RE: RSG unbalance

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Terry Oxandale" <toxandale@xxxxxxx>

I ran into the same problem with my phenolic material disk. Fortunately, the
shaft spun with minimal friction and the slightest off-center weight
eventually would "pendulum" to the bottom of the disk. To balance it (and it
would take various RPM settings to finalized the balancing) I would let the
heavy end sink, mark it, and then drill a small 1/8" hole in the disk. Then
with a steel screw (6-32 I believe) I would insert it into the hole and spin
the disc up and watch and listen for vibrations. Sometimes I had to add a
nut, a washer, and maybe two washers to get it to balance. Other times I had
to go the other way and use a nylon screw and nut (much lighter) to get it
right. But after about an hour of playing with it, it balanced out fine.

(Un)Terry

 -----Original Message-----
From: 	Tesla list [mailto:tesla@xxxxxxxxxx]
Sent:	Thursday, December 16, 2004 4:06 PM
To:	tesla@xxxxxxxxxx
Subject:	RSG unbalance

Original poster: Rob Maas <robm@xxxxxxxxx>

Hi All,

I am in the process of building an RSG. The disk spins at
2950 rpm (the motor is asynchronous, mains frequency is 50 Hz).
The first trial run indicates a slight unbalance. It is
probably OK, but if possible I like to improve the balance of
the disk. Is there a systematic method to do this 'on line',
i.e. with the disk mounted on the motor shaft?

In a garage they use equipment to balance wheels: after a short
spin the apparatus spits out what balance weight should be
placed where on the rim to balance the wheel: anybody knows what
the principle of operation is here?

thanks in advance,   Rob