Re: [CAD_CAM_EDM_DRO] Re: laser cnc

Rick
I have about a dozen driver boards, not a clue, just remember that
they have a Z80 processor I can't remember (if ever knew) wha
the output devices are, but it seems that there were 2 outputs \
that were not identical. It seems that one had about 8 devices.

Then I have about another dozen stepper motor with drivers
in a cabinet . The motors are like the MAXNC mini mill uses.
I started getting manuals together and need the power connectors
before I sell them. I had to take them all. I just wanted one or two
to make a 4th axis for a couple of mini mills. They too are out in the
shop.

Do you think the traveling mirror is within the capabilities of a pen
plotter frame. That would really be neat to have the lased and
power supply mounted at one end and a mirror on the pen holder.
I question whether my talents are good enough for that close
tolerance work. My projects are usually measured in feet and inches
and have lots of welding.

bob mcknight





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob McKnight"
<bobmcknight@c...> wrote:

> Rick
>
> Thanks a whole bunch. Went to my Browser and typed
> Laser Cutting. What a fantastic start. We have been
> wanting to turn a pen plotter into a cutter for vinyl. Have
> only looked at knife tech
> nology. This may be better, most
> of the problems of the knife disappear with the laser. Of
> course, some others show up. And then they mentioned
> the Laser Printers. That might be a source of parts, only
> I doubt if the laser is powerful enough to cut the vinyl film.
> Speed is not a concern. Another site had all kinds of Algebra
> formulas for determining the power and speed necessary. Didn't get
> to the Synrad site, but saw several good comments about it.
>
> bob mcknight

I don't think my cnc mill/laser can even go fast enough to NOT cut
vinyl, and I can move at 120+ IPM. I assume you are talking thin
stuff, like signs are made out of.

My next step is to build a flying lens system, since there are no
forces on the laser beam. It is really overkill to be using my cnc
mill to move the laser and workpiece. Much better to move a mirror
(s) and the lens and have the laser fixed. I may go ahead and build a
smallish gantry for this (maybe 24" by 24") and then later build a
bigger unit. The trick is to make something that can accelerate
really fast, and that means low mass. I haven't decided on the
actuator yet, but I am thinking low-stretch timing belts and brushless
servo motors. I have been getting brushless motors on ebay for dirt
cheap...if only I could find the right type of driver. I want to be
able to use encoder velocity control with EMC and a PCI card by
Abdul.
Most of the driver amps use tach velocity control, or current
control. Well, let me rephrase..I know where to buy the brushless
drivers new, but I want something cheap! :-)

Rick



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