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Old 05-07-2010, 06:56 AM #1
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Default polygon mirror from laser printer

i just tore apart a laser printer and ripped out all the cool optics, i was hoping for a beam combiner of sum sort but it at least had the polygon mirror inside it. i isolated the -+ leads but cant get the thing to rotate. anyone have any idea what the problem is, im thinking not enough voltage.
-nick


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Old 05-07-2010, 07:52 AM #2
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Default Re: polygon mirror from laser printer

Its a bipolar stepper motor. The pins are used for each coil in the motor, depending on the poles of the stepper motor will determine the wires you will connect to the power input. The rest of the wires are for motor feed back and other factors that do not need to be worried about.

A bipolar stepper motor looks like this....



You typically find that, if you find the + and - of one pole, it will rotate 90 degrees, then stop. This is normal... try and find the next coil. (I suggest using a low voltage and amperage input, just till you work out the poles and polarity).

These motors are great to use in a liquid sky effect, that I explain in this thread

Need some help finding a laser for effect...

Have fun, tell us how it goes!! -Adrian
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Old 05-07-2010, 09:11 AM #3
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Default Re: polygon mirror from laser printer

the board i have has only 4 wires and only wires lets just call them 1a and 1b show conductivity. i put a 3v cr2 to it and nothing happens, not even a 90 degree turn.
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Old 05-07-2010, 01:07 PM #4
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Default Re: polygon mirror from laser printer

Just to make sure.... We are talking about this motor right...



If so, try using a small phone charger with voltage at ~12v and current <0.5A and see if that will get it spinning... just be sure you don't burn out the motor.
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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

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

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

Check out my How to Build a Selectable Dummy Load Thread!
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Old 05-07-2010, 05:08 PM #5
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Default Re: polygon mirror from laser printer

Found a LDO 5V reg w/ on/off in mine. More than just optics in stuff ;-)
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Old 05-08-2010, 01:32 AM #6
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Default Re: polygon mirror from laser printer

its not that specific model but it is a bipolar stepper motor. i tried feeding it 10v but nothing. ive determined which leads are which with the diode setting on my dmm.
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473nm bw tek lab 10mw
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650nm rifle 250mw
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