Old 01-08-2015, 09:52 AM #1
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Exclamation Cheap CO2 Possibly?

So I was checking my emails from Banggood and noticed a 40W C02 Laser tube on there for $145USD Heres the link 40W 70CM CO2 Carbon Dioxide Laser Tube Laser Engraving Part Sale-Banggood.com

I Know the bare minimum about gas lasers and there price, Im not recomending this tube or advertising for BG either,
I Simply wanted others to check it out,
could be a good deal? could turn up damaged from cheap shipping methods? who knows..........

Excuse me if this item has already been mentioned in another thread

CheerZ


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Old 01-09-2015, 04:14 AM #2
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Default Re: Cheap CO2 Possibly?

Hmm, from what I can tell it's a fairly good deal. I mean, it's not a great deal, but after looking, it's the best price I can find. Wouldn't trust that free shipping though, especially on something made entirely out of glass
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Old 01-09-2015, 06:22 PM #3
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Default Re: Cheap CO2 Possibly?

additional costs:

1) a decent power supply doing 15kv at about 18mA (~250$)
2) submersible water pump (20$)
3) water cooling radiator and fan (80$)
4) safety goggles (40$)
5) ZnSe lens (50$)

etc..

these low quality chinese tubes might give you a thousand hours of operation if you're very lucky and keep it cool and under driven.

still, for a not huge amount of money, you'd have enough power to do cutting of non-metallic thin objects and etching on leather, glass, wood, etc.

Quote:
Originally Posted by RYDorDIE278 View Post
So I was checking my emails from Banggood and noticed a 40W C02 Laser tube on there for $145USD Heres the link 40W 70CM CO2 Carbon Dioxide Laser Tube Laser Engraving Part Sale-Banggood.com

I Know the bare minimum about gas lasers and there price, Im not recomending this tube or advertising for BG either,
I Simply wanted others to check it out,
could be a good deal? could turn up damaged from cheap shipping methods? who knows..........

Excuse me if this item has already been mentioned in another thread

CheerZ
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Old 01-09-2015, 06:44 PM #4
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by swamidog View Post
additional costs:

1) a decent power supply doing 15kv at about 18mA (~250$)
2) submersible water pump (20$)
3) water cooling radiator and fan (80$)
4) safety goggles (40$)
5) ZnSe lens (50$)

etc..

these low quality chinese tubes might give you a thousand hours of operation if you're very lucky and keep it cool and under driven.

still, for a not huge amount of money, you'd have enough power to do cutting of non-metallic thin objects and etching on leather, glass, wood, etc.
I thought this might be the case with the extra expenses, 40W is also probably how much juice is going in and not the true laser power coming out,
Chinese stuff does break often so maybe even 1000 hours is generous, you might get a Dud that breaks alot earlier,
thankZ Swami
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Old 01-09-2015, 06:58 PM #5
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Default Re: Cheap CO2 Possibly?

Safety goggles wont cost 40USD ... , Even 50p Plastic goggles will work perfectly fine .

Quote:
Originally Posted by swamidog View Post
additional costs:
4) safety goggles (40$)
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Old 01-09-2015, 07:08 PM #6
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Default Re: Cheap CO2 Possibly?

yes.. given the tube length, it's probably more like 30 watts on a good day.

Quote:
Originally Posted by RYDorDIE278 View Post
I thought this might be the case with the extra expenses, 40W is also probably how much juice is going in and not the true laser power coming out,
Chinese stuff does break often so maybe even 1000 hours is generous, you might get a Dud that breaks alot earlier,
thankZ Swami
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Old 01-09-2015, 07:11 PM #7
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by ionlaser555 View Post
Safety goggles wont cost 40USD ... , Even 50p Plastic goggles will work perfectly fine .
i posted the price of actual goggles. polycarb glasses from the hardware store should work, but i would rather use something i *know* will work.

10600 nm CO2 Laser Safety Glasses
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Old 01-09-2015, 07:16 PM #8
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by swamidog View Post
i posted the price of actual goggles. polycarb glasses from the hardware store should work, but i would rather use something i *know* will work.

10600 nm CO2 Laser Safety Glasses
I agree , But any hardware store plastic goggles will Work for 10600nm unless they have holes in .
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Old 01-09-2015, 07:20 PM #9
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Default Re: Cheap CO2 Possibly?

You also have to remember that once you have all of the extra things required to run it, when it breaks you only have to replace the tube, not all of it. So even if you do only get 1000 hours out of it, 1000hrs for $145 isn't too bad .
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Old 01-10-2015, 12:59 AM #10
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by swamidog View Post
these low quality chinese tubes might give you a thousand hours of operation if you're very lucky and keep it cool and under driven.
What's the failure mode?

Quote:
Originally Posted by swamidog View Post
polycarb glasses from the hardware store should work, but i would rather use something i *know* will work. [link]
Read your link. Those are also "polycarb glasses from the hardware store"
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Old 01-11-2015, 12:25 AM #11
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Default Re: Cheap CO2 Possibly?

Cooling can be accomplished by simply running tap water down the drain for
testing and setup. Just maintain a good flow of cooling. I used a windshield
washer pump (cheep) and not submersed. Also, you don't need a radiator or
fan for starting. That is for closed circuit cooling in a near CW operation.
The beam quality is pretty impressive with no lens. True, if you need a small
dot, ZnSe is the way to go but handle carefully.
My first tube failed very fast. With water cooling and all, it went POP on the third
5 second run. No guessing -- a glass weld inside failed filling the cavity with water
which killed my old PS. The guy in CHINA called me a liar and untrustworthy !!!
Have FUN with the GASSSSS ---- HMike
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Old 01-11-2015, 03:06 AM #12
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by Hemlock_Mike View Post
The guy in CHINA called me a liar and untrustworthy !!!
Lolwut? The seller called you untrustworthy? What's he gonna do, not sell to you anymore? After calling you a liar I really don't think you'd even consider buying from him again. Pretty typical, lots of Chinese sellers will do this kind of thing. Granted, a lot won't, but the ones that will are still there. Also, what's the seller's name so we can avoid him?
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Old 01-11-2015, 03:24 AM #13
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Default Re: Cheap CO2 Possibly?

for testing and setup, yes. but for any real application, you're going to want a recirculating cooling system.

i have a 60W here that i use both a radiator and an industrial chiller on.

i keep my water at around 20c and i live in the southwest, so i need active cooling.


Quote:
Originally Posted by Hemlock_Mike View Post
Cooling can be accomplished by simply running tap water down the drain for
testing and setup. Just maintain a good flow of cooling. I used a windshield
washer pump (cheep) and not submersed. Also, you don't need a radiator or
fan for starting. That is for closed circuit cooling in a near CW operation.
The beam quality is pretty impressive with no lens. True, if you need a small
dot, ZnSe is the way to go but handle carefully.
My first tube failed very fast. With water cooling and all, it went POP on the third
5 second run. No guessing -- a glass weld inside failed filling the cavity with water
which killed my old PS. The guy in CHINA called me a liar and untrustworthy !!!
Have FUN with the GASSSSS ---- HMike
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Old 01-11-2015, 03:40 AM #14
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by swamidog View Post
additional costs:

1) a decent power supply doing 15kv at about 18mA (~250$)
2) submersible water pump (20$)
3) water cooling radiator and fan (80$)
4) safety goggles (40$)
5) ZnSe lens (50$)

etc..

these low quality chinese tubes might give you a thousand hours of operation if you're very lucky and keep it cool and under driven.

still, for a not huge amount of money, you'd have enough power to do cutting of non-metallic thin objects and etching on leather, glass, wood, etc.
Wo, an electronic NST on eBay does 20ma at 15kv for $65.
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Old 01-11-2015, 03:45 AM #15
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by USAbro View Post
Wo, an electronic NST on eBay does 20ma at 15kv for $65.
a neon sign transformer and variac could work. i don't know that that starting pulse would be high enough. you'd probably need ~20kv to trigger and i'm not sure how well it would modulate.

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Old 01-11-2015, 03:48 AM #16
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Default Re: Cheap CO2 Possibly?

Quote:
Originally Posted by swamidog View Post
you'd probably need ~20kv to trigger
15kVrms is 21kV peak

Quote:
Originally Posted by USAbro View Post
Wo, an electronic NST on eBay does 20ma at 15kv for $65.
You missed the part where he said decent power supply. You could use a $0.30 brick as safety goggles, and you could use a free fern leaf as a fan, but we're talking about a decent setup here.
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Last edited by Cyparagon; 01-11-2015 at 03:50 AM. Reason: added quote
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