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Fórum » Only in English » Technologies » CO2 Lasers. (Anything relating to CO2 Lasers can be discussed here.)
CO2 Lasers.
Amatőr Dátum/Date: Szerda, 2015-02-04, 17:50 | Üzenet/Post # 461
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I've tried to write really small letters on plywood, but I wasn't succesfull. It is something like a cut-off under 3mA, the beam does nothing, over it the beam is too wide and the letters are unreadable. Maybe the wood is too light.

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tweakie Dátum/Date: Csütörtök, 2015-02-05, 06:37 | Üzenet/Post # 462
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Hi Zoltan,

Plywood is perhaps not the best material to experiment with as the edges of the letters may have additional charring thus making them unreadable. A laser engraving laminate (or something similar) may be better.

This test was done some time back to check the resolution possible with my laser when fusing printer toner onto copper clad pcb board. The 1mm characters are fine but the 1/2mm characters are starting to get unreadable so 1mm characters are definitely possible.

Tweakie.

Csatolások/Attachments: 7008162.jpg(51Kb)


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Amatőr Dátum/Date: Csütörtök, 2015-02-05, 09:13 | Üzenet/Post # 463
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tweakie, really fine results!
Can You remember the power and speed You used?


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tweakie Dátum/Date: Csütörtök, 2015-02-05, 09:27 | Üzenet/Post # 464
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Hi Zoltan,

Sorry I can't remember exactly (it was a long time ago now) but it was raster scanned and would have been very low power and speed around 300 to 1000mm/min (to give the toner time to melt and fuse to the surface).

Tweakie.


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Amatőr Dátum/Date: Péntek, 2015-02-06, 18:23 | Üzenet/Post # 465
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tweakie, I will try again,maybe I can make thinner line by setting the material's surface more exactly into focus.
I'm making a mirror engraving again, and I have a new problem. I have a test pattern, before making picture, I set the power to it, and my experience is when it is techically fine and every pixel is clearly visible then the picture is tinge, does not look good. The white is not white, just gray, and the whole image is poor. The good looking picture needs more power, but now i have an image with continuous white areas, and the glass becomes cracked. Yeah, new challenges smile


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tweakie Dátum/Date: Szombat, 2015-02-07, 06:39 | Üzenet/Post # 466
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Hi Zoltan,

I know the problem well.  smile It just takes lots of practice / experimentation to get all the settings just right.

Tweakie.


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Amatőr Dátum/Date: Szombat, 2015-02-07, 09:42 | Üzenet/Post # 467
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tweakie, so it's a known problem smile
Finally I had to replace the whire areas with gray, the mirror survived the process.
Is it a solution to use thicker mirror?


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tweakie Dátum/Date: Szombat, 2015-02-07, 11:40 | Üzenet/Post # 468
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I'm not sure if thicker glass would help - it would certainly dissipate more heat so may be less likely to crack but I would try a slightly faster feed-rate to see if that helps.

I have not experimented with mirrors much (I am leaving it all to the expert - Zoltan) but I did this, as a test, getting on for two years ago where I engraved the black areas then painted the back black after it was complete.

Tweakie.

Csatolások/Attachments: 3616987.jpg(60Kb)


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Amatőr Dátum/Date: Hétfő, 2015-02-09, 16:43 | Üzenet/Post # 469
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tweakie, this engraving has higher resolution than the ones I made. Nice outcome.
The best ting I can do now is to work with darker images, and avoid large white areas on photos.

Today this little guy arrived, can make 2,5Bar pressure, and enough blow on a 3mm hole:

All I had to do is to make a small filter box to the inlet:


At the weekend I was trying to write letters on plywood again, this time ca. 5mm high.
The results is fine, but every letter shows the firing point:

I think that is because of the acceleration of the machine. Is there any software what can make a movement before firing? I mean the axis should accelerate to the desired speed and firing the laser on fly. Of course the software must know the direction of every line to come from the right direction. I really don't know laser softwares, maybe it exist.
Csatolások/Attachments: 8371311.jpg(214Kb) · 6005787.jpg(175Kb) · 4646380.jpg(236Kb)


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tweakie Dátum/Date: Hétfő, 2015-02-09, 17:03 | Üzenet/Post # 470
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Hi Zoltan,

Are you using the M11/M10 commands for switching the laser ??

btw. Very nice compressor.  ok

Tweakie.


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Amatőr Dátum/Date: Hétfő, 2015-02-09, 17:07 | Üzenet/Post # 471
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tweakie, yes, that is the fastest way to fire.

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tweakie Dátum/Date: Hétfő, 2015-02-09, 17:38 | Üzenet/Post # 472
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Hi Zoltan,

The dots just at the start of a line are something I have not seen before (when M11/M10 is used). If it was all down to Acceleration then I would expect to see a dot at the end of the line also as (as far as time is concerned) Acceleration = Deceleration in Mach3.

I will check out a few settings in the morning and see if I can replicate your results.

Tweakie.


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Amatőr Dátum/Date: Hétfő, 2015-02-09, 18:00 | Üzenet/Post # 473
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tweakie, You are right! If the point was caused by the acceleration, then there should be at the end too because of the deceleration.
Here is a sample from the gcode, maybe You see something in it:


Would it be better to take the M11P1 command in the same line where the x-y movements are?


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tweakie Dátum/Date: Kedd, 2015-02-10, 07:54 | Üzenet/Post # 474
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Hi Zoltan,

Running your code snippet 'as is', on my machine, produced rounded corners (indicating that the feed-rate was too fast for my acceleration settings) and a 'dot' at the start and end of each line.

Modifying your code to reduce the feed-rate to 800 and removing the Z axis moves produced near perfect results.

I don't think it matters but my preference is to always have the M10/M11 codes on their own line.

Tweakie.

  
Csatolások/Attachments: 3197513.jpg(43Kb) · 4950916.jpg(46Kb)


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Amatőr Dátum/Date: Kedd, 2015-02-10, 09:18 | Üzenet/Post # 475
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tweakie, thank You for helping Me!
This high feedrate comes from DotG settings, I try to give a short firing time. It is just a bad habit, seems not Ok for vector works.
Afternoon I will try again.


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Amatőr Dátum/Date: Kedd, 2015-02-10, 17:01 | Üzenet/Post # 476
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After modifying the feedrate and removing the Z movements the result is dot free.



Thanks for advice!
Csatolások/Attachments: 0946281.jpg(344Kb)


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tweakie Dátum/Date: Szerda, 2015-02-11, 06:28 | Üzenet/Post # 477
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Hi Zoltan,
Excellent, I am pleased you have been able to resolve the problem.  ok

Tweakie.


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tweakie Dátum/Date: Szerda, 2015-02-11, 08:38 | Üzenet/Post # 478
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Hi Zoltan,

Just another thought...

A small Gcode program could be written (similar to this post http://hobbycncart.com/forum/63-151-5261-16-1326704648) which will allow you to find the exact focal point of the laser beam (smallest dot size).
Once found measure the distance between the lens assembly and the work surface or make a small setting gauge of this dimension for future use.

Tweakie.


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Amatőr Dátum/Date: Csütörtök, 2015-02-12, 16:46 | Üzenet/Post # 479
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tweakie, on the Chinese machine there is no Z axis, it is fixed. I have just an imaginyary Z in the gcode.
(it is not easy to place items with various thickness under the beam)
Anyway the idea is good, I will use a cant surface to find the correct focal lenght of my lens.


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tweakie Dátum/Date: Csütörtök, 2015-02-12, 17:09 | Üzenet/Post # 480
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Idézet
tweakie, on the Chinese machine there is no Z axis, it is fixed. I have just an imaginyary Z in the gcode. 

Ahh ! - I forgot about that.  wacko

Tweakie.


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