Re:Boring new shaft bores - Nice 1/4" Hub

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <kreld-at-juno-dot-com>

Dan, all

 If your going to enlarge the bore from 1/4" to 5/16, try and find a
stepped ream instead of a drill bit.  A drill bit may "bite" off center
when drilling causing a bad alignment problem.  A stepped ream will
center in the original hole and make for a more accurate alignment.  I
believe Grizzly industrial (mail order) www.grizzly-dot-com   carries reams
for a reasonable price.  Theirs are not stepped however.  Maybe Harbor
Frieght ?

  Even with this, a lot of times after you install a rotor disk, you will
find some wobbles.  I find the best solution is just chuck the motor
armature in a lathe with the hub attached and true it up.   

  If there is room on the hub, drill & tap another setscrew hole inline
with the original, this will also help keep the hub true on the shaft. 

>Kevin E.

>
>
>	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
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