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spiro motors

neutrino

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What min and max speeds would you guys recommend for making a three mirror spiro unit. I'm trying to select some motors but am unsure of the speeds.

Cheers
Rich
 

Meatball

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I would think that the commonly available speeds of 6000-7000 rpm would be just fine. I'm building one two.. so I'm hunting around as well. The ones from radioshack are generally pretty fast... but you don't want them too fast to control.
 

Meatball

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Do you use them with he offset weights? Or do you
somehow remove them?
 

neutrino

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so if you pull the weights off how do you then mount the mirror onto the tiny shaft? Do you know what the diameter of the shaft is?

Thanks again
Rich
 

HIMNL9

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If you have glass mirrors, a simple disk of thick plastic can help ..... just do the hole in the center of the disk, with the desired inclination, glue the disk on the pin and the mirror on the disk.

If instead you use the acrylic mirrors, you can do the hole directly on the non-mirrored face of the acrylic (paying attention to not go out from the other surface and not deformate it), then glue it directly on the pin.

just remember, more the assembly is centered and without vibrations, and more stable are the figures ;)
 

neutrino

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I was thinking of finding some old gears and using them as the discs.
Can these just be run through a pot or should I build a circuit for better control. What about reversing the motors as well?
 

jaycey

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The shaft on the pager motors are 1mm, you dont have to have round mirrors and the advantage of using square mirrors is that its alot easier finding the centre of a square than it is a circle!

Dont get too hung up on centre position as you have to have a little 'wobble' to create patterns.

To create different patterns/beams you have to vary the speed of the motors, so a pot is highly recomended. and depending on what volyage you are feeding the mirrors you will need to slow them down as at high speeds they will vibrate themselves into peices.

To reverse the motors you must have DPDT (double pole double throw) Switches.

Have a look here at my latest build for some ideas... http://laserpointerforums.com/f49/have-i-stumbled-onto-something-new-46758.html
 

HIMNL9

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Gears are ok too :)

Reversing the direction in continuous mode, requires a double battery ..... for the better regulation, instead, a simple voltage regulator (also just one made with an LM317) is the better solution, and a double deviator (DPDT) switch can be used for reverse the direction.


Edit: jaycey beatened me in speed ;) :D
 




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