Coupling shafts of different diameter?

[des53]

Hi, I'm modifying an old linishing machine to fit a sanding bobbin on one of the drum shafts, basically I want to extend a 5/8" diameter shaft and couple it to a 1/2" diameter shaft, in line without using gears, although that would be nice later on, which hold the sanding bobbin. I've seen some on the net but nothing simple to link the two shafts, anybody got knowledge of a product?

I don't have access to machining or welding etc. so it need to be straight forward bolt on fit.

Many thanks.

 

[samss]

Would a lovejoy coupling work? http://www.lovejoy-inc.com/

 

[des53]

Thanks for the link. I'm not sure if it will work or not, looks expensive but I'll contact them and see what they have. Thanks....

 

[bob15]

Try McMaster Carr: https://www.mcmaster.com/#lovejoy-couplings/=154eqhi

or

https://www.mcmaster.com/#standard-shaft-couplings/=154eqrc

 

[raddksn]

another vote for lovejoy!

 

[bsaint]

Im guessing like 1/2 hp?

 

[Gotcha640]

5/8 ID sleeve, 1/2 ID x 5/8 OD sleeve, drill and tap for set screw, or if you really have no machining capability at all, hot glue or jb weld.

 

[lilredex]

Assuming it does not need to be self supporting.......I'd use a length of HD heater hose with a split bushing (5/8 X 1/2") and hose clamps.

A picture would help.

 

[Advan]

Agreed, a picture would help immensely, but it sounds like you just need a 1/2" x 5/8" rigid sleeve coupling.

https://www.amazon.com/dp/B003XHEUGC/?tag=atomicindus08-20


Climax #ISCC-062-050
https://www.climaxmetal.com/Catalog_Downloads/climax/climax-catalog.pdf

 

[des53]

Yes its a 1/2 hp electric motor with a Picador linisher. The linisher has a drum on each end I'm going to add a further spindle to one shaft. Its not fast but it does what I need in terms of stock removal just fine.

 

[bsaint]

I wouldnt use bushings imo. You can find a shaft coupling with different sized ends pretty easily.

Too bad you can use an Omega coupling. Those are my favorite. But 1-1/2" shaft is the smallest they go which is like a 15 hp motor lol

 

[6PTsocket]

I had to go to Wikipedia to find out what a linisher was. Apparantly the definition is so broad, using belts or stones, that it could be almost anything. It may be a common term in some industry but it was a new one on me. We used a rubber hose coupling and spring clamps or ty wraps to run a tach, that monitored machine speed but I would never consider it to transfer any power.Besides you might have a problem finding a hose size that is a good fit on two differnt size shafts. Go with one of the other suggestions. Shim up the smaller shaft with a steel bushing or use a coupling adapter

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[Steve from Socal]

I have used hose and worm clamps on a procon pump driven by a 2HP motor to pump thousands of gallons of diesel through a fuel polisher with no problem. I agree that a commercial coupler would be best but, reinforced hose will work in a pinch.

Steve

 

[cvairwerks]

Unless you know your shafts are parallel and concentric, go with an Oldham coupling.
https://www.mcmaster.com/#standard-shaft-couplings/=154ih2t

Pick your shaft sizes and order it for about 30$.

 

[Dingleburry]

Love joy or TB woods sureflex.
Heres a selection tool.
here.

coupling

 

[des53]

Thanks everybody for the replies very helpful. As you requested a picture I've attached one.

The coupler for the sanding bobbin is to go on the end drum shaft, opposite end to the pulley drive. For those who wonder what a linisher is this one is made by Picador and long out of business in the UK, mainly for metal but frequently used by many on wood and ideal for the small workshop and easily rigged to a motor. Although an old piece of kit its open to modifications and reasonably accurate but limited on size of stock.

Thanks.

 

[6PTsocket]

I have used hose and worm clamps on a procon pump driven by a 2HP motor to pump thousands of gallons of diesel through a fuel polisher with no problem. I agree that a commercial coupler would be best but, reinforced hose will work in a pinch.

Steve

Good to know. I'll have to rethink that. Thanks for the info.

I wouldnt use bushings imo. You can find a shaft coupling with different sized ends pretty easily.

Too bad you can use an Omega coupling. Those are my favorite. But 1-1/2" shaft is the smallest they go which is like a 15 hp motor lol

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[lilredex]

Just use the coupling Advan suggests...

https://www.amazon.com/dp/B003XHEUGC/?tag=atomicindus08-20

 

[Alchymist]

https://www.amazon.com/dp/B003XHEUGC/?tag=atomicindus08-20

 

[Alchymist]

Or if shaft misalignment is a concern, grab one of these, throw it in a drill press and drill each end to match the shaft.

https://www.amazon.com/dp/B01IBCI61I/?tag=atomicindus08-20

 

[theoldwizard1]

Agreed, a picture would help immensely, but it sounds like you just need a 1/2" x 5/8" rigid sleeve coupling.

https://www.amazon.com/dp/B003XHEUGC/?tag=atomicindus08-20

YES ! Keeping the 2 shaft concentric is MANDATORY or it will shake it self to death.

 

[des53]

Just an update for those interested. Thanks for the links supplied and suggestions. Based in the UK finding one of these couplers was to say the least difficult, it would be cheaper and easier to import from the states, you guys are lucky to have such an availability of fixtures, fittings, tools and equipment. Coupler price was going to be £100 and 9 weeks delivery!! Ended up putting 5/8" steel tube over shaft and then pushing a 1/2" steel tube inside the 5/8" tube, the 1/2" bobbin shaft fits perfectly inside the tube. It has no free movement due to the seam inside of the tubes but I think I may epoxy the tubes and lock shaft with grub screws. Seems to work fine at 1400 RPM with little or no misalignment.

 

[6PTsocket]

Just an update for those interested. Thanks for the links supplied and suggestions. Based in the UK finding one of these couplers was to say the least difficult, it would be cheaper and easier to import from the states, you guys are lucky to have such an availability of fixtures, fittings, tools and equipment. Coupler price was going to be £100 and 9 weeks delivery!! Ended up putting 5/8" steel tube over shaft and then pushing a 1/2" steel tube inside the 5/8" tube, the 1/2" bobbin shaft fits perfectly inside the tube. It has no free movement due to the seam inside of the tubes but I think I may epoxy the tubes and lock shaft with grub screws. Seems to work fine at 1400 RPM with little or no misalignment.

That's funny. I always see neat stuff on UK web sites. The grass us always greener.......

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