I want to do a spring perch roller conversion. I've searched several distributors and finally found one that can supply a needle bearing with an inner hardened race that will fit into the stock perches' existing tube and use the existing shaft -- 1 3/8" O.D. for the bearing, 7/8" I.D. on the inner race (I think those are the correct dimensions of the perch, can anyone confirm that for me? Thanks!) The bearings would be press fit onto the shaft and into the tube.
The bearings are 1" wide with an 11,100 pound static, and 5,800 pound dynamic load rating. They also make .75" and .5" bearings with somewhat lower ratings.
These cost a fair bit more than the ball bearings (the inner races are what get pricey) but they would spread the load over a vastly larger bearing surface - almost a full inch on at least two rollers per each bearing (2 bearings per perch, so at least four rollers). Also of course there would be no need to cut the perch and weld in a new pipe.
One downside is that needle bearings (at least these) are not sealed, they would need to be greased on an ongoing basis.
Just wondering what you guy's (and gal's) opinions are of using a needle bearing instead of a ball bearing?
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