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Author Topic: Lasers - general chat.  (Read 9896 times)
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tweakie
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« on: October 04, 2014, 02:32:38 AM »

Hi Guys,

Kirk said :-
“I see a lot of different wavelengt h lasers, from DVD blue to infrared.  What's recommend ed for cutting gasket paper, along with being able to make grey scale Celtic knots and general fooling around?”

As we know, different wavelengt hs have different effects on different materials so it is impossibl e to say what is best for general purpose use but, from a safety aspect, my personal preferenc e would be infrared although most use blue (ex-blue ray player).

Last year I cut some gaskets from the G320 stuff using my CO2 laser (http://www.cooperman.talktalk.net/files/27_files/image974.jpg) and they came out well but some other gasket materials I have here would not laser cut at all (it all depends on the gasket material compositi on).

Dan said :-
“I could not find anything bad about flexmod p3 I think I might go with it will I need to add that other thing you suggested also will it work with arts controlle r with out many problems”

The FlexMod has both analogue and TTL inputs and works in either mode so yes it should work just fine with Art’s controlle r.

“And what would be a good set up for a test driver/load I am a complete newbie when it comes to electroni cs”

I am not sure what others do but I used 3 of the high power Luxeon LED’s all connected in parallel with a multi-meter (set to Amps) connected in line with the bank of LED’s.
Just be conservat ive with setting the current – we have probably all destroyed more than one laser diode by being too greedy.

Finally a word of warning – safety goggles, with an OD rating at the wavelengt h of the laser being used, must be worn at all times the laser is in use or is capable of being brought into use. Children, bystander s, pets, etc must always be kept well clear of the work area and suitably protected from possible laser beam reflectio ns.

Tweakie.
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DanL
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« Reply #1 on: October 04, 2014, 05:06:06 AM »

Thanks for that Tweakie yes glasses is a must I burnt my eyes with a reflectio n from my laser scanner, I wear the glass all the time even when the door is shut on it. and by god it hurt I still see spots when I close my eyes.
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tweakie
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« Reply #2 on: October 04, 2014, 05:53:57 AM »

Good example of the dangers associate d with lasers Dan.

It is always best to learn from other’s mistakes rather than make the mistakes ourselves but I still remember getting ‘Arc-Eye’ as a kid from watching bro. doing some electric welding – I was warned what might happen, took no notice and suffered the consequen ces for a couple of days. No surprise, it has never happen since.  Wink

Just a note regarding a theoretic al worst case scenario when not using the appropria te eye protectio n...

Stray reflectio ns from an Infrared laser can cause burns / tiny blisters on the surface of the Cornea. A very painful experienc e and a bit like Arc-Eye but it is, for the most part, self healing. On the other hand, stray reflectio ns from a visible laser can pass through the Cornea and are then focused by the Lens onto the Retina where any damage produced will almost certainly be permanent .

Sorry to waffle on so much about safety but it is paramount .

Tweakie.
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DanL
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« Reply #3 on: October 04, 2014, 04:32:09 PM »

say that about ir laser Tweakie would it be better to get an ir laser for the reason that it a little bit safer.

it`s probable it wont be a problem for me using 445 laser as I am going to make a cover for the laser anyway in case one of my kids comes in to my shed.

I will draw up what I am going to make this and post it
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Mooselake
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« Reply #4 on: October 05, 2014, 07:10:07 PM »

Thanks, Tweakie!

I was leaning towards around a 2W IR laser, but I'll probably keep talking about one rather than getting it for a while - too many projects in the works until the snow gets too deep to work on the outside ones.  It'd be a nice addition to my QUBD RPM, if/when I get the missing parts to complete it, since it already has side panels.

Kirk
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DanL
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« Reply #5 on: October 05, 2014, 11:46:45 PM »

guys what would be better a 445nm 1400mw laser or a 808nm 2000mw laser as I can get both for the same prices they both have TTL controlle rs with them and I have seen the 445nm working if a 808nm would be better than a 445 I would get one with what Tweakie said about them it sounds a safer laser to use sort off
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tweakie
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« Reply #6 on: October 06, 2014, 01:13:55 AM »

guys what would be better a 445nm 1400mw laser or a 808nm 2000mw laser as I can get both for the same prices they both have TTL controlle rs with them and I have seen the 445nm working if a 808nm would be better than a 445 I would get one with what Tweakie said about them it sounds a safer laser to use sort off

Hi Dan,

I have absolutel y no idea and I think that only you can decide which will be best for your applicati on.

These are not mine just recent work by others as an example…

Analogue laser engraving using 455nm on birch ply by Jeff  http://kiskz.ucoz.hu/_fr/2/0424911.jpg
TTL laser engraving using 808nm on glass mirror by Dave http://kiskz.ucoz.hu/_fr/2/7431100.jpg

Tweakie.
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DanL
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« Reply #7 on: October 06, 2014, 02:11:53 AM »

thanks Tweakie
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Mooselake
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« Reply #8 on: October 07, 2014, 11:29:10 AM »

I have absolutel y no idea and I think that only you can decide which will be best for your applicati on.

If your applicati on is general screwing around^^^^^^^^^^^^^^^^^^^^^^^self education then IR is somewhat safer and a better first attempt?  Most of my gasket paper is dark colored so either blue or IR has a good chance of working - or the auto parts store will have something else that might.

Kirk
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DanL
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« Reply #9 on: October 07, 2014, 01:40:45 PM »

art how do I add images to a post
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BobL
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« Reply #10 on: October 07, 2014, 02:43:46 PM »

DanL;

 When you hit reply, click on " additiona l informati on" bottom left.. There you may add images..

Cheers
Bob

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Gearotic Motion
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DanL
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« Reply #11 on: October 07, 2014, 05:05:36 PM »

Thanks bob

This is how I think I will make the head and heat sink for my laser


* top down.jpg (28.51 KB, 500x240 - viewed 587 times.)

* bottom up.jpg (36.81 KB, 402x436 - viewed 518 times.)

* frount.jpg (19.1 KB, 500x378 - viewed 523 times.)
« Last Edit: October 07, 2014, 05:48:28 PM by DanL » Logged
Mooselake
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« Reply #12 on: August 07, 2015, 01:22:12 PM »

After hemming and hawing (or perhaps we could call it deep introspec tive thinking and reviewing ...) I just ordered one of those (claimed) 40W Chinese K40 Lasers from eBay, for not a lot more than the 2W solid state diode version I'd been looking at earlier.  It's supposed to ship out of Californi a, so maybe in a week or so I'll see just how good a decision that was.

Kirk
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DanL
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« Reply #13 on: August 07, 2015, 11:58:14 PM »

good luck with that at lest you know if the controlle r is bad there is a good replaceme nt
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Mooselake
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« Reply #14 on: August 08, 2015, 07:04:20 AM »

Yes, many choices for replaceme nt controlle rs, from laserized Marlin on an arduino to smoothieb oards to Mach3/4, with a lot of stops in-between.  From comments in the K40 G+ group and elsewhere even the Moshidraw controlle r and software might be getting better and be good enough for a while.  Remains to be seen, until then it's a project in a blue box.

First it has to get here without a lot of glass fragments rattling in the box.

Kirk
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