Re: OT: Sprag/clutch bearings need not be aligned?

John Doe wrote in news:qnsnfn$6be$1@dont- email.me:

snipped-for-privacy@gmail.com wrote: > >> Just what are you talking about ? > > I am talking about arranging two Sprag/clutch bearings in parallel > on a shaft so they act as one with (ideally) twice the torque > handling ability. > > It is for a drive wheel with a 35mm bore. A clutch bearing (CSK15PP) > fits into both sides of the hub. >

Since when does a bearing "handle torque"?

Reply to
DecadentLinuxUserNumeroUno
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decadence.org:

when it is a one way bearing

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Reply to
Lasse Langwadt Christensen

Lasse Langwadt Christensen wrote in news:7114ae2b- snipped-for-privacy@googlegroups.com:

Bearings are used to make a sprag clutch, but the bearings themselves are not bearing the torsional forces, the sprags and housing are.

It is essentially a one way optimized ratchet clutch where the ratchet locking elements are called sprags, so they called it a sprag clutch. The "bearings" are there to allow smooth operation in the locking direction and provide centering of the center section.

We should have called them sprag wrenches I guess, instead of ratchets.

Two such clutches in series can handle more torque, but I would not simply double the expectation because the shaft might overpower one before the other, or the one that happens to be slightly weaker than the other will break first. Kind of like parallel diodes.

Reply to
DecadentLinuxUserNumeroUno

.@decadence.org:

Wikipedia has its limitations. This article is one of them. It needs some good illustrations. This is better, about 9 rows down the page there is a diagram rather than photos. Clicking on that shows some other drawings wi th various additional info.

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  Rick C. 

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Reply to
Rick C

John Doe wrote in news:qnstlv$ej9$1 @dont-email.me:

I never acted in any such way, you stupid f*ck.

And in one reply, you, as usual prove that you are a retarded asswipe. And you do not even have to act like it. You LIVE it, asswipe!

You couldn't even get the arrangement description right. They are in series, dipshit. Just because you face two together and the faces are parallel, does not change the fact that they are in series on the shaft they are on. They bear a load in parallel, and there is where I spoke about one not being exactly the same as the other and hence one would always fail at a point before the other, just like parallel diodes do.

You need to gro the f*ck up.

Reply to
DecadentLinuxUserNumeroUno

decadence.org:

using your weird terminology, would that be diodes physically in parallel o r electrically in parallel ?

Reply to
Lasse Langwadt Christensen

Lasse Langwadt Christensen wrote in news: snipped-for-privacy@googlegroups.com:

If you want them to last, BOTH. They need to be very proximal to each other such that their temperature rises together in unison, because not doing so is why they experience failure modes related to thermal runaway because one diode takes over the whole task.

In this mechanical scenario, both clutches are likely rated the same, and would likely test very very close to each other, so a failure mode of one then the other is unlikely. It would happen, but only at the very point where both are about to fail. One would go first.

Reply to
DecadentLinuxUserNumeroUno

des do.

Not the worst analogy but fits. Maybe I am wrong a little about it being li ke electronics. Still similar.

Alright, let's take two diodes in series. If you need more current that wil l do not shit for you. the limitation on current is still the same, the PRV doubles but that is not what you need.

I think we had this about parallel diodes before, I think the consensus was if you need the current just get the bigger rated diode you need. Parallel ing diodes is as bad as transistors. I actually designed a circuit a while back to balance unbalanced transistor s, actually it was for MOSFETS. That is harder ecause with bipolar the tran sistor with less gain automatically gets more drive. Not so with MOSFETS.

Maybe I'll LTSpice it and post it. Couple things not worked out, the system would oscillate between devices, its effect has to have a limit so it has to be determined just how much imbalance do we want it to tolerate. So much GM to so much Gm it can handle but no more.

Anyway, the asker (OP), mechanics is not electronics. I was tops in mechani cs in school. Well not just school, the test had me at the 99th percentile, that means tops more than just that school.

Reply to
jurb6006

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