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Fórum » Only in English » Technologies » CO2 Lasers. (Anything relating to CO2 Lasers can be discussed here.)
CO2 Lasers.
tweakie Dátum/Date: Kedd, 2012-08-28, 12:00 | Üzenet/Post # 21
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This is the inside of the enclosure.

The tube sits on the two mountings, held in place by the elastic bungee cords and the laser beam exits through the small hole in the far end (hopefully).

Tweakie.

Csatolások/Attachments: 3026491.jpg(56Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
Amatőr Dátum/Date: Szerda, 2012-08-29, 16:51 | Üzenet/Post # 22
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tweakie, that eclosure is absolutely Your work, isn't it? I mean You made not bought.

H1i.hu
 
tweakie Dátum/Date: Szerda, 2012-08-29, 17:01 | Üzenet/Post # 23
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Quote
tweakie, that eclosure is absolutely Your work, isn't it? I mean You made not bought.


Hi Amator,

Yes sir, it was all constructed by me. My WebPage

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
Amatőr Dátum/Date: Szerda, 2012-08-29, 17:21 | Üzenet/Post # 24
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tweakie, I knew smile Nobody sellls so high quality in the market.

H1i.hu
 
tweakie Dátum/Date: Szerda, 2012-08-29, 17:36 | Üzenet/Post # 25
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biggrin biggrin biggrin

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
tweakie Dátum/Date: Szerda, 2012-09-19, 17:12 | Üzenet/Post # 26
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Based on the excellent results Jeff (JJWMACHINECO) has achieved with burning ‘shades of grey’ into wood and as an alternative method to John’s (PicEngraver) all software method (PicLaser) of producing shades with a diode laser...

There are those that have converted imported CO2 laser machines to operate with Mach3 who do not actually have a motorized Z Axis and others who perhaps do not wish to add an encoder to their existing Z Axis. For this scenario I submit the following design idea which is primarily aimed at CO2 lasers with 40 Watts (or more) available output power.

Because the Mach3 internal PWM generator cannot easily be controlled ‘on the fly’ with the S*** commands blended with X Axis movement, or at least not fast enough to be useful, another approach has been considered.

As mentioned in a previous post - it is perfectly feasible to construct a ‘stand alone - step / direction’ controlled PWM generator the output of which is easily converted to a voltage with a simple DAC (digital to analogue converter). Then, as Amator mentioned, by using 2 voltage dividers, one to set the lower voltage at which the wood is just marked and the other to set the higher voltage at which the maximum burn is achieved the laser output power can be fully controlled (via its PSU), with 8 bit resolution, from a lithophane type GCode tool-path.

I threw out the initial idea of connecting an encoder to a stepper motor and then using a standard stepper motor driver in favour of an all electronic solution which will enable ‘on the fly’ adjustment of the minimum and maximum thresholds whilst still maintaining an 8 bit resolution of voltage over a typical 2mm depth of lithophane tool-path.

My design may well be a bit theoretical at the moment but so far I have established that a PIC microprocessor, clocked at 20MHz, can be configured within Mach3 as an Axis which can then be driven at a typical feed-rate of 1000mm/min with 127.5 steps/mm and produce a continuously updated PWM output between 0 and 100%.
Referring to my very basic schematic, this PWM is then opto-isolated, to remove the GND constraint and place the 255 step output potential between the maximum and minimum voltage settings of the two potential dividers. A simple DAC is then used to drive the emitter-follower output voltage to the laser PSU.

For the initial testing and for convenience, I am using a partially populated pcb from my RF Laser controller design purely because the display is useful, at the software design stage, to be able to observe the various settings and values. The final design will be a lot less complicated.

As always, early days yet but it all looks promising.

Tweakie.



Csatolások/Attachments: 9312543.jpg(55Kb) · 4658437.jpg(56Kb) · 1566306.jpg(26Kb) · 0093691.jpg(17Kb)


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Amatőr Dátum/Date: Szerda, 2012-09-19, 21:05 | Üzenet/Post # 27
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tweakie, nice design, I really like it and hope it will work as You plan.
Quote (tweakie)
The final design will be a lot less complicated.

Do not remove the display, it's so cool! smile
Your proto sems like my final work, my protos are made in spaghetti-design.
Waiting for further results.


H1i.hu
 
picengraver Dátum/Date: Szerda, 2012-09-19, 22:06 | Üzenet/Post # 28
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Tweakie,

Good job. I'm looking forward to the next installment on your neat development. I am running some crude (so far) testing this week with wood coatings/sealers. Tung oil looks promising, but more testing needed.

An email on its way to you later tonight.

My Best,
John


I paint with a blue light beam.
 
tweakie Dátum/Date: Péntek, 2012-09-21, 15:34 | Üzenet/Post # 29
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Thanks John.

My new CO2 laser tube has just arrived from China, been plumbed in and the water circulation system run for some 2 hours (to remove all the air bubbles) now to test it out.

Tweakie.

Csatolások/Attachments: 6411905.jpg(46Kb)


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tweakie Dátum/Date: Szombat, 2012-09-22, 11:18 | Üzenet/Post # 30
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Quote
Do not remove the display, it's so cool!
Your proto sems like my final work, my protos are made in spaghetti-design.
Waiting for further results.


Thanks Amator,

This all started out as spagetti - just thought I should tidy it up a bit with a pcb before taking any photo's biggrin

I don't think a display would serve any useful purpose in the finished design but, as you say, it does look cool.

Tweakie.


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tweakie Dátum/Date: Kedd, 2012-10-02, 17:41 | Üzenet/Post # 31
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As well as experimenting with the step / direction controlled PWM generator (previously mentioned) I am also re-visiting the Mach3 Impact / Laser plugin and making a few 'try it and see what happens' changes to increase the pulse width and scale the output pulse density per pixel. Initial tests look promising but there is still more to be done to get it right.

Just as a comparison to other techniques this image was created with the laser on Obechi with a 0.2mm stepover and a feed-rate of 3000mm/min.

Tweakie.

Csatolások/Attachments: 1047221.jpg(64Kb)


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picengraver Dátum/Date: Kedd, 2012-10-02, 18:37 | Üzenet/Post # 32
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Tweakie,
Well, it looks like you got it dialed in pretty good to me.

Regards,
John


I paint with a blue light beam.
 
Amatőr Dátum/Date: Szerda, 2012-10-03, 20:31 | Üzenet/Post # 33
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tweakie, that is really awesome! The contrast is so fine, the whole picture look very sharp. Keep going!

H1i.hu
 
tweakie Dátum/Date: Vasárnap, 2012-10-07, 12:34 | Üzenet/Post # 34
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Thanks guys.

I have now made a small change to the Mach3 Impact / Laser Engraving plugin and this is detailed here http://hobbycncart.com/forum/66-160-9386-16-1349455266

Not many people have managed to get this plugin to work for them but hopefully the latest version may perform better. dry

Tweakie.


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Amatőr Dátum/Date: Hétfő, 2012-10-08, 17:01 | Üzenet/Post # 35
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tweakie, I saved for further use, if I would be so lucky to own a CO laser. Anyway I think You did just a great work! Thank You!

H1i.hu
 
tweakie Dátum/Date: Hétfő, 2012-10-08, 17:14 | Üzenet/Post # 36
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Hi Amator,

Thank you for the compliment, it is much appreciated.

The plugin can also be used with an impact magnet although I have not tried the updated version to see if it makes any difference but there are others who are trying it so I will find out what they think in due course.

Tweakie.


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tweakie Dátum/Date: Kedd, 2012-10-09, 11:41 | Üzenet/Post # 37
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A close up of Super Kitty. biggrin

Tweakie.

Csatolások/Attachments: 7528098.jpg(72Kb)


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picengraver Dátum/Date: Kedd, 2012-10-09, 14:59 | Üzenet/Post # 38
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Tweakie,
I'm turning green with envy. Great job.
John


I paint with a blue light beam.
 
tweakie Dátum/Date: Kedd, 2012-10-09, 15:06 | Üzenet/Post # 39
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Thanks John.
Does that mean that we may have a CO2 tube on the shopping list ?? biggrin

Tweakie.


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Viktor Dátum/Date: Kedd, 2012-10-09, 16:20 | Üzenet/Post # 40
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tweakie, Woow.Perfect.
 
Fórum » Only in English » Technologies » CO2 Lasers. (Anything relating to CO2 Lasers can be discussed here.)
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