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Author Topic: Uj joints for brushless motors  (Read 3499 times)

Geoff

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Re: Uj joints for brushless motors
« Reply #50 on: October 10, 2023, 11:59:50 am »

I take your point re axial loads with brushless motors when used in model planes, good point. Are the same motors used in boats, I just don't know but a valid point indeed. However the couplings may not take these axial loads which is the main point.


Cheers


Geoff
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Subculture

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Re: Uj joints for brushless motors
« Reply #51 on: October 10, 2023, 02:34:36 pm »

That would depend on the coupling. A solid coupling will clearly transmit the load. A cardan style coupling would also transfer axial force. A dog and bone coupling would not transmit an axial load, as the two parts are not connected axially.
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ooyah/2

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Re: Uj joints for brushless motors
« Reply #52 on: October 21, 2023, 01:09:25 pm »

Hi GUY'S,
A bit late on this subject but here is how I make DOG & BONE couplings.


Get a flat used file about 1" wide by 3/16" thk stick about 12" into a coal fire and leave it there until cool in the morning.
Cut off about 5" of the file with hack saw
Drill and form a a hole as shown in pic to suit the size of the ball, hole to be . 015'" dia smaller than the finished ball to allow filing to final dia, make sure that the cut is 7deg to allow swarf clearance.
When completed re harden the tool for cutting the ball.


The driver to the engine is a simple turning job and the final ball has a 1/16" dia rod drilled thro'.


When finished case harden the mild steel components.


All done quite easily


George.
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Circlip

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Re: Uj joints for brushless motors
« Reply #53 on: October 21, 2023, 01:21:18 pm »

An oldie but goody  ;)  Miles better than the plastic monstrosities


 Regards   Ian.
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John W E

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Re: Uj joints for brushless motors
« Reply #54 on: October 21, 2023, 01:34:20 pm »

George, definitely one of the best solutions - the only problem I can see now is - do people know what a coal fire is these days.  There probably wont be many around now - by God I would give an arm and a leg to have a coal fire in this house that I live in now - the modern thing with no chimney.


Well, rant over.


John
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ooyah/2

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Re: Uj joints for brushless motors
« Reply #55 on: October 21, 2023, 03:17:25 pm »

WHAT ,
No Chimly what about Santa


Geo
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philk

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Re: Uj joints for brushless motors
« Reply #56 on: October 21, 2023, 03:20:59 pm »

WHAT ,
No Chimly what about Santa


Geo
haven't you heard santa's not woke enough
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Martin (Admin)

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Re: Uj joints for brushless motors
« Reply #57 on: October 26, 2023, 03:04:27 pm »


   This is what we need! ...



 
 
 
 
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ooyah/2

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Re: Uj joints for brushless motors
« Reply #58 on: October 27, 2023, 11:41:12 am »

Wow,  That's what I call a coupling.

George

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