We are currently designing some linkages and the question of plain bushing vs needle bearings at the joints has started a small debate. The mechanism in question could be considered a 6 bar linkage, the links are in the range of 4" in length, weights are in the range of a couple of pounds. Most joints will oscillate only about 100degs, back and forth, 100 times a minute. Looking to get about 5 million cycles of life. Lubrication is tricky since this mechanism is in close proximity to a food contact surface.
Can anyone suggest some good resources for designing/ selecting bearings for oscillating joints?
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