OT Reducing friction between bronze bushing and shaft? - Page 2
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  1. #21
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    It’s not the material costs but the extra associated extra costs hardening and the difficulty of the small threads required. At this point I am only making one. McMaster has 440c day in 55RC and 20RC conditions. But the difficulties in making the part don’t excuse the improved suitability
    Last edited by Hazzert; 09-22-2018 at 08:38 PM. Reason: Keyboard stroke

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    Quote Originally Posted by TDegenhart View Post
    For something to spin that long, I suspect either an air bearing or magnetic bearing.

    Tom
    Yup, cheap Chinese rare earth magnets, some epoxy, bada bing.

    Keeps it centered too.

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    This is a bearing reel, but it spins for almost 11 minutes.

    https://m.youtube.com/watch?v=waPmA3LUoLE

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    Interesting point the first commenter has - if "startup" (the reel acceleration from still to full-speed) is important, then you want to lower the moment of inertia of the reel, which means as thin a section as possible to the outside. That's in some ways counter to a long spin time, as the "flywheel" effect is lessened, but it will allow line to pay out faster.

    FWIW, I'm not a fisherman, and haven't even tried a rod and reel since I was a kid. So there may be factors that matter that I'm unaware of.

  5. #25
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    Quote Originally Posted by Milland View Post
    Interesting point the first commenter has - if "startup" (the reel acceleration from still to full-speed) is important, then you want to lower the moment of inertia of the reel, which means as thin a section as possible to the outside. That's in some ways counter to a long spin time, as the "flywheel" effect is lessened, but it will allow line to pay out faster.

    FWIW, I'm not a fisherman, and haven't even tried a rod and reel since I was a kid. So there may be factors that matter that I'm unaware of.
    You’ve basically hit the nail on the head Milland. Some fishermen prefer the faster start up of a bearing vs the quiet or “silkyness” of a bushing. The typical west coast style of casting these reels is to drop the lure a foot or so on the backswing to set the spool spinning and load the rod then follow through forward with the reel freespooling, only stopping the spin right before impact to prevent over run.

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    Perhaps there is a reason why they are called "anti-friction bearings"

    A harder (stronger) shaft may also allow you to reduce diameter, which will reduce drag torque.


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