[sudo-discuss] giant laser for the robot

[Adam Munich]

So it's not 1064

Knowing the wavelength is important so you can get lenses with the
proper anti reflective coating. With un coated lenses, 8% reflection
at 100W is a fuck ton of scatter.

You dont need very high powers to see 808nm. What I would do is shine
it into sandblasted glass, so the light is diffuse and safer to look
at.

And yeah an air compressor is very needed.



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On Thu, May 19, 2016 at 1:29 PM, Jake <jake at spaz.org> wrote:
> well i'm not looking at it that's for sure.  but it's just diodes so does
> that mean it's either 808 or 975?  how to tell the difference?
>
> what does it mean as far as what can it cut?
>
> and what lens do we use to get greater depth of field?  I worry that the
> focus angle is too steep as it is right now (i'll check with smoke and an
> infrared camera inside a light-tight box) to be able to cut through thick
> materials.
>
> and do we need a jet of air to blast stuff out of the way while cutting? we
> have an air compressor now.
>
>
> On Thu, 19 May 2016, Adam Munich wrote:
>
>> Dark cherry red = 808nm
>> Invisible, laser has glass rod = 1064nm
>> Invisible, laser is just diodes = 975nm
>>
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>>
>> On Thu, May 19, 2016 at 1:17 PM, Jake <jake at spaz.org> wrote:
>>>
>>> i can't tell by looking at the beam.
>>>
>>> how do you find out such a thing?  we need some sort of spectrometer
>>> since
>>> it's bright enough to be detected through almost any filter.
>>>
>>>
>>> On Thu, 19 May 2016, Adam Munich wrote:
>>>
>>>> 1064nm, 808nm or 975nm?
>>>>
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>>>>
>>>> On Thu, May 19, 2016 at 12:55 PM, Jake <jake at spaz.org> wrote:
>>>>>
>>>>>
>>>>> i was planning to just make an opaque, hinged privacy temporary-wall
>>>>> for
>>>>> when the robot is doing something dirty like that.  It will help with
>>>>> ventilation too, which is a bigger problem than arc flash with the
>>>>> plasma
>>>>> cutter.
>>>>>
>>>>> but a plasma cutter is such an awesome tool, i think it's totally worth
>>>>> the
>>>>> annoyance of having to make it safe for puny humans.
>>>>>
>>>>> -jake
>>>>>
>>>>>
>>>>> On Thu, 19 May 2016, Adam Munich wrote:
>>>>>
>>>>>> You wont find an NIR blocking plastic curtain, unless it's black
>>>>>> vinyl.
>>>>>>
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>>>>>> Weblog: http://adammunich.com
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>>>>>>
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>>>>>>
>>>>>>
>>>>>> On Wed, May 18, 2016 at 11:41 PM, Patrik D'haeseleer
>>>>>> <patrikd at gmail.com>
>>>>>> wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Cool! Do you have a model number on there somewhere?
>>>>>>>
>>>>>>> I assume this will be an IR laser if it's a diode array. So if we get
>>>>>>> a
>>>>>>> safety curtain, we'll need one that can block both UV from the plasma
>>>>>>> cutter, and IR from the laser. Ditto for safety goggles. I assume
>>>>>>> that's
>>>>>>> feasible, although likely a little harder than protecting against
>>>>>>> just
>>>>>>> one
>>>>>>> of those.
>>>>>>>
>>>>>>> Patrik
>>>>>>>
>>>>>>> On Wed, May 11, 2016 at 1:58 PM, Jake <jake at spaz.org> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> I forgot to include this link:
>>>>>>>>
>>>>>>>> http://www.idacontrol.com/articles.php?nid=10
>>>>>>>>
>>>>>>>> and a picture of the laser:
>>>>>>>>
>>>>>>>> http://i.imgur.com/eXwf7Lo.jpg
>>>>>>>>
>>>>>>>> I looked it up and to put out 75 watts of laser power, we should
>>>>>>>> probably
>>>>>>>> feed in about 187 watts, or 2.5 times as much DC power in.  That
>>>>>>>> means
>>>>>>>> we
>>>>>>>> need 112 watts of cooling with the liquid path.
>>>>>>>>
>>>>>>>> we can put sonar sensors on the front of the laser so we can
>>>>>>>> pre-focus
>>>>>>>> it
>>>>>>>> by distance while preparing works to be cut.
>>>>>>>>
>>>>>>>> -jake
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, 11 May 2016, Jake wrote:
>>>>>>>>
>>>>>>>>> we got a giant laser for the robot.  This will allow it to cut
>>>>>>>>> things
>>>>>>>>> precisely for us, even if they're really large.
>>>>>>>>>
>>>>>>>>> of course to do this we'll have a safety interlock to prevent use
>>>>>>>>> by
>>>>>>>>> untrained people, and we'll have a safety curtain or folding wall
>>>>>>>>> to
>>>>>>>>> deploy
>>>>>>>>> around the robot while the laser is enabled, so nobody can
>>>>>>>>> accidentally
>>>>>>>>> see
>>>>>>>>> the light coming from it.
>>>>>>>>>
>>>>>>>>> I don't know the wavelength of the laser, but it's a giant laser
>>>>>>>>> diode
>>>>>>>>> array with a lens on the end, and it has a water cooling jacket,
>>>>>>>>> and
>>>>>>>>> i
>>>>>>>>> think
>>>>>>>>> i was told it's a 75 watt laser.  we do have a way to power it.
>>>>>>>>>
>>>>>>>>> if anyone wants to get involved with playing with this, please let
>>>>>>>>> me
>>>>>>>>> know. I think we could get it to the point where it could cut
>>>>>>>>> through
>>>>>>>>> some
>>>>>>>>> serious stuff, and the extremely large work area of the robot is a
>>>>>>>>> big
>>>>>>>>> deal.
>>>>>>>>>
>>>>>>>>> -jake
>>>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
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>>
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