Laser Tube Cooling

Methods of cooling laser tubes

Laser Tube Cooling

Postby Shawnturner » Fri Nov 17, 2017 7:58 am

Hello,

OK, so I have been running a few large vector cutting jobs over the past week and I can only get about an hour to an hour and a half before I find the water temps are just too high. (silly me working by feel and not a dang thermometer...)

Anyway, I have a bunch of long jobs coming up that I want to run so here is an idea I was contemplating. Chest Freezer.... I can get a small 5 Cu Ft one for less than $200. The nice thing about them is if I seal the drain I figure it would hold water nicely. Then I was thinking, just grab an Arduino, a 10 amp relay to switch the mains and a thermometer and presto, I've got a very simple (and reality cheap) water chiller. Not only would the reservoir be much bigger I'm guessing a small freezer could easily keep up with the load from the laser. Heck, you know what, if I just put it on the same power strip that I use to switch the laser on and off, I wouldn't even need the thermostat controlled relay!

I've seen people trying small bar fridges with a coil of tubing inside but that seems hokey to me. besides, wouldn't a chest freezer make for a great stand for the laser as well? LOL
I've also seen that the proper laser chillers like a CW5000 are just so expensive in comparison...
The more I keep thinking about this, the better the idea keeps getting!

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Re: Laser Tube Cooling

Postby Techgraphix » Sat Nov 18, 2017 10:00 pm

Can you keep the temperature stable? let's say 15 degrees Celcius?
Too cold and your tube will die too: below 10 degrees Celcius you wil get condensation, the difference in temperature will be too big so you might crack the tube.
To save a lot of problems you should just buy a decent cooler like the CW5000 or even the CW5200.
It costs a few more dollars but it assures you a longer life for your tube.
First i tried to keep my tube cold with radiators, ventilators, about 500W peltiers etc etc: in about a half year i wasted my tube... Then i bought a CW5000 water chiller, programmed it to 15 degrees and my tube lives for over 3 years now, excuse.. 4 years already.. No need for an extra waterpump, flowsensor etc.: it all in there and you can use its error signal direct to your controller.

But ofcourse you're free to experiment.. it's not my tube..

Kees
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