Designing a better Power Coupler...?

[jm51]

Interesting thread!
Here is article about installing a jack shaft:
http://books.google.ca/books?id=9tsDAAA ... th&f=false

That issue has an article 'Rockets for Civilians'.

[robinson46176]

I am a little confused about this coupling method.

I think that I understand the individual hubs]this search[/URL] but this may be more than I wanted to get into.

In my case the only reason to not just use the standard Shopsmith coupler is so I can quickly and safely disconnect the band saw mounted semi permanently on a mini without moving the headstock at all. Otherwise I have never had any problem at all with the factory coupler.
My thinking is that I can use a Lovejoy coupler on this application leaving the drive end mounted permanently on the headstock stub. The other half would be mounted on the bandsaw drive shaft which has a longish flat for the setscrew. If I was not using the bandsaw but wanted to run something on the quill I could quickly loosen the setscrew on the bandsaw shaft end and slide that half along with the spider to the left about 1 1/4" and snug the setscrew so it would not vibrate out of place and use the quill attached item with the bandsaw idle. Re-engagement would be equally as fast and easy.
There is a possibility (I have not checked yet) that the space between the headstock and bandsaw will be longer than the stub and bandsaw shaft are and if so I can just extend the bandsaw shaft as needed. I would likely make an extension like these motor shaft adapters below but with Allen setscrews and an un-threaded shaft with a long flat.
[ATTACH]16637[/ATTACH]


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[tenbears]

here is the Lovejoy website link http://www.lovejoy-inc.com/products/jaw ... -type.aspx, Thanks for the style info Bill, "either the L075 or L090 works". The 5/8 bore no keyway part numbers are 44322 and 46052. You can mix and match bore sizes within the same style of coupling. These are tough hombres as I have used them when attaching hydraulic pumps to drive motors both electric and fuel driven. You might want to have a few of the hard rubber inserts as they do wear resulting in a sloppy joint. Never thought of using them on a shopsmith. Another great tip from Bill.

[garys]

I am still using my original power coupler that came with the Mark V in 1989. Don't know how much better one can be made than the OEM.

I've broken a few couplers over the years, but I still feel that you can't beat the OEM design. I would be concerned about using any coupler that doesn't have the Shopsmith spring inside the driving cup. That spring is an engineered safety device to prevent any parts from a broken coupler from being flung out at the operator. Without that spring, the half of a broken coupler that remains on the driving gear will become a missle once it finally releases from the gear from centrifugal force.

[paulmcohen]

I have been trying to follow this and other threads on Lovejoy coupling for some time now. I have read all the links and I still feel lost. Can someone list exactly what parts I need to purchase to connect a Shopsmith PowerPro to a Bandsaw, Jointer, Strip Sander and other SPT tools. I don't have the expertise to select the correct parts, please no options, a supplier would be worth bonus points.

[jcraigie]

Dusty:
Sintered Iron Hubs (L035) or Cast Iron Hubs (L190)
Elastomeric Spider (SOX, Urethane, Hytrel®, or Bronze)

SOX (NBR) Rubber (Standard Insert) - Nitrile Butadiene (Buna N) Rubber is a flexible elastomer material that is oil resistant, resembles natural rubber in resilience and elasticity.

Urethane - Greater torque capability than NBR (1.5 times), provides less dampening effect, and operates in a smaller temperature range. Good resistance to oil and chemicals. Not recommended for cyclic or start/stop applications.

Hytrel® - Flexible elastomer designed for high torque and high temperature operations. Excellent resistance to oil and chemicals. Not recommended for cyclic or start/stop applications.

Bronze - Rigid, porous oil-impregnated metal insert exclusively for low speed (max 250 RPM) applications requiring high torque capabilities. Not affected by extreme temperatures, water, oil, or dirt.

[jcraigie]

Paul:

For your 1/2" shafts:

http://www.grainger.com/Grainger/LOVEJO ... Pid=search

For your 5/8" shafts:

http://www.grainger.com/Grainger/LOVEJO ... Pid=search

Spiders to go in between the couplings (get several the gremlins like to run away with them )

http://www.grainger.com/Grainger/LOVEJO ... Pid=search

[paulmcohen]

Paul:

For your 1/2" shafts:

http://www.grainger.com/Grainger/LOVEJOY-Sintered-Iron-Shaft-Coupler-Body-4X176?Pid=search

For your 5/8" shafts:

http://www.grainger.com/Grainger/LOVEJOY-Sintered-Iron-Shaft-Coupler-Body-4X179?Pid=search

Spiders to go in between the couplings (get several the gremlins like to run away with them ]http://www.grainger.com/Grainger/LOVEJO ... Pid=search[/URL]

My 220V PowerPro is rated at 2HP but the spider seems rated much less. This is the kind of stuff that has confused me in the past.

Of course I have no idea how much HP is actually needed or applied to the various SPT's.

HP Rating @ 300 RPM0.2
HP Rating @ 1200 RPM0.8
HP Rating @ 1800 RPM1.2
HP Rating @ 3600 RPM2.5

[dusty]

My 220V PowerPro is rated at 2HP but the spider seems rated much less. This is the kind of stuff that has confused me in the past.

Of course I have no idea how much HP is actually needed or applied to the various SPT's.

HP Rating @ 300 RPM0.2
HP Rating @ 1200 RPM0.8
HP Rating @ 1800 RPM1.2
HP Rating @ 3600 RPM2.5

Just buy the biggest, baddest spider you can get to go with the lovejoy you have and don't worry about it.

Even with your 220 Volt 2.0 HP PowerPro Headstock you are going to get just so much HP and that is all.

OR use rhe Shopsmith Power Coupler. No reason to be confused.

[robinson46176]

OR use the Shopsmith Power Coupler.

That is exactly what I intend to do with everything except the one bandsaw / mini setup. Other than a special need like that why even bother to look for anything else. I'll continue to use the standard coupler for everything else. There is nothing wrong with it... I think I have 6 of them (came with other units) and I seriously doubt that I ever have to buy a new one.


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