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Old 12-25-2011, 05:14 AM   #11
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Sounds like a polarity issue to me too. I'd try getting a second magnet and attach them to a large fender washer, then attach the washer to the fan. Double-check your polarity before putting it all back together to make sure the stir bar hooks up and centers itself on the axis and is not repelled at either end.

Here's a pic of mine if it helps. The magnets have a slight curve to them so one is attached to the washer with the curve up, and the other with the curve down.
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Old 12-25-2011, 05:15 AM   #12
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Another vote for polarity

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Old 12-25-2011, 05:16 AM   #13
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Wow, yet another reason to hate my lhbs. I looked into buying a stirplate a couple of weeks ago. They wanted $120. I built one for $6.00.

I bought A, ONE, SINGLE stir bar for $6.25.
Care to share the stir bar you built?
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Old 12-25-2011, 05:59 AM   #14
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Quote:
Originally Posted by microbusbrewery
Sounds like a polarity issue to me too. I'd try getting a second magnet and attach them to a large fender washer, then attach the washer to the fan. Double-check your polarity before putting it all back together to make sure the stir bar hooks up and centers itself on the axis and is not repelled at either end.

Here's a pic of mine if it helps. The magnets have a slight curve to them so one is attached to the washer with the curve up, and the other with the curve down.
<img src="http://cdn.homebrewtalk.com/attachment.php?attachmentid=41531"/>
It has to be like this. Two separate magnets in the stir plate. I tried with one long bar magnet with the same results as you. I snapped it in half, and mounted with proper polarities and it worked great.
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Old 12-25-2011, 03:35 PM   #15
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the magnet you are using is polarized top to bottom rather than end to end. The stir bar is polarized end to end ( I cant recall the terms for this) .. Basically the surface of the magnet that is facing you and towards the stir bar is eaither N or S .. the stir bar on the other hand has one END that is N and the other S. That is why one end of your bar is attracted and the other repelled. Get a different magnet, or 2 seperate ones..or break the one you have in half.

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Old 12-28-2011, 02:04 AM   #16
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Originally Posted by nukinfuts29 View Post
Care to share the stir bar you built?
The stir plate?

I need to get pics of it but mostly, I used parts I had on hand.

I took a generic power supply that I bought years ago, the kind that you can use for a multitude of different devices (variable voltage, polarity and a bunch of different connectors, it was the only one I had on hand that would do 12 dc volts, and wired it to a 80mm PC case fan that I bought from Microcenter ($.99) and then wired a 25-ohm, 3 position rheostat, from Radioshack, into it ($3.95) in as well. I mounted the fan into a desktop mesh bowl that I used to keep loose change in and glued a hard drive magnet to it.

I need to pick up a flask but, as 'proof of concept', I took a plastic measuring cup, put a couple cups of water in it and dropped in the stir bar. I let it run for a couple of days to see if it would burn out and it seemed to work okay!
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Old 12-28-2011, 10:20 AM   #17
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First time I read through here I thought you said stir bar, which peaked my curiosity big time lol.

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Old 12-28-2011, 01:49 PM   #18
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I built a stir plate using 1 hard drive magnet. Any stir bar I use over 3/4" will stand up on end when the plate is running. The 3/4" stir bar will stand up at high speed. A 5/8" stir bar doesn't do this and a 1/2" stir bar works the best on my stir plate.

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Old 12-28-2011, 04:01 PM   #19
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all good info to keep in mind. didn't have a prob when i made mine with a hard drive magnet but I don't think my stir bar is bigger then .5".

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