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Fórum » Only in English » Technologies » CO2 Lasers. (Anything relating to CO2 Lasers can be discussed here.)
CO2 Lasers.
picengraver Dátum/Date: Vasárnap, 2013-11-10, 18:32 | Üzenet/Post # 361
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Very nice Dave (which is an understatement, for sure).
John


I paint with a blue light beam.
 
Dave Dátum/Date: Vasárnap, 2013-11-17, 03:52 | Üzenet/Post # 362
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Finally got around to trying the lasertile. It's got some kind of under-glazing that turns black when the laser hits it. The detail is amazing. I used 100% speed, 50% power, 500dpi. I think this is going to be my material of choice, just wish it was cheaper.
Dave

Csatolások/Attachments: 7132115.jpg(121Kb)
 
tweakie Dátum/Date: Vasárnap, 2013-11-17, 11:24 | Üzenet/Post # 363
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Nice work Dave - they just keep getting better and better biggrin

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Csütörtök, 2013-11-21, 23:30 | Üzenet/Post # 364
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Dave, that's very realistic.  Only missing the growl!
John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Csütörtök, 2013-11-21, 23:30
 
Dave Dátum/Date: Péntek, 2013-11-22, 14:35 | Üzenet/Post # 365
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Thanks guys,
I'm really pleased with how well the lasertile works. The laser's set so it just turns the under glaze dark, without burning through the top layer of clear glaze, so the surface stays smooth and unbroken. With the laser sensitive glazing, there's no need to backfill the image with anything, just wipe it off and it's good to go. With the right jig to hold the tile, and a properly cropped set of images, it's possible to make something much larger than could fit in the laser, like wall murals, etc.
Dave
 
tweakie Dátum/Date: Szombat, 2013-12-21, 12:59 | Üzenet/Post # 366
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Knowing how we all like gadgets I thought you may be interested in this little device I put together last week.

Simple and quick to construct using a combined voltage / current meter display (bought via the bay from China at about £7 inc. postage) 13 Amp plug, socket and cable plus a project box enclosure.

Its purpose is just to get an idea of the combined electricity running cost of the laser, air supply, cooler, extractor etc. under average / normal operational conditions for different types of job.

The first picture shows the readings I get with my Koi air pump, cooling system and laser running at low power during an engraving job. My compressor (only used for cutting thick stuff) and ducted fume extraction system were each measured separately.

As Watts = Volts x Amps my machine, during the average engraving job, uses (237 x 1.7) 402.9 Watts which is 0.4029 kW per hour of job time. Adding to this the figures obtained from the fume extraction system and using the price per kW hour from my energy provider I can get a pretty good idea of the machine running cost at least as far as the electricity usage is concerned.

I don’t intend for the gadget to be permanently left in circuit, although it may be handy to monitor any possible voltage drop on my supply at peak usage times, it is just used to establish the average electricity usage for different types of jobs.

The second picture shows the readings I get when cutting thin acrylic.

Tweakie.

Csatolások/Attachments: 6317565.jpg(33Kb) · 0024491.jpg(33Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Hétfő, 2013-12-23, 12:44 | Üzenet/Post # 367
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Very neat Tweakie.

Merry Christmas to You and Yours,
John


I paint with a blue light beam.
 
Dave Dátum/Date: Péntek, 2014-01-31, 23:31 | Üzenet/Post # 368
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Cutting wood or other flamable material is a real pain with the honeycomb cutting thing that came with the laser. It lays on the bed of the machine, so the honeycomb cells are covered by the workpiece, letting flamable vapor build up and burn the bottom side of the work. Built a pin table out of an aluminum plate and some 1/8" pop rivets (unpopped?). No more burning.
Dave



Csatolások/Attachments: 1869596.jpg(50Kb) · 1063227.jpg(61Kb)
 
picengraver Dátum/Date: Szombat, 2014-02-01, 03:25 | Üzenet/Post # 369
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Pretty neat Dave.

Glad to see a post from you.  I was beginning to think your laser was frozen solid. smile
John


I paint with a blue light beam.
 
tweakie Dátum/Date: Szombat, 2014-02-01, 09:22 | Üzenet/Post # 370
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Nice work Dave and excellent pin table as well.

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
Amatőr Dátum/Date: Szombat, 2014-02-01, 10:03 | Üzenet/Post # 371
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Dave, really good idea, thanks for sharing!

H1i.hu
 
Dave Dátum/Date: Szombat, 2014-02-01, 17:50 | Üzenet/Post # 372
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Thanks guys!
John, I think we sent the cold and ice stuff down where you are? It's sunny and warmer here today. biggrin
Looks like most of the commercial lasers have some sort of pin table as an optional feature, but they want hundreds of dollars for them. The pins on mine are pop rivets, with the pins super glued to the rivets, and all ground to the same length. The 12"x12"x1/4" aluminum plate was the most expensive part.
I place the pins in areas that the beam isn't going to hit, and in areas where there are large pieces being cut out to prevent a piece getting stuck at an angle where the laser head might run into it. The height of the pins allows the exhaust fan to pull smoke and flamable vapors from both sides of the work piece.
 
Dave
 
picengraver Dátum/Date: Vasárnap, 2014-02-02, 02:03 | Üzenet/Post # 373
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Dave,
We booted the ice back towards you.  Nice here this afternoon.  Had to turn the air conditioners back on. smile

Stay warm,
John


I paint with a blue light beam.
 
Dave Dátum/Date: Hétfő, 2014-02-03, 22:46 | Üzenet/Post # 374
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OK John, I just checked, and it's back. biggrin No need for the AC here.

Csatolások/Attachments: 2927156.jpg(173Kb)


Az üzenetet módosította/Modified by Dave - Hétfő, 2014-02-03, 22:47
 
picengraver Dátum/Date: Kedd, 2014-02-04, 00:02 | Üzenet/Post # 375
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Beautiful picture, Dave.  I'm so glad I'm not there. yes
John


I paint with a blue light beam.
 
Amatőr Dátum/Date: Kedd, 2014-04-29, 17:46 | Üzenet/Post # 376
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Hi guys!
I found an article about laser tricks, maybe some of them will be new or useable for You.
Link


H1i.hu
 
tweakie Dátum/Date: Csütörtök, 2014-05-01, 07:55 | Üzenet/Post # 377
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Thanks Amatőr very useful information.  ok

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
Amatőr Dátum/Date: Kedd, 2014-06-24, 08:33 | Üzenet/Post # 378
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Interesting tecnique with laser, bending the sheets:



H1i.hu
 
tweakie Dátum/Date: Kedd, 2014-06-24, 09:13 | Üzenet/Post # 379
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Hi Zoltan,

Thank you for posting the video. ok

I have tried that and yes it does work – but – the composition of the acrylic is altered by the laser process (certain chemicals are lost) and the bends are quite brittle as a result (they have nowhere near the strength produced by a conventional heat process bend). Basically, it may be good for some applications but it, in my opinion, has very limited practical usefulness.

Tweakie.

Csatolások/Attachments: 5137509.jpg(14Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
tweakie Dátum/Date: Csütörtök, 2014-06-26, 12:02 | Üzenet/Post # 380
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Something I keep getting asked about is CO2 laser output power control by using the Mach3 generated PWM signal and the Sxxx command in the GCode program. This is not something I prefer to do as I always treat engraving and cutting toolpaths as two different operations separated by a tool change. However, PWM control had to be done.

Well, pre-set laser output power is not a constant – it will vary dependant on tube temperature and it’s cutting / engraving ability will also vary dependant on ambient temperature as well as the type of material and it’s moisture content etc. etc. As a result a GCode program with a defined power setting may run just fine today but may need some adjustment to run just as well tomorrow.

There is always more than one way to accomplish anything but this is the best solution I have come up with so far. It does however need a bit of extra hardware to function but this is simple enough to make and just fits inline with the LPT cable to the machine.
The maximum laser power is still manually set and the GCode Sxxx command controls the actual laser output power between (approx.) 0% to 100% of the maximum that has been set. This allows for the laser output power variations, mentioned above, to be compensated for and adjusted on a day-to-day basis without having to make any changes to the GCode program.

This method basically gates together the Mach3 PWM signal with the M11P1 / M10P1 command codes on Output# 1 just by using a pair of opto-couplers and the LED series resistor values have been chosen to present a loading on the LPT port of no more than 5mA per pin which is well within it’s capability.
This method negates the set-up time delay associated with switching the PWM signal with the M3 / M5 commands by leaving the Mach3 PWM signal constantly running then just applying it as required with the M11P1 / M10P1 commands. Provided any changes to the laser output power are commanded by entering the Sxxx command on a separate line in the GCode no delays in changing power levels have been noticed and engraving / cutting within the same program is easily accomplished.

The circuit is extremely basic and can be easily made and fitted to an existing machine (which is controlled by the LPT port, of course) and the following pics. Show just what I have done.

My Mach3 set-up is as follows (please note - your pin numbers may be different).

PWM base frequency 500
Minimum PWM 0
Relay – M3 Output #2
Spin up / down delays all 0
Spindle √ 17 0 X X 1 1
Output #1 √ 1 16 X
Output #2 √ 1 9 √
Spindle pulley 1 Min speed 0 Max speed 100 Ratio 1

The GCode program uses M3 followed by Sxxx (0 to 100) which is essentially percentage of full power. Thereafter changing power by entering a new Sxxx command and the laser is switched on / off by the M11P1 / M10 P1 commands. The program then has M5 at the end.

Nice little project for a rainy day perhaps ?

Tweakie.



Csatolások/Attachments: 0668000.jpg(21Kb) · 9311003.jpg(55Kb) · 2045992.jpg(55Kb) · 5822904.jpg(91Kb)


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