Re: noob laser question

Hi,

Just need to remove very small ( tenths of miligram ) pieces from that
disc. The disc is about 50 mm diameter and about 30 grams weight or
smth like this.
I really need to balance them as I intend to use them in an inertial
platform, so I would like to remove vibrations as much as possible. I
know I can add low-pass filters to the accelerometers for vibrations,
but I prefer not. I would like to know if I can balance it using a
lathe cut tool so I can avoid the laser.
Balance is done holding the disc with a ball bearing suspended with 3
springs, in perpendicular plane to the axis of rotation.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, hannu <hvenermo@...> wrote:
>
> Its a specialised supply, from what I´ve read. Very special. They have
> to be made for this use, and use very high voltages and sometimes high
> currents. For small, hobby size applications a "neon transformer" in
the
> 20 kV range is supposed to be useful, for more powerful ones the
> voltages go up ... dangerous if mishandled and the design know-how is
> less common.
>
> Metal-cutting lasers start at 200 W I believe, again, from what I´ve
> read, and what one Spanish oem told me (who sells them).
> I believe the range for useful metal-cutting lasers starts at about
> 1500-2000 $ - there are several oem products form china now in the
> marketplace, cnczone had quite a lot about them at some point.
>
> How big is the disc ? How heavy ?
> If the disc is not very heavy, I don´t think 30 k rpm is in any way
> difficult for a turned disc on a lathe.
> Standard, cheap, small bearings commonly allow these sorts of
speeds. So
> do ceramic ones that go to much higher rpm´s, and are not expensive in
> small sizes. VBX on ebay will have some.
>
> Do you need many, for production ?
> If you started with flat ground stock, like from starret (is in the
us),
> I believe you would just need to turn the outer edge and you would be
> *very* close. Another option would be to have it precision ground ...
> for a small disc, already turned, the grinding should be cheap and easy.
>
> Another matter is if´s heavy (like a flywheel that stores energy) -
> these can be very dangerous due to the amount of energy and the
> catastrophic failure potential. If it fails, its literally a bomb as
the
> energy has nowhere to go.
>
> Depending on your needs, you might be able to get one from a failed
gyro
> in an airplane. It might be cheap, if you can find one, and its not in
> use any more, as they are then worthless. The current ones are very
> expen$ive. They have excellent bearings.
> Oh, and for gyro use, a vibrator is commonly used to make them more
> sensitive. Kind of like a mechanical buzzer in the case, by creating a
> "buzz" it makes the gyro more sensitive. Like tapping a mechanical
dial.
> About 200 hz iirc ...
>
> Cristi wrote:
> >
> > Found 20 Watt, 40 Watt and 80 Watt "CO2 10600nm Laser for OEM
> > application" on ebay - are they powerful enough? Don't have the
> > smallest clue about the power required. Prices go from US $195.00 to
> > US $799.00 for 80 Watt. What supply should I use for these lasers?
> >
> > --
> >
>