Re: [CAD_CAM_EDM_DRO] Re: noob laser question

Here is another suggestion. Use spark erosion. Mount two heavy electrodes
close to the spinning disk near the outer edge. Connect then to a capacitor
charged to a few hundred volts. For a trigger add two light electrodes that are
near the heavy electrodes and near the disk. Connect these to a triggerable
high voltage source like a car spark coil. When you fire the spark coil the
small spark will form a conductive circuit that will close the circuit for the heavy
contacts. The capacitor will then discharge through the disk and erode some
metal away.

You will have to experiment with voltages and capacitor sizes to get the amount
of erosion that you want. You will need to insulate your bearings so that no
current flows through them. This should be much cheaper than using lasers.

Pete.

----- Original Message -----
From: Cristi
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Saturday, January 19, 2008 4:54 AM
Subject: [CAD_CAM_EDM_DRO] Re: noob laser question


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
>





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