bushing so the plate has room to move a bit.
RE: Wearing of case hardened shaft wearing in delrin and/or UHMW polyethylene holder
PV data chart