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DIY Magnetic Stirrer / Stir Plate & Bars

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#21 Phungivore


    ɹǝuoɟ ƃuıʞɔnʇs

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Posted 12 May 2006 - 02:09 AM

on this project i learned 1 thing fans do not make good motors if you want it to work like a factory made stirrer. i think i made one pefect for mycology but if you actually wanted it to be like the factory made unit you would prolly want a motor with some tork. once i can find either some gears or pullys to mount on my RC motor i will make a better setup then the fan. any one know of a good source for gears , pullies , and maybe small motors. will have to see if i still got thr RC motor

#22 hogwild



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Posted 12 May 2006 - 03:46 AM

Just built mine today. Its quite basic but gets the job done of course

Small 20mm fan
12volt auto bulb
6 volt transformer
Small Throwaway gladware type container (circular)
platform of some sort(wood, plastic, anything you want to mount it on)
Jb qwik 2 part epoxy
Stainless Steel Hole cover
Electrical tape

Basically the fan was mounted to a platform, in this case it was wood. Instead of using screws to mount it, JB weld was used. A washer was attatched with JB weld in the center of the fan(be sure to center the washer first, and take your time, its well worth it)
The bar magnet was then centered on the washer and JB weld in place. I was too lazy to go buy a rehostat so instead i used a 12 volt auto bulb wired in with the fan.
This bulb serves a dual purpose, it heats up the lc just a tad and also limits the voltage even more so the fan spins at just the right speed.
The bulb was coated with a decent amount of jb weld so that most of hte light is blocked out.
Once you wire your single pole switch in with your bulb and fan you can mount them to the platform using more JB weld or screws if you wish.

Instead of using plexiglass or some other type of platform, i decided to use a circular pp5 rated ziploc container flipped upside down. I cut the sides of the container down to where the top was just about half a centimeter from the spinning magnet.
Jb weld the ziploc thing in place and your stirrer is complete. Like i said.. very basic

Will post pics tomorrow.

#23 Hippie3



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Posted 12 May 2006 - 08:17 AM

any one know of a good source for gears , pullies , and maybe small motors

electric timer
tape recorders

#24 Spark



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Posted 13 May 2006 - 05:15 PM

Magnetic sitrrer vid

The video was recorded by anno.

[Direct Link]

#25 Killjoy



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Posted 15 June 2006 - 08:22 PM

Finally convinced the FOAF to get a picture the Plates I made for him in action...
Just thought I'd share.
As for stir bars
Ceramic Magnets Coated in Rubber rubbed off and chipped,
Various nails in tubbing didn't spin.
Ceramic Magnets in Rubber tubbing work great... Just need to trim the clamped ends properly or they Fly out of control.
only other advice...
test the stir bars before you toss them in. My Foaf has a dozen small LC's with stir bars that don't stir. Time to shake shake shake. and make a few more Ceramic magnet ones.

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#26 BuckarooBanzai


    The Abe Vigoda of Mycotopia

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Posted 15 June 2006 - 08:28 PM

Nice vortex on that closeup. Excellent design.

That naked wire makes me kind of nervous...

#27 Hippie3



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Posted 15 June 2006 - 08:33 PM

you wanna live forever ??

thx for sharing , killjoy

#28 Killjoy



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Posted 15 June 2006 - 09:23 PM

Ground wire?
We don't need no stinking ground wire!

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