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Fórum » Only in English » Technologies » Diode Lasers. (Using Diode Lasers with CNC Machines.)
Diode Lasers.
Dave Dátum/Date: Szombat, 2013-02-02, 04:43 | Üzenet/Post # 401
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Rebuild finally completed successfully. Just testing on orange cardstock so far, but it's real nice to see the picture clearly instead of all those bleeping lines. I have a lot of work to catch up with the rest of you folks! I think I want to re-do the X axis with a ballscrew as well, cuz once you've seen one ballscrew, ummmm, ummmm, you want to see the rest of them. surprised
Dave
 
tweakie Dátum/Date: Szombat, 2013-02-02, 07:37 | Üzenet/Post # 402
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Very neat mirror stand John. cool

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
tweakie Dátum/Date: Szombat, 2013-02-02, 12:14 | Üzenet/Post # 403
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Hi Guys,

Thank you for your suggestions relating to my laser control, they are much appreciated.
This is the big advantage of forums in general – the sharing of information always leads to new ideas and thoughts and I definitely need lots of new ideas and thoughts.

If I can explain in more detail, hopefully without sounding too negative, my laser PSU is a relatively basic designed device and although perfectly adequate for it’s intended purpose I am really trying to stretch it’s capabilities.

The potentiometer input is internally converted from analogue to digital with what I believe to be 10 bit precision. As I am only looking for a total adjustment of less than 2% this gave me a bandwidth of some 20 steps into which to fit the 256 greyscale steps so they were truncated and the final results were far too coarse and totally unacceptable.
Although it would be nice to obtain a PSU with 12 bit precision of the A to D conversion it is unlikely that the manufacturers would ever need to do this for a 40 Watt unit.

As mentioned earlier, my alternative is to pulse the trigger input (which then led to the PIC microprocessor) and this approach produces much more accurate translation of the 256 greyscale steps to output power levels and in turn enables reasonably acceptable results.
Like all things, there is still plenty of room for improvement but I only get a limited time to play with the laser (the machine is usually set-up for other work) so progress is slow.

I use the Parallel Port for the Mach3 / machine communication so it is pretty easy to tap into the parallel cable for my experiments thus avoiding any alterations or down time to the machine and this is a pic of the rig that I am currently using.

Tweakie.

Csatolások/Attachments: 2077486.jpg(157Kb)


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Kedd, 2013-02-05, 15:41 | Üzenet/Post # 404
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Tweakie,
Your workmanship and designs are so inspiring. I'm sure you'll also get this one to exceed expectations.

-----------------------------------------------------------------------------------------------------

It's been quiet here for a few days. I did this mirror yesterday. Still not up to Jeff's work, but getting closer smile

Subject is Captain Kangaroo (Robert James "Bob" Keeshan -June 27, 1927 – January 23, 2004), an old, beloved, children's favorite character on US TV from the 50s to the 80s (http://en.wikipedia.org/wiki/Captain_Kangaroo).

John

Csatolások/Attachments: 4885228.jpg(96Kb)


I paint with a blue light beam.
 
tweakie Dátum/Date: Kedd, 2013-02-05, 16:44 | Üzenet/Post # 405
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Wow, great work John. cool

Looks like I am really going to have to get myself some mirrors to try. biggrin

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
JJWMACHINECO Dátum/Date: Kedd, 2013-02-05, 16:51 | Üzenet/Post # 406
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Nice Nikon camera you got there John. biggrin biggrin

Your laser engraving came out fantastic also.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
picengraver Dátum/Date: Kedd, 2013-02-05, 23:36 | Üzenet/Post # 407
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Tweakie,
Thank you. Hurry up smile Can't wait to see your mirrors.
-------------------------
Jeff,
Thank you, too. Wife already has me busy making b'day gifts. OK by me since it will help justify a new machine soon wink

John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Kedd, 2013-02-05, 23:36
 
Dave Dátum/Date: Szerda, 2013-02-06, 16:33 | Üzenet/Post # 408
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Made this on birch ply for my better half's birthday.....
Also trying to do a mirror image, but I don't have that right yet. Laser burns through the paint and mirror coating, scrubbed it down and painted the back black, but the image just isn't that clear. Looks like it's going to take some experimenting to get it right.
Dave

Csatolások/Attachments: 1044804.jpg(76Kb)
 
tweakie Dátum/Date: Szerda, 2013-02-06, 17:09 | Üzenet/Post # 409
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Nice work Dave, she will be pleased with that. cool

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
Amatőr Dátum/Date: Szerda, 2013-02-06, 17:13 | Üzenet/Post # 410
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Hey Guys You made so nice things, I'm so impressed! What a fine works on mirror! Congratulations!

H1i.hu
 
picengraver Dátum/Date: Szerda, 2013-02-06, 18:23 | Üzenet/Post # 411
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Zoltan,
Thank you. When do you expect to get your machine back in operation? Soon, I hope.

Dave,

Beautiful work. Happy to see you back in operation.

I have stopped 'scrubbing' mirrors. Now I just wash off the burn residue with clear water and gently rub with my thumbs. Seems to work as well as scrubbing with soap.

Make sure you are using lithophane mode (non lithos seems not as good), and try at a reduced feed rate. Don't paint the back black if litho. Some mirrors seem easier to
burn than others. For some mirrors, I burn twice and this seems to improve contrast.

Also, I have just started spraying the back with clear lacquer for protection.

John


I paint with a blue light beam.
 
picengraver Dátum/Date: Szerda, 2013-02-06, 18:50 | Üzenet/Post # 412
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Just finished some of these. Dithered and litho mode.

John



Csatolások/Attachments: 6138760.jpg(53Kb) · 2978666.jpg(69Kb)


I paint with a blue light beam.
 
Dave Dátum/Date: Csütörtök, 2013-02-07, 03:17 | Üzenet/Post # 413
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Thanks for the kind words folks! I'm sort of 'half back', still have some minor problems with the x axis and want to convert that to a ballscrew as well if I can find some gold in the back yard biggrin
I'll try litho mode on the next mirror attempt John, the latest attempt pretty much incinerated the reflective coating so maybe I just ran it too hot. Mirror used had a light gray paint on the back, then a copper coating, then the aluminum reflective coat.
Dave
 
picengraver Dátum/Date: Csütörtök, 2013-02-07, 03:53 | Üzenet/Post # 414
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Dave,

You WANT the mirror coating to be removed in litho mode so the light shines through. In non-litho mode, you want the black paint to replace the reflective surface. So run hot. I'm using a measured 1.6 amps to my diode (ammeter is in line with the diode) at max, and .4 amps at minimum. I suggest you try a simple dithered image in litho mode for practicing. I've not seen any copper on the cheap mirrors Jeff and I are using, so perhaps you are using mirrors with a too high quality smile .

John


I paint with a blue light beam.
 
Dave Dátum/Date: Csütörtök, 2013-02-07, 04:23 | Üzenet/Post # 415
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Thanks John,
Guess I'll have to make a trip to the local dollar store. Mirrors I was testing with are just 1x6" strips from the local glass place that I used to use for making kaleidoscopes. I think the copper coat is a layer to protect the reflective layer, both got burned away.
Dave

Hozzáadva (2013-02-07, 04:23)
---------------------------------------------
fwiw, it turned out that the 4' ballscrew and nut I got from McMaster was actually less expensive than getting a precision acme leadscrew. Glad I went that way, the ballscrew is really great, there's almost no resistance in turning it.
Dave

 
tweakie Dátum/Date: Csütörtök, 2013-02-07, 17:44 | Üzenet/Post # 416
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I just love those praying hands John - excellent work my friend. cool

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Csütörtök, 2013-02-07, 21:44 | Üzenet/Post # 417
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Thank you, Tweakie.

My wife has me making a couple of dozen for gifts. Easy to do after the first one (always the hardest).

The mirrors are sold to display/hold candles. Pretty good quality for only $1.00 US each. smile

John


I paint with a blue light beam.
 
csewe Dátum/Date: Péntek, 2013-02-08, 19:14 | Üzenet/Post # 418
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Hi guys
I have read the topic.
There are a lot of good ideas.
Engem is nagyon érdekel a Tema.
In a few weeks, and completed the laser.
Then I experiment with grayscale images.
In the meantime, I look in your good work, and good ideas.
 
picengraver Dátum/Date: Szombat, 2013-02-09, 01:27 | Üzenet/Post # 419
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Welcome,

Please let us know if we can help you.

John Champlain


I paint with a blue light beam.
 
tweakie Dátum/Date: Szombat, 2013-02-09, 08:35 | Üzenet/Post # 420
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Hi csewe,

Welcome to the HobbyCncArt forum.

Much has been achieved, with diode lasers, during the last 12 months or so and it just keeps getting better and better thanks to the collective and pioneering work of our forum members.

Tweakie.


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