Any reason not to use Lovejoy couplings?

skou · Post by **skou** » Thu Jul 25, 2013 2:11 am

JPG40504 wrote:I do not unnerstan couplers breaking. I still use my half century old one.

I do make shafts align as good as I can.

JPG, they act as a "shear pin" which is designed to fail before something else does. (Kinda like a mechanical "fuse.")

You're just doing it right. (but, since they are plastic, they will fail sometimes,
even though you're careful.)

Leave one out in the sunshine for a few weeks, and see how long it lasts.

steve

reible · Post by **reible** » Thu Jul 25, 2013 9:27 am

I'm sure I'm a little late with this but I'm all into to using the right parts for doing coupling on a shopsmith, that being the shopsmith part. A coupling with out a shear component would worry me.

I still have my original one and have never broken one but I still like knowing that if need be it will be there to disconnect the power.

I grew up in a vacation area know for freshwater fishing. So my first practical view of shear pin applications came from seeing first hand why they were used. Those that thought they were not required did so at the price of a new prop and the nail they stuck in to save the price of a shear pin.

I'd also worry about the set screws going at a 90 degree angle and not fitting right on the tapered shopsmith shaft. Can't promise that will or will not be an issue but it is another thing to keep in mind. If a set screw were to come loose enough to spin on the shaft things could be pretty messed up....

Ed

billmayo · Post by **billmayo** » Thu Jul 25, 2013 9:49 am

reible wrote:II'd also worry about the set screws going at a 90 degree angle and not fitting right on the tapered shopsmith shaft. Can't promise that will or will not be an issue but it is another thing to keep in mind. If a set screw were to come loose enough to spin on the shaft things could be pretty messed up....

Ed

I have been using the krunled cup point set screw for many, many years in any area that I believed the set screw could come loose at the wrong time. Yes, it can leave an impression on the shaft but I find a quick lick with a metal file takes care of that problem. I use them in all the hubs as I normally do not change them. Of course, have 2 or more Shopsmiths helps prevent the need for having to change arbors and hubs. I do replace any krunled point set screw when you cannot see the krunls on the cup lip. I have used a few hundred of these set screws over the years. I cannot remember any of them coming loose.

JPG · Post by **JPG** » Thu Jul 25, 2013 12:46 pm

skou wrote:JPG, they act as a "shear pin" which is designed to fail before something else does. (Kinda like a mechanical "fuse.")

You're just doing it right. (but, since they are plastic, they will fail sometimes,
even though you're careful.)

Leave one out in the sunshine for a few weeks, and see how long it lasts.

steve

Another 'factor' in my 'original's' longevity is the material of which it is made. It is nylon and referred to as 'unbreakable(that means 'fail proof'?

) Zytel' in 'literature of the time it was made. Recent versions are of a much less durable plastic.

P.S. This thread(at this end anyway) has been related to using a lovejoy coupling for the 10E/ER Jig Saw. SS does not make that very short coupling any more, so a substitute need be used.