Re: noob laser question

First off - there is no need to balance the disk at 30k rpm. More
managable speeds, such as 1,000 - 5,000 rpm, will allow balancing
just fine if you have dynamic balancing equipment. Second, if you
turn the disk on centers there will likely be no need for balancing
anyway, if you set it up properly.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "optics22000" <elliot@...>
wrote:

>
> Maybe than trying to balance the disk while it was spinning,

measure

> where it needs some mass removed while spinning, stop it, and cut

a

> bit off. Repeat.
> Any camera should be able to make a satisfactory picture, you just
> need a short illumination pulse (flash).
> At 30,000 rpm, 1° of rotation occurs in 5 µs. This is shorter

than a

> conventional flash can make. LED's can make very short flashes,

and

> at low duty cycles can be driven with much more current than their
> continuous rating. There are ways to make xenon tube flashes work
> faster too, basically use a smaller flash capacitor. These things
> are commercially available, an old timing light might work for

you,

> if it would work at 30000 rpm.
> This would be much safer than cutting material with a laser, and
> considerably cheaper too.
> It would be slower, so if you were working in production

quantities

> you'd probably want the laser.
> I used a high speed strobe to measure deformations of a scan

mirror

> with a shearing interferometer running at 5000 rpm, it worked

quite

> well.
>
> regards-
> Elliot
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Cristi" <wtherapy@> wrote:
> >
> > Hi guys,
> >
> > thank you for your answers, my question - can I use a lathe cut

tool

> > to make this balance ( so I can avoid buying and using that laser
> )? I
> > intend to balance the disc ( which has a shaft in the center ) by
> > suspending it on a ball bearing connected with 3 springs at 120
> grads
> > perpendicular on the axis of rotation. I hope this is a correct

way

> to
> > balance it... the disc should go up to 30000 rpm - can I do it
> without
> > the laser?
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler"

<grezmos@>

> > wrote:
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob Muse" <mtebob1@>
> wrote:
> > > >
> > > > Hi
> > > >
> > > > Look for a CO2 TEA laser on ebay. Very fast, high power
> pulse. One
> > > pulse will ablate a small bit of metal, you could probably
> balance it
> > > while spinning.
> > > >
> > > >
> > >
> > > I can only guess that is why he wants a laser else a file

might

> do the
> > > job.
> > >
> > > What is your budget? If it's small I doubt you have any chance
> > > getting something like this up and running.
> > >
> > > Graham
> > >
> >
>