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Old 09-18-2009, 02:39 PM #1
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Default Rear surface mirror any good?

Im putting together a spiro and only have a sheet of acrylic rear surface mirror, the shaft of my motors is only 1mm.

Do you think it will still be ok or will the shaft showing mess my beam/image up?

Jason


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Old 09-18-2009, 02:48 PM #2
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Default Re: Rear surface mirror any good?

I think mainly the fact that your mirror is not front surface, is where your reflection distortion will come from. There are some cheap, suitable mirrors at dark lasers.

Front Surface Mirrors : Dark Lasers, The one-stop shop for all your DIY laser needs!

I'm not too sure about what you mean about your shaft though..

But I hope this helps!

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Old 09-18-2009, 02:52 PM #3
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Default Re: Rear surface mirror any good?

OK, I thought my problem would come from the shaft being visible from the front.
Didnt think about the reflections...derr!

Ile give them a try as I have them and get some FS mirrors as well.

Cheers
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Old 09-18-2009, 03:08 PM #4
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Default Re: Rear surface mirror any good?

Rear surface mirrors will give you a "shadow" projection. You will get one reflection off of the rear, mirrored surface and one weaker reflection off of the front surface of the glass. As you can imagine, this is NOT a good idea if you want the projection to be "clean."

Peace,
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Old 09-19-2009, 11:56 AM #5
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Default Re: Rear surface mirror any good?

Indeed, reflectivity of back silvered mirrors isnt really a big problem for an application like this, but you will get a sort of double-image projection. Same thing that produces 2 dots when you shine a pointer at a (bathroom) mirror. Somtimes the light also bounces a couple of times between the mirror and front surface, producing a row of dots - depends on the angle and thickness of the glass.
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Old 09-19-2009, 12:06 PM #6
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Default Re: Rear surface mirror any good?

Quote:
Originally Posted by Meatball View Post
I'm not too sure about what you mean about your shaft though..

But I hope this helps!
LMFAO that what she said!! sorry couldn't resist!
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Old 09-19-2009, 09:14 PM #7
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Default Re: Rear surface mirror any good?

As stated, use first surface mirrors. I've heard of some people removing the coating on the rear of a mirror and finding a good FS mirror.
Also --- Keep the mirror as light (massless) as possible. They can move faster and with less overshoot.

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Old 09-19-2009, 10:01 PM #8
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Default Re: Rear surface mirror any good?

What your saying has jogged my memory Mike, cant remember where it was but I too have read about removing the first coat on the back of a mirror...ile experiment with some 'substances'

I wont have to look at any shafts eh Bobhaha!
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Old 09-20-2009, 01:44 AM #9
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Default Re: Rear surface mirror any good?

lol hopefully not!
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Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

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Jetlasers wrap around 190-540nm OD4+ goggles*
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Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

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