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808nm 300mW laser

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samodezi

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Hello,

i've bought myself a laser diode:
Details about 808nm 300mW High Power Burning IR Laser Diode DIY Lab-in Laser Equipment Parts from Industry & Business on Aliexpress.com

I will use it to make a mini laser engraver, for wood and stuff. I don't have problems making the mechanics (x-axis, y-axis), but the only problem is that i'm new into lasers :p
I also ordered a laser housing and driver:
this:
Free Shipping 1PC New 5.6mm T018 16x50mm Industrial Laser Diode House Housing Case Lens-in Laser Equipment from Industry & Business on Aliexpress.com
and this:
APT Lighting 808nm 100 500mW Laser Diode/laser module/Laser Light Driver Constant current -in Laser Equipment Parts from Industry & Business on Aliexpress.com

But since i got some feedback, i was thinking the case won't be good enough for the laser, that the point of my laser won't be small enough. So i was wondering if there is any good solution, or what i have to aware of when i order a case?
Also, do you think a heatsink is necessary?

thanks in advance
 





Kalsongen

Kalsongen

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Apr 12, 2014
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samodezi said:
Hello,

i've bought myself a laser diode:
Details about 808nm 300mW High Power Burning IR Laser Diode DIY Lab-in Laser Equipment Parts from Industry & Business on Aliexpress.com

I will use it to make a mini laser engraver, for wood and stuff. I don't have problems making the mechanics (x-axis, y-axis), but the only problem is that i'm new into lasers :p
I also ordered a laser housing and driver:
this:
Free Shipping 1PC New 5.6mm T018 16x50mm Industrial Laser Diode House Housing Case Lens-in Laser Equipment from Industry & Business on Aliexpress.com
and this:
APT Lighting 808nm 100 500mW Laser Diode/laser module/Laser Light Driver Constant current -in Laser Equipment Parts from Industry & Business on Aliexpress.com

But since i got some feedback, i was thinking the case won't be good enough for the laser, that the point of my laser won't be small enough. So i was wondering if there is any good solution, or what i have to aware of when i order a case?
Also, do you think a heatsink is necessary?

thanks in advance
Click to expand...

Im a noob within lasers but i would suggest that you build youtube own driver.
I have a small CNC with a 1+ watt laser, i am using a 4x4x4(cm) aluminium cube for heatsink.

-Victor
 
Eudaimonium

Eudaimonium

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That driver looks like shite, also a ripoff.

You can easily build yourself your own fixed current driver, because if you ask me, screw that potentiometer nonsense, too many diodes lost because of that.

It's as easy as this:


Anyway, the dot of the laser is not a problem, the power is. For any engraving work, go with 1W blue. You can always tone down the power if needed (or speed up the plotter - save time).

300mW IR won't do good on wood. In fact you can't even burn your skin with it unless you sharpie it black first. The only thing it'll reliably burn out are retinas.
 
Kalsongen

Kalsongen

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Eudaimonium said:
That driver looks like shite, also a ripoff.

You can easily build yourself your own fixed current driver, because if you ask me, screw that potentiometer nonsense, too many diodes lost because of that.

It's as easy as this:


Anyway, the dot of the laser is not a problem, the power is. For any engraving work, go with 1W blue. You can always tone down the power if needed (or speed up the plotter - save time).

300mW IR won't do good on wood. In fact you can't even burn your skin with it unless you sharpie it black first. The only thing it'll reliably burn out are retinas.
Click to expand...


Dosent dark plastic react better to ir?

-Victor
 
Eudaimonium

Eudaimonium

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Kalsongen said:
Dosent dark plastic react better to ir?

-Victor
Click to expand...

Better to IR, as opposed to what?

If you mean, as opposed to rest of the spectrum, then no. Blue still wins for any given power level.

Besides, OP specified wood as one of the materials he wishes to engrave. Blue and violets will do the job perfectly, with blue being the better candidate because of easier diode availability, sturdiness - blue diodes can take much more abuse than violets, and higher powers being available if needed.
 
Kalsongen

Kalsongen

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Eudaimonium said:
Heh, both, I wanna see how did you assemble it all.
Click to expand...

Its ugly. My dad would sponsor me with NEMA 23 steppers + drivers to build a proper CNC if i got this one working. It was very cheap to build (exept for the laser) :)

The build was improvised, didnt follow any blueprint.

http://imgur.com/a/cHMVY

5x5cm Print area, not completly finished, the rubber bands are slipping sometimes, gotta replace them.

-Victor
 
Last edited:
Eudaimonium

Eudaimonium

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Looks pretty good, man, I was wondering what you're controlling it with, so it's an Arduino board?

So how do finally get what you want to engrave, on to the controller electronics? Do you first upload it to Arduino and just let it run, or is it connected to PC all the time somehow?
 
Kalsongen

Kalsongen

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Eudaimonium said:
Looks pretty good, man, I was wondering what you're controlling it with, so it's an Arduino board?

So how do finally get what you want to engrave, on to the controller electronics? Do you first upload it to Arduino and just let it run, or is it connected to PC all the time somehow?
Click to expand...

I have to upload it to the arduino, im going to use an old pc for the
Next build. Right now i have to type in the steps into a .ini file for it to work, so its kind of difficult to make complex things atm.

-Victor
 
The Lightning Stalker

The Lightning Stalker

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You could have the computer send simple commands to the Arduino over the serial port.

Pics are gone after only 2 days?

OP: 300mW will burn some types of wood, but not others, and even then only very slowly.
You need at least 1W to burn reliably, and don't forget safety glasses for viewing.
 
Last edited:
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