What are these

[123hotchef]

Just purchased a few bits wondered what these are.

 

[8ob]

Flexidrive couplings

Bob

 

[123hotchef]

Flexidrive couplings

Bob

the red cast ones too?

 

[8ob]

the red cast ones too?

No, I will pass on those

Bob

 

[123hotchef]

No, I will pass on those

Bob

lol what would one use the coupling for? 2 different size shafts?

 

[Pigeon_Droppings2]

red ones look like the ends of bench press weight bars?

 

[eLuSiVeMiTe]

lol what would one use the coupling for? 2 different size shafts?

Also known as Oldham couplings.
Helps negate small alignment errors when joining a motor to a shaft.
Used on connecting my stepper to the rotary table.

 

[8ob]

lol what would one use the coupling for? 2 different size shafts?

Misalignment really, they dont have much scope or torque capacity. The ones on our PTO chipper are about 6" in diameter and dont last three months.

 

[cheb]

The couplings allow for a very small amount of misalignment and soften the shock of power changes, like putting it in gear for example. Think cush drives on motorcycle rear wheels for the latter, or the small springs in dry clutch plates.

 

[roofman]

They can become noisy beggers when worn too,all the clacking together.

 

[owas]

I've seen people use them on electric vehicle conversions, usually followed by a picture of a broken one

 

[pressbrake1]

Last a long time if mis allignment is in the few thou range but not when trying to use as a uj substitute!

 

[wyn]

lol what would one use the coupling for? 2 different size shafts?

Sometimes the holes are just pilot holes and you get them machined out to the size you need.

 

[Hood]

Also known as Oldham couplings.....

Oldham couplings are actually different animals to these jaw/spidaflex type couplings.
An Oldham coupling has a hard intermediate piece, usually Delrin/Acetal nowadays although I think possibly a hard wood originally. They have a slot on either side which are at 90 degrees to one another and they can allow both lateral and axial misalignment (within reason). They are indeed useful for the likes of stepper motors as they also have minimal backlash.

Pic below of an oldham coupling components, two hubs and the insert..

Animation of one working is here.

 

[eLuSiVeMiTe]

Oldham couplings are actually different animals to these jaw/spidaflex type couplings.
An Oldham coupling has a hard intermediate piece, usually Delrin/Acetal nowadays although I think possibly a hard wood originally. They have a slot on either side which are at 90 degrees to one another and they can allow both lateral and axial misalignment (within reason). They are indeed useful for the likes of stepper motors as they also have minimal backlash.

Pic below of an oldham coupling components, two hubs and the insert..
View attachment 197358

Animation of one working is here.

Should have looked at picture No3.

 

[DAPPH]

The green ones look like they might have come off an engine or motor driven vane type impellor water pump or a big driven cylinder lawn mower with either an engine or battery & motor for power

Look at
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2. Jaw Couplings | RS Components
   https://uk.rs-online.com/.../power-transmission-couplings/jaw-couplings
   Jaw couplings are used within electrical motor and internal combustion systems to transmit power (torque). They are designed to connect two shafts, enabling smooth torque transmission and reducing loss of power. Jaw couplings generally consist of two hubs and an elastomer element, commonly referred to as a cushion or spider. Both the hubs and …

 

[DAPPH]

The red ones look like tube stops on tubular sash cramps or as already stated barbell weight stops off an old set of weights . How big are the hole diameters ?


The bottom picture looks like two home made door stops the steel one would have had a big thick O ring in the groove . The alu one has the black material to touch the door first and not mark the door...... if it stands proud of the alu .

 

[pjk]

Oldham couplings are actually different animals to these jaw/spidaflex type couplings.
An Oldham coupling has a hard intermediate piece, usually Delrin/Acetal nowadays although I think possibly a hard wood originally. They have a slot on either side which are at 90 degrees to one another and they can allow both lateral and axial misalignment (within reason). They are indeed useful for the likes of stepper motors as they also have minimal backlash.

Pic below of an oldham coupling components, two hubs and the insert..
View attachment 197358

Animation of one working is here.

Thanks for the illustration! Very interesting!

 

[bricol]

Just purchased a few bits wondered what these are.

You aren't going to believe this . . . the green thingie is a "Fenner jaw coupling" . . . Otherwise known as a "lovejoy" or Essex" coupling.

https://www.fptgroup.com/Jaw-Couplings/

Use them, or similar, a lot in various drive mechanisms - very reliable, low maintenance if you respect their specifications.

 

[8ob]

Used a similar small coupling on a home grown genny but it used to spew the rubber out of the side when it got hot, the one I used was no name from BSL and came undrilled or bored .

One still left festering in the container. Seem to remeber they can only handle about 10% misalignment