Re: Balancing Rotery Disk???

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Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-uswest-dot-net>" <mystuffs-at-orwell-dot-net>

brian,
if your disk doesn't seem to be out that bad, what i did was let the
heavy side fall to the bottom and then turn it to the top and file a
little from each of the edges, across about 1.5" on my 10" disk. i
repeated this for the three times it took to get my disk to stop at
different points after a long, slow stop.
one question, are you satisfied that the vibration isn't due to rotor
runout in any way?
my rotor was only out of balance slightly but it always stopped as the
heavy spot fell to the bottom. i checked how much material that i might
need to remove prior to filing it by using a small amount of putty
smeared thin on the opposite edge of the heavy spot, this showed me that
i only needed a slight amount of filing. my rotor is made of 1" lexan so
if it needed a substantial amount of weight (or putty) my plan was to
drill several 1/8" dia. holes VERY shallow in an arc along the heavy
rim. if doing this be very conservative at each step because a little
goes a long way and you may find yourself fighting against the imbalance
you've created. i learned well when balancing pistons that a little at a
time is the only way to go. if you have access to a delicate scale you
could weigh the putty it took to get a good balance and then tape a
drill bit very shallow and drill a scrap piece of rotor material after
first weighing it, then weigh it after, this will give you an idea of
how much material to file or drill to get in the ballpark. this may be
getting to nitpicky, but i'm cautious at anything spinning at these
speeds and there is nothing worse then to file a little and have it
heavy the other way.
best of luck to you,
marc m.

Tesla list wrote:
> 
> Original poster: "raven0075 by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<raven0075-at-home-dot-com>
> 
> Out of balance rotary disk.
> After making the disk perfectly round and adding the electrodes I still
have a
> vibration problem, can you get these disks professionally made or is there a
> handy way to really get them balanced.
> 
> Thanks
> Brian W
>