old computer fan...

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old computer fan...

Post  Whatever on Thu Jan 28, 2010 6:38 pm

I'm looking to make a couple stir plates...anyone got an extra left-over computer fan laying around?

Maybe we could work out a trade for an ounce of hops. I have warrior, cascade, centennial and czech saaz...and nugget leaf.
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Re: old computer fan...

Post  keith on Sun Feb 07, 2010 3:53 pm

you tell me what you need we can work out a deal i build computers in my spare time
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Re: old computer fan...

Post  Whatever on Fri Feb 12, 2010 1:17 am

Here is a basic parts list for the diy stir plate build...you can do a web search for it and several sites with walk-throughs come up.

Computer fan
Neodymium magnet
Reclaimed Power pack (6v-12v)
screws
spacers
rheostat/potentiometer (radio shack)
magnetic ptfe laboratory stir-bar (ebay)
Glass flat bottom vessel
wiring shrink wrap/electrical tape
solder or wiring caps
cigar box/gladware container

As far as fans go, every diy site I've seen online uses 12 volt 3.5" fans (80mm), but I don't see why a slightly smaller (or larger) fan wouldn't work, but I won't know for sure until I try. Two, three or four wire fans should work. Graphics card fans will probably not be strong enough to spin the extra weight/resistance.

Suitable fans have the spinning centers exposed on one side for the magnets to be mounted on. Older fans with the removable metal guards are preferable, because I think can the metal guards can be incorporated into the design so as to eliminate the need for a cigar box entirely.
We will need dead hard drives for the magnets.

I think old cell phone power packs will work, so long as they are at least 5 or 6 volts, but no more than 12v of course.

The rheostats/potentiometers can be had at radio shack, but there are computer fan specific speed controllers on eBay for less than $4 shipped. I will probably try buying one from ebay just for simplicity's sake. A fan with a plug may plug right in, thus minimizing wiring.

The stir bars are about $5 on ebay, more or less. Unless someone in our club has a "supply" of them. wink wink.

You may be able to buy a real laboratory stir-plate on ebay for $20-30 plus shipping.

I prefer to try and make one for less, and use the savings to pay for grain, hops, etc.

And I like the challenge of trying to do more with less.

In fact, I sometimes feel that because I have become so proficient at doing more with less, that I can do almost anything with practically nothing. Besides, I have been bored ever since I mastered the art of doing nothing with everything.

-Ben
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Re: old computer fan...

Post  keith on Sat Feb 13, 2010 9:42 am

you going to be at the march meeting ill bring ya a 80mm fan
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of course...unless life rears its head

Post  Whatever on Mon Feb 15, 2010 2:43 pm

I'll be there. I'm usually at the table in the Southwest corner of the room.
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Re: old computer fan...

Post  keith on Tue Feb 16, 2010 6:40 pm

sounds great
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Re: old computer fan...

Post  bpear on Tue Feb 16, 2010 10:01 pm

Are we talking about magnetism, if so tell me how fast you want your yeast to churn. Ben G.
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stir bar

Post  Scott_M_Bort on Thu Feb 25, 2010 1:12 am

Anyone know a good local source for stir bars? I'm putting one together soon and don't want to order off amazon or drive the hour out to American Scientific/Surplus if i can get it round these parts.
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Re: old computer fan...

Post  Whatever on Thu Feb 25, 2010 3:09 pm

I bought a pack of 5 one inch oval shaped stir bars off ebay. If you're interested I'll sell you one for what it cost me...$5.

I bought multiples with the intention of building a few plates and selling them on ebay...if you must know.

Then I could buy me a $5 foot long.
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Re: old computer fan...

Post  Scott_M_Bort on Thu Feb 25, 2010 3:28 pm

drop me a email at [You must be registered and logged in to see this link.]
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Re: old computer fan...

Post  finess on Wed Mar 03, 2010 6:18 pm

Guys, I made one and I'll bring it to the next meeting for "Show and Tell"

I bought my stir bars on Ebay real cheap!!!
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