In article
<a2dbc315-2a56-46c7-beda-303c44af23c9@d70g2000hsb.googlegroups.com>,
Ron George <
[email protected]> wrote:
> On Jan 24, 11:47 pm, Ralph Barone <invalid@not_real.ca> wrote:
> > I've thrown a few pictures of my modified Minoura HyperMag trainer up at
> >
> > http://members.shaw.ca/ralph.barone/Site/Bike stuff.html
>
> Ralph,
>
> How did you figure out exactly where to drill...if you care to explain
> to me your balancing procedure. They do this kind of stuff on
> turbocompressor impellers, but I never cared to find out how (probably
> much more sophisticated techniques)
>
>
> Ron
> http://cozybeehive.blogspot.com
Balancing isn't too hard to start off with. Spin the flywheel, and if
it consistently stops in the same position, drill a hole at the bottom
to remove some mass (the heaviest bit sinks to the bottom, n'est pas?).
Repeat... If the balance point starts flip-flopping, then you're
removing too much mass, so switch to a smaller drill bit. In the end,
the bearings in the trainer had too much friction, so I put an axle
through the flywheel and sat it on a pair of parallel surfaces. Doing
that got the balance almost good enough (it still buzzes a bit at
certain speeds). If you were balancing a turbocompressor, you would use
the same basic idea, but you would use MUCH better instrumentation and
you would also ensure that it was also balanced across the length of the
shaft (look up dynamic balancing).