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Old 12-28-2016, 02:23 AM #625
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Default Re: NUBM44 6W+ 450nm Laser Diode

Yeah, the problem is that is just the wrong diode for that purpose. You be better off with an NDB7875. It gives you three watts with a G lens, costs $45.00 and has a much better beam profile. Drive it at 2.4 amps and with good focus, you should see a marked improvement. Other than that, IDK.


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Old 12-28-2016, 02:42 PM #626
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Default Re: NUBM44 6W+ 450nm Laser Diode

Quote:
Originally Posted by Bx3mE View Post
Hi! i hope i am in the right place...
I have some time ago bought a NUBM44 6W Diode for using in my CNC for cutting stuff. Lack of better knowledge made me choose this diode so now i will have to make the best of it.
To counter the bad beam characteristics I have tried playing with some lenses but i suck at this so please help me
I bought a set of correction lenses (win or loose) on e-bay in hope of being able to improve my cnc cutting reslults.

My biggest problem beam shape all my cuts look like they have been done with a caligraphy pen - The cut is Wide in one direction and thin in the other.
Second problem contrast - The focused spot is blurry. I have 2 times the power i need in the center of the spot but no matter how I Experiment with Focal length Power and speed the cut does not get sharp edges... It is like using a blowtorch to cut paper...
Any help would be appreciated...
Feedback I get say best setup is a very short FL lens like a G-2 and no more than 30mm from the aperture to the work with good ventilation. For an idea of ability of this diode see the video in this post and you can ask in this thread for better help.
https://www.photonlexicon.com/forums...361#post326361

If you want finer engraving you can get more detail as you go down in power. NDB7A75, NDB7875, PLTB450B and then BDR-209.

Last edited by DTR; 12-28-2016 at 02:43 PM.
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Old 12-30-2016, 10:17 PM #627
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Default Re: NUBM44 6W+ 450nm Laser Diode

Quote:
Originally Posted by DTR View Post
Feedback I get say best setup is a very short FL lens like a G-2 and no more than 30mm from the aperture to the work with good ventilation. For an idea of ability of this diode see the video in this post and you can ask in this thread for better help.
https://www.photonlexicon.com/forums...361#post326361

If you want finer engraving you can get more detail as you go down in power. NDB7A75, NDB7875, PLTB450B and then BDR-209.
Thnks! I am learning and currently im cutting 3mm chipboard at 80% power 1000mm/min with 10 passes. Biggest issue i have had is getting my head around that diode casing is same as Driver Ground (negative) which causes my entire machine to randomly stop communication with the PC - Classic misstake...
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