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Old 06-17-2018, 03:37 PM   #1 (permalink)
 
Join Date: Sep 2011
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Default Chinese Laser

Two years ago I broke down and bought a 40W Chinese laser. I am not tech wizard but I got it working and like the results - I use it for simple pen engraving - Names etc.
The laser is water cooled and you have a bucket/container of water and drop a small pump in it and it circulates water through the laser. Here is the problem I am having - after a few days the water turns slimy- I mean slimy - still clear but slimy! I am concerned whether or not this is hurting the laser? Also are there any options for me rather than a bucket of water? Are there any simple fixes?

Thanks for any suggestions!
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Old 06-17-2018, 03:54 PM   #2 (permalink)
 
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That sounds to me like a pretty hokey arrangement for cooling.

At the very least, you should change the water in the bucket after every use of the laser ... my opinion based on what you have stated about the slime formation.

I would also think that it would be quite safe to do away with the water pump and connect the coolant inlet hose to a household tap (with appropriate connector and water pressure regulator) and connect the coolant outlet hose to a drain.

Bear in mind, this is my "unqualified" opinion based on no experience with the kind of laser you are using, but also based on a lifetime of professional experience with other kinds of scientific equipment.
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Old 06-17-2018, 04:13 PM   #3 (permalink)
 
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Hi Keith .... I purchased an 80w Laser and have an Industrial Chiller to cool the water ... Heat is the enemy for any laser tube.

Chiller CW-5000 800W cooling capacity

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Old 06-17-2018, 04:25 PM   #4 (permalink)
 
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Mal - thanks and I agree - thats why I am looking for a solution! I'm hoping someone has an easy solution!
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Old 06-17-2018, 04:27 PM   #5 (permalink)
 
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Thanks Brian - It looks like the chiller costs more than the Laser did! (Almost!) THat seems like a lot of chilling for what I do. Do they make and can I get by with a smaller unit?

Do you think this will work?
https://www.ebay.com/itm/110V-CW-300...item25f4c607ef

I just found additional information. You have to add water to this and empty after use - not sure it buys me anything?
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Old 06-17-2018, 05:55 PM   #6 (permalink)
 
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Does it have to be water? I would think that a 50/50 antifreeze/coolant would work better for heat extraction.
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Old 06-17-2018, 06:23 PM   #7 (permalink)
 
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Actually, pure water is a better coolant (for heat extraction) than a water/antifreeze mixture.

https://www.reference.com/vehicles/d...qo=cdpArticles
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Old 06-17-2018, 07:03 PM   #8 (permalink)
 
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Fungus growing in your cooling water can indeed destroy your laser tube. I lost one tube that way. You can add a little bleach to your water to extend its working life.

I hope that helps,
Eric
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Old 06-17-2018, 08:25 PM   #9 (permalink)
 
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That's what I like about the Glowforge. Air and coolant are completely enclosed.
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Old 06-17-2018, 09:57 PM   #10 (permalink)
 
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Have you been to the k40 laser facebook page?
https://www.facebook.com/groups/888394261237059/
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