Re: [CAD_CAM_EDM_DRO] Re: laser cnc

Hello All

Thanks for your emails inquiring about the small CO2 lasers I have for sale.

What I have are used CO2 laser tubes and matching power supplies. They are
both in good working condition and guaranteed to be functional when you
receive them. The laser is a sealed ceramic tube type with ZnSe optics
mounted on either ends of the tube which is mounted in an aluminum frame.
This laser emits invisible infrared radiation at a wavelength of 10.6
microns.

This wavelength is readily absorbed (read: good for cutting) by many
materials such as wood, plastics, paper etc. See the pictures-- all of these
engravings I did with one of these lasers mounted to the quill of my CNC
mill. No external gas supply is required for this system. The engravings
were done at a feedrate of between 40 and 80 inches/minute. If you have ever
wanted to experiment with a cutting laser, here's your chance to do so
without spending a small fortune. Both the laser and the power supply are
compact and light weight, the laser measures 1.0 X 1.5 X 17" both together
weigh less than 5 lbs. Basically, when focused, this laser will mark,
engrave, burn and/or cut thin materials such as plastics, wood and paper. It
will not cut through steel or aluminum, even very thin metals. It will pop
balloons across the room, it won't pop car tires!

MORE DETAILS:These lasers are from Domino Laser marking machines and are
rated at around 25 to 30 watts when new. The ones I have are, for the most
part, removed from working systems because their power has dropped off
somewhat. I have a number of tubes that measure between 10 and 21 watts. For
this measurement I use a Macken Instuments P-100 laser power meter. The
matching power supply provides approximately 240 watts of RF (radio
frequency) power at 27.120 MHz. There is an optocoupled modulation input
that is used to control the laser output. Input power requirement is 28 VDC
approx 10-12 amps. The coax cable that goes from the power supply to the
laser tube is included, as are the mating connectors for the power and
modulation input. I also supply hook-up instructions and other pertinent
information. I used a microswitch to turn the laser output on as the "Z"
axis of the mill moved down 0.020" and off as it returned to "0".

The gcode files for the engravings were all generated with free online
software. The line text engravings are vector files and the "CO2 Laser
Engraving" is a raster to vector conversion which can be used to reproduce
any bitmap image. In the "BUILD YOUR OWN LASER ENGRAVER", the "LASER" was
gone over three times, each pass offset .010" in X.

The laser must be mounted on a heat sink. The power supply has a built-in
heatsink I would also like to note that I used a ZnSe focusing lens, 5.0" FL
(not included in this auction, but not hard to find on eBay) mounted in a
holder that had compressed air jets to keep the optical path clear of smoke
and keep the lens clean. Not a hard thing to set up.

I still need to inventory and test the lasers I have which I will do today
and provide more info this afternoon. I also have a few lenses and 28vdc
power supplies. Generally speaking I will be asking around $300 for a tube
and RF power supply. The higher wattage ones may be a little more and the
lower wattage a little less. This price is what they sold for on ebay in the
last month. I have sold maybe 20 of these in the last few years and have had
no complaints.

Thanks

Bob Muse

----- Original Message -----
From: "Bob McKnight" <bobmcknight@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, September 03, 2004 6:24 PM
Subject: RE: [CAD_CAM_EDM_DRO] Re: laser cnc


> Help
> someone posted some CO2 Lassers for sale. I attempted
> to go to the site, but couldn't get there. Now I can't find
> the original posting that had the address. Anybody have
> that post, please forward it to me. Or if the know the asking
> price. I don't think I need over 5 watts for film cutting
>
> bob mcknight
>
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