I did something similar, only with cruder tools. I
made my disk out of G-10. I marked the center and four
quadrants using a divider, then cut my circle. I then
drilled the center hole and mounted my arbor. I
mounted it to my srsg motor and rotated it while
holding a pencil near the edge, to mark the perfect
distance from the center. I then spun the rotor by
hand and used a dremel with a sanding drum attached,
to get the circle close to perfect as I could. I then
cranked up the srsg motor and used the dremel again to
fine tune it. Finally, I drilled the four electrode
holes. It ballanced just fine at 1,800 rpm.
Adam
--- Jon Danniken <danniken@xxxxxxxxxxx> wrote:
> Thanks, Terry, I hadn't thought to use a divider
> before. Your finishing
> method on the lathe (under reduced power) also
> sounds good.
>
> Jon
>
> --- Original Message -----
> From: "Terry Oxandale"
>
>
> When I built my first one, I got it pretty close
> based upon the use of a
> divider and scribed arcs to find the center of the
> disc, then laid the
> flange onto this center mark and proceeded to mark
> the mounting holes.
> Then I rigidly mounted the motor/disc assembly in
> place, and while the
> motor rotated under reduced voltage, I used a lathe
> cutting tool set-up
> to carefully turn the OD of the disc until there was
> no run-out, and
> this resulted in a balanced disc. I used a variable
> AC supply initially
> to avoid high RPMs in the unbalanced state until
> this was done. The G-10
> cuts very easily.
>
>
>
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