Just a small correction, 1) has happened *since* the lasercutter was labled out of order as a mirror check was part of my last maintenance.
Sol
The key?
m.
I think numbers 2 and 3 are largely down to "when things are broken
for a long time without visible change in status, people get
inquisitive and try to do their own investigation".
This email is a very large step in the right direction. Thank you.
-=- James Mastros / theorbtwo
That's problematic because the cooling water isn't in contact with the
outside of the tube. The tube should be at the same temperature as the
cooling water unless the pump is broken, in which case all bets are
off anyway.
--
Russ Garrett
ru...@garrett.co.uk
--
Nick Turner
Tyr of the Arcana
4) Something needs adding to the water to stop growths - does anyone
have any recommendations?
5) More people need a good training in servicing, too much burden is
being put on too few people to maintain and fix the cutter. We need
to acknowledge that servicing and maintenance takes significant time
and it is unreasonable to assume these responsibilities will be with
someone else... it's a community, step up and help!
Thank you for getting on the folks.
I agree with the point about the significant maintenance times etc.
I would very much like to learn how to service the laser cutter, so if
any one wants to schedule some time to actually show some of us that
would be great
t
On Mon, Aug 22, 2011 at 11:14 AM, asc <asc...@gmail.com> wrote:4) Something needs adding to the water to stop growths - does anyone
have any recommendations?
Use a 2% v/v solution of sodium hypochlorite (ie. 1 tablespoon of bleach per litre). It's basically the same stuff used in power station water cooling loops. (I'm assuming that the cooling loop never runs through metal, only plastic & glass - if it does, the increased free oxygen can accelerate corrosion by a very small amount.)
> Sadly it does pass through metal in the active cooling part of the system.
> Also just a small note, when the lasercutter was taken out of service the
> kink wasn't present, so I'm not sure if that will have contributed to the
> problems seen then...
> I have a cleaning rota on the wiki page, will adjust the time intervals to
> mean more regular maintenance.
As a first approximation why not just dump a cheap bottle (or two) of
vodka into the reservoir? Of course you could use some ethanol bought
from a chemical supplier too. I'm sure that it'll heat up in the laser
but I don't know if that will cause problems, depends on the heat in
the laser tube that they alcohol mixture is exposed to.
Ciarán
I'm not sure ethanol in that concentration is particularly harmful to
microbes. Yeast certainly will operate fine up to 18% ABV, and a litre
bottle of vodka in 25l of distilled water is only going to garner you
1% (plus whatever nutrients happen to be in cheap vodka to help the
microbes grow).
I think, as I've already said, that hypochlorite is the best bet,
although I hadn't considered the copper coil in the water cooler. I
wonder if it could be combined with a corrosion inhibitor?
--
Russ Garrett
ru...@garrett.co.uk
Beer line cleaner would keep the bugs at bay, not sure about what effect it
may have on copper though.
NIgle
Why not use the normal additives* with plain old distilled water ? Cheap that way.
Dw.
* http://www.accepta.com/water_treatment_chemicals/cooling_water_treatment.asp
After reading this is does look like the Done Thing is hypochlorite +
corrosion inhibitor. Any clues as to where we can get it in small-ish
quantities?
--
Russ Garrett
ru...@garrett.co.uk
The tubes are *glass* - as long as we're cooling the machine with
anything short of concentrated hydrofluoric acid, the tube is the last
thing which will be affected. The main issue is the cooling coil
inside the water cooler, which is copper.
> Do we have another spare tube? Or do we need to start the pledge for
> the next one now? :))
The laser cutter usage charges should cover that, at any rate.
--
Russ Garrett
ru...@garrett.co.uk
--
>
++++++++++[>+>+++>++
+++++>++++++++++<<<<
-]>>>+++++++.>++++++
+++++.+++..---------
.++++++++++.<<+++.<.
Alcohols arent toxic until about 30% in water.
Antifreeze is generally designed - as the name suggests - to stop
freezing. It's not antimicrobial at all.
--
Russ Garrett
ru...@garrett.co.uk
Apologies if I sound insistent -- I don't mean to! I really appreciate
the hard work you guys have put into this, and I'd love to help out with
the maintenance in future.
D
How large is large? Even if it is back in order then, it would be best
to ease it back into use than shock it with lots of usage....
Sol
D
You'll get blind-drunk
25 litres could be expensive, does yours have an ingredients list?
Robert
Beer line cleaner would keep the bugs at bay, not sure about what effect it may have on copper though.I think, as I've already said, that hypochlorite is the best bet,
although I hadn't considered the copper coil in the water cooler. I
wonder if it could be combined with a corrosion inhibitor?
NIgle
t
Will be there.
Sol
t
t