[Noisebridge-discuss] Bench Supply and Laser Cutter?

[Adam Munich]

I have one of those full spectrum models ( its at Sudo room right now)  and
it's not an incredibly complex machine. I would say that wiring up the
laser tube would take only about 1 minute, the difficulty is aligning the
laser there after adjusting all the mirrors.

Last time I did this I used polycarbonate glasses ( which are opaque at
that wavelength ) and a magnet over the safety switch sensor to make the
machine think it wasnt open. I then held down the later test button and
used a piece of cardboard to determine where the beam is and where it
should go, and adjusted accordingly.

If anybody wants to take a stab at it, doing it that way shouldn't take
more than 30 minutes.
On May 1, 2015 12:47 PM, "Torrie Fischer" <tdfischer at hackerbots.net> wrote:

> We've got a huge bin of screwdrivers in the dirty shop. Needle nose pliers
> tend to end up in the big red rolling toolbox.
>
> On Friday, May 01, 2015 01:07:06 AM Zach R wrote:
> > Thanks for info everyone.
> >
> >   That's great, I thought it was broken way worse.  I can bring my tools
> > over and look at it next week.  NOTE, we do not have ANY needle nose
> pliers
> > and the dozens of tools I donated last month (lots of screwdrivers and
> > such) were nowhere to be found on monday.  Makes doing these repairs
> really
> > difficult cause I have to bring my tools from home...just an fyi for
> > everyone to keep an eye on what we have.
> >
> > Do  you know more about the brass contact it uses?  Id be down to order
> > another on ebay rather than replicate / jerry rig something for such a
> nice
> > piece of equipment.
> >
> > -Zach
> >
> > Date: Thu, 30 Apr 2015 14:37:23 -0700
> > From: metatecque at gmail.com
> > To: tdfischer at hackerbots.net
> > CC: noisebridge-discuss at lists.noisebridge.net
> > Subject: Re: [Noisebridge-discuss] Bench Supply and Laser Cutter?
> >
> > I did a little maintenance on the laser cutter a year and a half ago,
> there
> > should be a brass connection on the left side. .. if you duplicate this
> > connection on the right you will be good to go, do not solder directly to
> > the tube, you can remove the rubber insulation on the right and solder a
> > brass crimp connector to the wire.
> >
> > Blessings,
> >
> > Hilaire
> > On Apr 30, 2015 12:04 PM, "Torrie Fischer" <tdfischer at hackerbots.net>
> wrote:
> > The laser tube needs wired up. It is sitting inside the tube compartment
> in
> >
> > the laser cutter itself. Thats about as much as I know :)
> >
> > On Thursday, April 30, 2015 07:29:48 AM Zach R wrote:
> > > Hey all,
> > >
> > >   It was great to see some of the old faces at NB on Monday.  We had
> > >   Michael
> > >
> > > L, Rubin, Jake, Miloh, Kevin and some other peeps of the OG variety
> > > holding
> > >
> > > it down !  Felt like old times :)
> > >
> > >
> > >
> > > Me and Jake took a stab at the blown bench supply that everyone was
> using
> > >
> > > for years (the 15V x2 output adjustable one).  It's seen a lot of use,
> > >
> > > love, and abuse and it would be nice to have it going again.  It has
> been
> > >
> > > moved to the hackershelves now since it was taking a lot of time to
> repair
> > >
> > > and it got late.  Here is the diagnosis I made:
> > >
> > >
> > >
> > > 1) both outputs are good voltage-wise and adjust properly
> > >
> > > 2) Current control on both sides is shot, appears worse on the left as
> it
> > >
> > > actually displays a negative number (hah) 3) I believe the current is
> > >
> > > controlled by 2 logic chips using a sense resistor.  Those chips are
> > > CD1044
> > >
> > > and CD4066 I believe. 4) I recommend replacing those chips and / or
> > >
> > > investigating the current control circuitry on the power converter
> board.
> > >
> > > 5) Note power converter boards have 2x pico fuses each that check out
> fine
> > >
> > > (they are yellow)
> > >
> > >
> > >
> > >
> > >
> > > And I've been meaning to ask: what exactly is wrong with the laser
> cutter?
> > >
> > > Does it need some expensive part?  I would LOVE to take a stab at
> > > repairing
> > >
> > > this since its one of the finest pieces of machinery we have at NB.
> > >
> > >
> > >
> > > Best,
> > >
> > > Zach
> >
> > _______________________________________________
> >
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> >
> > Noisebridge-discuss at lists.noisebridge.net
> >
> > https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >
> >
> >
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