CO2 Lasers. - Oldal 28

Dátum/Date: Szerda, 2017-08-23, 12:29 | Üzenet/Post # 541

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tweakie, as I see the white plug has bad grip. The black one is the same style we have here. Nice work and good idea again!

Dátum/Date: Csütörtök, 2017-08-24, 12:53 | Üzenet/Post # 542

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tweakie, You have a lot of experience with CO2 lasers. Have You any idea why my chinese laser drops the beam power after a while? For example in a 50min long work the first 30min is OK, but after the engraving on mirror becomes weaker.

Dátum/Date: Csütörtök, 2017-08-24, 14:27 | Üzenet/Post # 543

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Hi Amator,

My first thought would be a rise in tube temperature.
(From tests carried out a few years back I found that maximum tube efficiency or output occurs at a gas temperature of 5 to 8 deg. C.
Tube efficiency then starts to drop off as the gas temperature increases).
Do you monitor the tube coolant temperature ?

I suppose a drop-off in performance could also be caused by a rise in the temperature of the High Voltage Power Supply Unit.
Perhaps fitting an additional cooling fan may help.
Does the indicated tube current show this reduction in performance ?

Other than this I don’t really have anything else to suggest.

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Csütörtök, 2017-08-24, 17:59 | Üzenet/Post # 544

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tweakie, I have a temperature meter in the coolant water, and when I engrave dots, it shows max 3°C rise over ambient. The deprez meter shows ca. 4mA and it's not possible to see if it rises.
Today I tried to cut plexiglass on maximum power, and suddenly the beam disappeard. The readout deprez shows nothing, even if I press the test button. How can I decide that the PSU or the tube went wrong?

Dátum/Date: Péntek, 2017-08-25, 05:39 | Üzenet/Post # 545

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Hi Amator,

In my opinion a 3deg.C rise in coolant temperature will not cause the problem you have described.

I have not discovered a fool-proof way to distinguish between tube and power unit failures. This is perhaps the reason why some of
the commercial laser suppliers replace both the tube and the power unit when called out for repairs.

Not much help really, sorry.

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Péntek, 2017-08-25, 15:02 | Üzenet/Post # 546

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tweakie, today I removed the PSU and found that the flyback transformer just blown, and round cracked.
Maybe the beam power loss was originated from here.
The question now is that the other parts of the PSU survived or not.

Csatolások/Attachments: 8146545.jpg(54.5 Kb)

Dátum/Date: Péntek, 2017-08-25, 15:13 | Üzenet/Post # 547

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Hi Amator,

It is encouraging that you have found something.

If you can get another transformer then it would be worth a try. The transformer is probably driven by a pair of MOSFET transistors (usually on a heatsink) and they need to be tested or possibly replaced as well.

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Vasárnap, 2017-08-27, 14:12 | Üzenet/Post # 548

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tweakie, I soldered out the FETs, and my tester shows both of them is OK. That gives Me a good chance that only the transformer is wrong. I ordered one to replace, now I wait.

Dátum/Date: Hétfő, 2017-08-28, 05:39 | Üzenet/Post # 549

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Hi Amator,

Good news that the FET,s are OK.
I will keep my fingers crossed that the new transformer cures the problem.

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Péntek, 2017-09-01, 06:23 | Üzenet/Post # 550

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Trees.

Tweakie.

Csatolások/Attachments: 7678597.jpg(43.3 Kb)

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Dátum/Date: Péntek, 2017-09-01, 12:49 | Üzenet/Post # 551

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tweakie, nice detailed image. What size is it? Which software?

Dátum/Date: Péntek, 2017-09-01, 14:44 | Üzenet/Post # 552

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Hi Amator,

That one is small at just 200 x 230 mm. It was produced using the Mach3 Laser / Impact engraving plugin from an image taken from the net.

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Kedd, 2017-09-05, 11:16 | Üzenet/Post # 553

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Another experience until I wait for the transformer:
Last time I was cutting plexiglas without help air, so the focus lens became rally dirty (mea culpa)
This fume normally hard to remove from the lens, even with isopropyl alcohol. I tried an active glass cleaner.
Just one litthe hiss, and the first wipe makes it clean! After that I used isopropyl to remove the remains.
Seems really good, does not hurt the coating.

Dátum/Date: Kedd, 2017-09-05, 11:24 | Üzenet/Post # 554

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Hi Amator,

Excellent.
Thanks for the tip.
Wurth make some really good quality stuff.

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Szerda, 2017-09-06, 18:35 | Üzenet/Post # 555

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Today I got the new transformer, I just couldn't wait to try out.
Here is the new one:

The old PSU seems OK, I just show the board if anyone interested:

I added a plus fan over the PSU's cover. Of course a round hole was cutted under the fan:

At the first try the PSU and the tube worked fine. Now I have a strong beam again. cool

Csatolások/Attachments: 4968983.jpg(104.6 Kb) · 1615326.jpg(115.9 Kb) · 7095277.jpg(111.4 Kb)

Dátum/Date: Csütörtök, 2017-09-07, 05:36 | Üzenet/Post # 556

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Excellent result my friend. respect

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

Dátum/Date: Csütörtök, 2017-09-07, 12:22 | Üzenet/Post # 557

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tweakie, I'm glad that the change of transformer helped. I wasn't attentive at buy, so the seller sent the item with DHL. It was really fast shipping for a plus cost.

maffia1

Dátum/Date: Péntek, 2017-09-08, 20:08 | Üzenet/Post # 558

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Tud valaki segiteni?
Van egy 40w co lézer lehet ezzel fémbe gravirozn(aluminium,vas)?

Dátum/Date: Péntek, 2017-09-08, 20:35 | Üzenet/Post # 559

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maffia1, üdv!
Direktben nem lehet, ahhoz a 40W kevés.
Eloxált aluról le tudod égetni a bevonatot, az egy járható út. Másik hogy a fémet lefújod cink spray-el, gravírozod aztán higítóval lemosod. Léteznek profi segédanyagok is, de nagyon drágák.