RE: Batch of Synchronous Motors - Nice 1/4" Hub

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mccauley, Daniel H by way of Terry Fritz <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>



	Actually, the jameco motor hub is 1/4" diameter and the motor i'm
using is 5/16" i am told.  I was simply going to measure the motor shaft
exactly and then re-bore the hole to the correct size.
	Dan



> Fair warning is given:
> 
> I'm a part of the Jameco fan base, but a set screw securing the hub to the
> motor shaft should have a tight
> tolerance between hub bore and motor shaft. Seems it would be best to
> simply make the hub to fit at a tight
> tolerance. In other words, wait for the motor, physically measure the
> shaft
> size (dial caliper) and build the hub.
> Although this hub might fit nicely, there's a good chance tolerances will
> separate. If they do, you'll end up with
> a wobbly rotor in a side/side motion (pain in the butt - been there, done
> that). Anyway, fair warning is given.
> Also, when mounting the hub (which ever is used) to a disk, make sure the
> hub shaft bore is completely centered to
> the rotor or you'll have a wobble of a different type (up/down vs.
> side/side motion). As you can see, I don't like
> set screws unless the bore to shaft is nearly a press fit. Personally I
> would search for a press center hub or
> similar method.
> 
> Take care,
> Bart
> 
> Tesla list wrote:
> 
> > Original poster: "Daniel McCauley by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>
> >
> > Regarding D.C. Cox's Synch Motors he is selling:
> >
> > I haven't heard the final on whether the shaft size is 1/4" or 5/16"
> > (hopefully 1/4"), but
> > i found a wonderful 1/4" hub which could be used in conjuction with this
> and
> > a rotor.
> >
> > Jameco Electronics is selling it for about $4.90
> >
> > https://www.jameco-dot-com/Jameco/Products/ProdCT/p172.pdf
> >
> > I guess even if his motors are 5/16" shaft diameter, you could machine
> the
> > hole an extra 1/16" without damaing the hub.
> >
> > Dan
> 
> 
>