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Old 04-01-2008, 09:33 PM   #1
Seawolf
 
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Is there a fix for a stir plate that keeps throwing the stir bar? I can't get the bar centered, and it doesn't spin for more than 10 seconds or so.
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Old 04-01-2008, 09:36 PM   #2
s3n8
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Can you slow it down? That is the only way I can get mine to spin well, too fast and its off.

I also saw someone who had good luck with a + shaped stir bar.

 
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Old 04-01-2008, 09:44 PM   #3
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Do you keg?

Try placing a o-ring at the center of the bar as a pivot point. Works for me and I use the curved bottom 1 gallon jugs.

 
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Old 04-01-2008, 09:51 PM   #4
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Quote:
Originally Posted by GilaMinumBeer
Do you keg?

Try placing a o-ring at the center of the bar as a pivot point. Works for me and I use the curved bottom 1 gallon jugs.

Not a bad idea! It kind of seems like it doesn't even want to stay centered in over the stir plate though. The bar tends to favor 1 or the other magnet at rest. Is that normal for you guys?
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Old 04-01-2008, 09:53 PM   #5
conpewter
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Mine would throw all the time on my home built stirplate.

I had two hard drive magnets close together on the hub of the fan (differing poles facing up). I ended up putting a thin piece of pressed wood across the hub of the fan and gluing the magnets to the end of that so they were about 1" apart.

I've also heard that if you go down to having one magnet it can work as well.

 
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Old 04-01-2008, 10:04 PM   #6
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Quote:
Originally Posted by conpewter
Mine would throw all the time on my home built stirplate.

I had two hard drive magnets close together on the hub of the fan (differing poles facing up). I ended up putting a thin piece of pressed wood across the hub of the fan and gluing the magnets to the end of that so they were about 1" apart.

I've also heard that if you go down to having one magnet it can work as well.

Interesting..... I have two hard drive magnets, and the same polarity is facing up on both magnets. Are they supposed to be different?!?! I'm gonna get a smaller stir bar as the one I have is 2". If the smaller bar doesn't work, I can reverse polarity, or reduce to one magnet.
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Old 04-02-2008, 03:39 AM   #7
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Should be differing polarities facing up. If you take your stirbar and touch opposite ends to one pole of a magnet you will see that (normally) its just a bar magnet inside a plastic shell, so to get the maximum attraction between your bar magnet and two hard drive magnets you would want opposite poles facing up.

 
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Old 04-02-2008, 10:14 AM   #8
billyg
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Also, try a smaller stirbar. I switched to a smaller one AND one that did not have the ring in the center and have not had a problem.

And your magnets should be aligned so that both poles of the stirbar are matched with the poles of the RE Magnets....

 
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Old 04-02-2008, 11:35 AM   #9
s3n8
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I originally had 2 of the kidney shaped magnets from a hard drive on my fan. No matter what polarity NN/NS/SS and spacing or stacked, I could never get it to grab as well as if I only had 1 magnet.

I recently moved the fan a little closer to the bottom of the plexiglass, and now can pull a vortex in 1.5L of wort in a 2L flask with my 2" bar. I have 2mm spacing above my magnet to the plexiglass which the flask sits directly on. Moved it closer by 2mm, and it made a huge difference in stability at speed.

 
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Old 04-02-2008, 03:03 PM   #10
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Typically, a thrown bar is from trying to spin too fast. If you can't slow down the spin, then put some kind of spacer between the top of the stir plate and the flask. Plexiglass would be ideal, but you could use wood, cardboard, etc. Just experiment with materials and thicknesses until you get what you like.
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