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Some "serious" laser-marking with a fiber-laser ...

Posted by VDX 
VDX
Some "serious" laser-marking with a fiber-laser ...
December 16, 2018 06:37AM
... was on an "Advent market" exhibition last week -- and did some "Christmas-deko" with engraved and cut brass sheets:




The "boot" was two tables, where I've placed the marking laser ... and on the other table some other samples (3D-printing, CNC-milling/engraving, others ...):







But one of the visitors wanted some "personal" laser-marking (others will eventually contact me the next days for their "personal" items):



Here the video engraving the part - [vimeo.com]

Edited 1 time(s). Last edit at 12/16/2018 06:38AM by VDX.


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
December 29, 2018 04:54AM
... tested to cut the "MeArm-robot" files ( [create.arduino.cc] ) from 0,4mm brass instead of 3mm acrylic:

[vimeo.com]


Now to find some time to assemble it ... and maybe even more time to find some micro-motors to move the arm(s) cool smiley







Edited 1 time(s). Last edit at 12/29/2018 04:57AM by VDX.


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
January 03, 2019 05:30PM
That looks awesome! Great to show off a machine like that.
What power laser did you use in those examples?
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
January 03, 2019 05:44PM
... this was a pulsed 20W-fiber-laser cool smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
January 05, 2019 04:14AM
Quote
VDX
and maybe even more time to find some micro-motors to move the arm(s)

I saw some very small geared motors ( 6mm motor diameter with planetary gears )...maybe still to big?

VDX
Re: Some "serious" laser-marking with a fiber-laser ...
January 05, 2019 05:38AM
... yes, still too big eye rolling smiley

But no problem - this "MeArm"-robot is not meant for productive use (have other piezo-driven XYZ/pan/tilt-stages for this), but more as show-sample -- will assemble it in a fixed pose grinning smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
February 23, 2019 02:35PM
... one of my sisters designed a series of "witch's houses" winking smiley






Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 05, 2019 03:58PM
... for Easter my middle sister has thought about some "Easter egg" designs - she wants them in brass, but I also thought about distributing them as "silhouettes" in black cardboard on white postcards to some of our shops in town - in cardboard it is much faster (and cheaper) to cut, so that they can give it away as a gift:




Here a videoclip showing the "cutting" of one of the motives - [vimeo.com]


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 13, 2019 02:07PM
... and the same in brass:




Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 14, 2019 12:41PM
... here two videos, showing the "lasercutting" (more multi-pass engraving) of the "rabbit-egg" - first in black cardboard:

[vimeo.com]


- and the same file in brass:

[vimeo.com]


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
April 14, 2019 01:10PM
I wonder what power you use to cut through brass, and is it a Co2 laser ?
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 14, 2019 01:26PM
... read some posts back - this is all made with a 20Watt fiber-laser.

There is maybe some difference with my setup - most (if not all) low power fiber-lasers and controlling software prohibit slower PWM frequenzies than 30kHz for risk of damaging the resonator.

My fiber-laser has an internal option to reduce the internal power in respect t frequency, if lower than 50kHz.

For "cutting" brass or cardboard I'm reducing the PWM to 2kHz and thus reduced power, it can "cut" through 0,1mm brass with one pass! at slower scanning/moving speeds.

For cutting through the used 0,2mm brass, I have to repeat 3 times - but then the "cut" is so fine, that it's hard to separate the smaller parts ... so I'm repeating 6 times.

With cardboard the PWM frequency is the same, but the scanning/moving speed can be much faster. - Here I'm reducing the power and engrave too with multi passes to prevent excess burning of the material ...


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
April 14, 2019 04:51PM
In that case, I guess you could cut through thicker brass, say 1mm, just that you'd need many more passes ?

or would the focus point and/or beam shape prevent cutting through thicker material ?

What frequency is the laser (Co2, ultra violet etc) ?

Edited 1 time(s). Last edit at 04/14/2019 04:56PM by Pippy.
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 14, 2019 06:02PM
... the fiber-laser has 1064nm (NIR=Near InfraRed) -- the deeper, the finer the new cut, so not so deep per cut as the previous ones - it's sort of limited by something like a millimeter in metal, if cutting the same line ... could be different, if cutting parallel lines with some ten microns distance to "open" the cut ... but then I'll better use a more powerfull laser cool smiley

Until now I've cut brass sheets with up to 0,4mm and steel with 0,5mm thickness with the 20 Watts ...


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
April 14, 2019 07:07PM
That's a nice and extremely useful tool you have smiling smiley
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 02:27AM
... thanks!

Actually building/developing around 976nm-diodes with 200 Watts of power on a spot of 0.2mm - lower energy-density than the fiber-lasers, but the sheer power should be enough to cut through 1mm steel with one pass cool smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 04:10AM
200 Watts is a LOT of power!

Where do you get your lasers I wonder ?

I'm not sure if even a 20 Watt laser diode would get past customs in the UK, don't really know.
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 06:03AM
... I'm salvaging 9Watt- and [email protected] NIR-laserdiodes from broken fiberlasers - there are several of them used for "pumping" the energy for the fiber-laser.

The bigger diodes with 808nm or the [email protected] are from ebay-sellers, which salvage multi-kW-lasers -- you can see some of the diodes in this post:

[photonlexicon.com]


But caution, the thread with the "through-shot" tile and damaged PS-display was my April joke for this year cool smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 06:34AM
Would be fascinated to see some detailed photos of the guiding mechanics (the micro motors ?), see how you've done it.
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 06:59AM
... have no plans to "motorize" the Mini-MeArm-robot ... but if, then with piezo-drives, I have from some older microtech-developments.

Here two types, I've found in the shelf (have some other types more for "nano-positioning") - the more expensive (400€) linear "Piezo-Motor" and the much cheaper (60USD) american "oszillating" drives (a sort of "piezo-go-cart" in the background) - they are meant for micro-steps in the range of hundred nanometers "dynamic", or with sub-nanometer accuracy whne "clamped":






Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 09:53AM
Good god, 200 euros for a little piezo motor lol. A bit out of my price range.

I've used lasers in my designs for ranging and Mbit data linking, but have yet to venture into the high power (high for me) cutting world, which I'd really like too.

Those ones you have look expensive Viktor.

What's the metal box I wonder ? .. is that the laser, or maybe the piezo driver(s) ?
VDX
Re: Some "serious" laser-marking with a fiber-laser ...
April 15, 2019 04:38PM
... the "metal box" with the 3 piezo-wedges is only the "heavy mass" to press the ceramic tips of the piezo-oszillators on a surface, so they'll have enough friction for the "dynamic" stick'n'slip motion mode - this was only an experiment to show some possibilities ... the later positioners were made with the "piezo-leg" linear drives and much better controllable (23mm travel length, 150 nanometer per "step", sub-nanometer when clamped) ...

Edited 1 time(s). Last edit at 04/15/2019 04:39PM by VDX.


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
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