GTA
All Springer/NP/PCP Air Gun Discussion General => "Bob and Lloyds Workshop" => Topic started by: Duane38 on June 29, 2021, 06:00:16 PM
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Looking for a needle bearing [source] that will be used in a pump arm pivot. So, loads will be dynamic with upwards to a 2500lb max load. If one should even exist in my size requirement:
.5" O.D. x 5/16" thick/tall x .25" shaft size/inner hole size.
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Needle bearings (flat) typically have a precision washer on each side. I would check McMaster Carr.
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Where all have you looked, so that you don't get suggestions that you have already tried?
Jesse
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McMaster Carr, closest size is nowhere near that load rating....
https://www.mcmaster.com/5905K21/ (https://www.mcmaster.com/5905K21/)
1/4" shaft, 7/16" OD x 5/16" wide.... but only 570 lbs. dynamic load and 470 lbs. static.... ::)
Bob
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https://www.qbcbearings.com/BuyRFQ/NeedleB_ST_OE_I.php (https://www.qbcbearings.com/BuyRFQ/NeedleB_ST_OE_I.php)
These aren’t rated for enough either.
Dave
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check BOCA BEARING as well ....
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I've just looked at Motion Industries; even when you step the pin diameter up to 5/16" (which appears to be the only way to get a 1/2" OD) the load rating is still only 920 lbs dynamic and 1030 lbs static....
https://www.motionindustries.com/products/sku/00090420 (https://www.motionindustries.com/products/sku/00090420)
Another one-.25" bore, .3125" wide; but only 7/16" OD... Only 800 pounds dynamic load-https://www.mscdirect.com/product/details/19390616 (https://www.mscdirect.com/product/details/19390616)
I really doubt you will be able to find anything in that narrow of a bearing that will even come close to a 2500# load rating....
Jesse
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Welp. Didn't think it existed.
Right now, which will be just fine, there is a pressed in drill bushing. The friction between the two is probably not going to be noticed on the long lever.
Thanks all.
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You could always try one that fits with your current setup-might last longer than expected even with the (much higher than rated) load... If it doesn't work; press the drill bushing back in...
Jesse
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I wouldn't use a drill bushing, they are not designed for side load. Try a bronze self-lubricating bearing.
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Looks like the ID and length have to be quite a bit larger to approach 2500 lb load rating:
https://www.mcmaster.com/5905K502/ (https://www.mcmaster.com/5905K502/)
(https://www.mcmaster.com/mvD/library/20210325/5905K502_NEEDLE-ROLLER%20BEARINGL.GIF)
More: https://www.mcmaster.com/needle-roller-bearings/ (https://www.mcmaster.com/needle-roller-bearings/)
EDIT: A drill bushing is a low cost solution where low friction and a slop-less hinge is not required.