[Noisebridge-discuss] Bench Supply and Laser Cutter?

Adam Munich adam at aperture.systems
Sun May 3 21:32:58 UTC 2015


Hah, well I'll be back in the bay later this week. I'm not actually a
member of NB, but if fixing stuff is required, that's my thing :-)

Cheers,
-Adam

---
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On Sat, May 2, 2015 at 3:25 AM, Zach <organic_unity at yahoo.com> wrote:

> Damn, Adam it sounds like it would be GREAT to have you around for
> calibrating.  Any chance you could drop by NB sometime when I'm there and
> spread the knowledge?
>
> Also, about the tools - there are ZERO needle nose pliers in the red bin.
> I am very familiar with the red bins.  Woodshop yielded zilch too.  I mean,
> there are a LOT of tools missing.  just saying.
>
> -Zach
> --------------------------------------------
> On Fri, 5/1/15, Adam Munich <adam at aperture.systems> wrote:
>
>  Subject: Re: [Noisebridge-discuss] Bench Supply and Laser Cutter?
>  To: "Torrie Fischer" <tdfischer at hackerbots.net>
>  Cc: "Noisebridge" <noisebridge-discuss at lists.noisebridge.net>
>  Date: Friday, May 1, 2015, 12:48 PM
>
>  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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>
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>
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>
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>  >
>
>  >
>
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