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| CO2 Lasers. |
| picengraver |
Dátum/Date: Péntek, 2014-06-27, 01:19 | Üzenet/Post # 381 |
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Tweakie,
You always make things look easy. 
Thanks,
John
I paint with a blue light beam. |
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| tweakie |
Dátum/Date: Péntek, 2014-06-27, 08:16 | Üzenet/Post # 382 |
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Thanks John. 
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Péntek, 2014-06-27, 18:46 | Üzenet/Post # 383 |
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tweakie, thanks for posting Your solution, I think it's very clever to set AND relation between PWM and laser trigger.
H1i.hu |
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| tweakie |
Dátum/Date: Szombat, 2014-07-05, 12:03 | Üzenet/Post # 384 |
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Just a short video demonstrating the PWM control of laser power (as detailed in post #381) enabling seamless engraving and cutting operations using Mach4 with the Darwin driver.
video
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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| tweakie |
Dátum/Date: Hétfő, 2014-07-07, 11:09 | Üzenet/Post # 385 |
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Some further thoughts on this…
By changing the active state of Output #1 to ‘active low’ the circuit can be simplified as shown below.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Kedd, 2014-07-08, 18:12 | Üzenet/Post # 386 |
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tweakie, good idea, I suppose this can not be more simple. Effective solution!
H1i.hu |
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| tweakie |
Dátum/Date: Szerda, 2014-07-09, 11:07 | Üzenet/Post # 387 |
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Thanks Zoltan.
I have been doing some testing with Mach4 and laser cutting / engraving - this little device provided a very easy solution to 'logic AND' the two signals. There are, no doubt, other ways in which it can be done but this method suits me.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Hétfő, 2014-12-15, 18:11 | Üzenet/Post # 388 |
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Hello friends!
I had a little time to prepare my cooler for the CO laser, here are some pictures.
I know it seems a bit chaotic, but theoretically it is correct, tests will come soon.
H1i.hu |
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| tweakie |
Dátum/Date: Kedd, 2014-12-16, 06:37 | Üzenet/Post # 389 |
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Wow !
That looks really neat Zoltan - excellent job my friend. 
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Kedd, 2014-12-16, 18:18 | Üzenet/Post # 390 |
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Thank You tweakie, it will turn out how fine the Nutella jar will work as a surge tank
H1i.hu |
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| tweakie |
Dátum/Date: Szerda, 2014-12-17, 06:47 | Üzenet/Post # 391 |
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Hi Zoltan,
I am sure that will work just fine and it will certainly cool to ambient, but please let us know how it performs.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Csütörtök, 2014-12-18, 18:01 | Üzenet/Post # 392 |
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Today afternoon I had time to work on the coolant for the laser.
I filled up with a mixture of 50% distilled water and 50% antifreeze. I had a little problem to fill the tubes and the pump without air inside, so the pump wasn't able to suck up the water. Forunately I could make a little pressure in the jar to make the liquid go through the pump, after that it was working. Now the pump is still running to surely remove the rest air.
The flow switch had a leak, so I had to remove from the system.
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| tweakie |
Dátum/Date: Péntek, 2014-12-19, 15:52 | Üzenet/Post # 393 |
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Hi Zoltan,
I think a flow-switch is a necessary safety precaution for protection of the laser tube.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Szombat, 2014-12-20, 06:15 | Üzenet/Post # 394 |
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tweakie, You're right, the flow switch is necessary, I'll take it back as soon as I found the leakage and could repair it.
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Dátum/Date: Vasárnap, 2014-12-21, 16:04 | Üzenet/Post # 395 |
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I found the leakage on the flow switch, was not hard to repair. Unfortunately it does not close its terminals. Turned out that the pump is very slow, I cannot measure but it takes ca. 2~3min to flow 0,5l. This flow isn't enough to push the flow switch. I have to change the pump or take a hall-effect flow meter and a circuit?
H1i.hu |
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| tweakie |
Dátum/Date: Vasárnap, 2014-12-21, 16:25 | Üzenet/Post # 396 |
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Just a thought, but my flow-switch has to be mounted vertically to operate properly.
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Vasárnap, 2014-12-21, 17:06 | Üzenet/Post # 397 |
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Thanks Tweakie, I demounted the switch to see what happens in vertical position, but it still wants more flow. Earlier when I repaired the switch, I was shortening the spring to be more sensitive, seems it couldn't help. Worked fine on dry, swithed by just blowing air into the tube. I thought the liquid will push enough.
I was searching the datasheet of the pump, and it says at 0m height the flow is max. 11 l/min. Although it maybe would be enough to cool, I'm sure the current performance is much weaker. Maybe the impeller is too used.
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| tweakie |
Dátum/Date: Hétfő, 2014-12-22, 07:07 | Üzenet/Post # 398 |
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Hi Zoltan,
The CO2 tubes do not need a vast circulation of coolant so I am guessing that your pump will be OK. Perhaps, as you mentioned earlier, a different type of flow-sensor is needed. ?
Tweakie.
Success consists of going from failure to failure without loss of enthusiasm. |
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Dátum/Date: Hétfő, 2014-12-22, 09:43 | Üzenet/Post # 399 |
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Tweakie, I agree, the coolant is enoug, the only problem is that I cannot detect the flow. If I choose another sensor, I think this kind will detect slow flow rate. The question is how to build a circuit what can sense if the impules slowing or lost.
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Dátum/Date: Hétfő, 2014-12-22, 13:09 | Üzenet/Post # 400 |
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It seems the good old 555 is able to detect a missing pulse.
Tweakie, where is connected the flow switch in Your laser? I think it can be good to open the firing pin. Or better shut down everything?
H1i.hu |
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