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

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

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