[TCML] my recommendation for a SRSG motor arbor
dave at leddon.com
Fri Nov 30 14:09:59 MST 2007
I do all of my layout work for this sort of thing on the computer using a
and then print the finished template which I then use as a drilling/cutting
guide. The first
time I did this I was surprised to learn that the printed output had an
accuracy greater than
I could measure by hand.
At 04:26 PM 11/29/2007, you wrote:
>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.
>--- Jon Danniken <danniken at comcast.net> 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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