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Old 05-20-2010, 08:13 PM #1
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Default Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

We have like 600 Front surface mirrors, Anyone interested in handfulls like for use in combining reds or general projector internal beam stearing mirrors?

Thinking like 4 euros each + whatever shipping and packging would cost.
minimum 10 units as they are tiny and not worth the packaging.

Also

Will have some defraction gratings with rotors aswell like 100 units, gratings are mounted inside a rotating shaft so you just need to add them direct into a multi colour beam up-to 7mm OD and connect 5V to the geared motor. Mounting is extreamly simple.

Will be including two gratings with each motor with instructions how to make some cool effects using both gratings.

Thinking like
25 euros each for up to 10 sets
20 euros each for up to 20 sets
15 euros each for up to 30 sets

http://www.lasershows.ro/gratings/Picture%20001.jpg

http://www.lasershows.ro/gratings/Picture%20005.jpg

http://www.lasershows.ro/gratings/Picture.jpg

http://www.lasershows.ro/gratings/IMG_6493.jpg

The gratings are good quality Glass, not thin cheap plastic.


Answers for Tech_Junkie


Full rotation is ~9 seconds at 5V, can be slower with some small transistor; likely can be faster too with a small voltage increase.

Grating effect are grids of dots for the first grating then when combined with the second grating its thousands of dots all moving is around like a pair of expensive Machado star gratings.

It’s good enough that we used these in our lasers with small actuators to introduce the first beam then the second grating on the end of a solenoid to give different effects.

A video is here: http://www.youtube.com/watch?v=zxgsxxyOXqY at 4:04 10 seconds of it sadly you can't see the grating effect so great due the other beams that got in the way. Information on the show, it is the day of the Man in Romania which also corresponds to a beer festival where there are live music followed by a short firework and lasers show. The music is By one of he best known Romanian bands call Iris.

Also with both gratings in the beam, varying the 5V also produces variation of effects, I am thinking to put a small DMX to RC servo receiver to do this control. This way would require 3 dmx channels, on/off motor speed and second grating on/off. doing it this way is a bit more complex but for simple hobby applications a direct 5V to the motor would be ok. Maybe somebody can suggest a small speed control for the DC motor and little Solenoids to active the beam and second grating.



Last edited by andyf97; 05-21-2010 at 08:04 AM.
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Old 05-20-2010, 09:58 PM #2
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Default Re: Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

What's the RPM of the motors?
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Old 05-20-2010, 10:12 PM #3
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Default Re: Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

Do you have more details on the diffraction gratings?
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Old 05-20-2010, 10:14 PM #4
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Default Re: Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

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Originally Posted by potatorage View Post
Do you have more details on the diffraction gratings?
That too. How many lines, ect?
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Old 05-22-2010, 08:13 AM #5
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Default Re: Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

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Originally Posted by andyf97 View Post
Full rotation is ~9 seconds at 5V, can be slower with some small transistor; likely can be faster too with a small voltage increase.
That's around 6rpm, and way to fast. It should be a maximum of 2rpm or less to get a proper star effect. Also that motor may stop working if you drop the voltage to far. Servos will work but you have to gear them down, and remove the "stop" on the last gear in the housing.
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Old 05-22-2010, 10:53 AM #6
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Default Re: Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

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Originally Posted by Tech_Junkie View Post
That's around 6rpm, and way to fast. It should be a maximum of 2rpm or less to get a proper star effect. Also that motor may stop working if you drop the voltage to far. Servos will work but you have to gear them down, and remove the "stop" on the last gear in the housing.
We have a small circuit that can slow them almost to zero, the gearing drops the speed down hugely. At 5v the motor is racing along.

I will get some videos at various speeds soon as i can, right now am very busy on a project.
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Old 05-23-2010, 02:33 AM #7
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Default Re: Front surface mirrors 7mm x 8mm x 2mm & Defraction gratings with geared 5V rotors

Also remember that this has a nice entry to the center of rotation. When the beam is dead center, it would be almost as though nothing is moving at all (of course the beam isn't a single point though, so some will be moving - but the closer to the center, the slower the gratings move)
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