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Polymer steady rest bearing in appliance

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plasgears

Mechanical
Dec 11, 2002
1,075
US
About a year ago we bought a nice food processor, which features a steady rest pintle on the power shaft. The cover has a mating plastic bearing. They appear to be the same polymer.

It worked fine until yesterday, when the machine welded up. I had trouble breaking the assy apart. I finally coaxed it apart, and the pintle was found to be heat damaged. I restored it to working order, and, by giving it a shot of non stick spray on every setup, I got it to perform as usual.

What happened? I think the two plastics were identical, like acetal-acetal or nylon-nylon. I will suggest to the mfr to use acetal-nylon as suggested by DuPont. Any other suggestions?
 
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Acetal nylon is a great combination, and hard to beat in such applications. My only reservation might be the temperature resistance of acetal. If you need higher temperatures, try nylon polyester

Regards
pat pprimmer@acay.com.au
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