RE: [CAD_CAM_EDM_DRO] Re: noob laser question

Also, just so we are on the same page, can you tell us what you are trying
to do?

There are some really nifty and cheap solid-state gyros out there, there is
also some Commercial Off The Shelf (COTS) hardware that you might be able to
adapt with a lot less of a hassle-factor (and the cost of the hassle-factor
in a project can add up a lot faster than you can believe - ask me how I
know this...)

Totally understood if this is something proprietary but with a little bit of
knowledge, we can give better answers...


Cheers!
Dave

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Cristi
> Sent: Saturday, January 19, 2008 3:18 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] 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?
> > >
> > > --
> > >
> >
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> wanliker@..., timg@...
> Moderator: pentam@... indigo_red@...
> davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider
> this to be a sister site to the CCED group, as many of the
> same members are there, for OT subjects, that are not allowed
> on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.6/1231 - Release
> Date: 1/18/2008 11:55 AM
>
>

No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.19.7/1232 - Release Date: 1/18/2008
7:32 PM