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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > My shamelessly cheap $12 DIY stir plate
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Old 04-09-2013, 05:00 PM   #161
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How do you do that? If I am just using the magnet and fan I can't identify the center point because of the shape. I tried with the stir bar on the magnet but there is a little play in where the stir bar will stick so that doesn't seem reliable enough.
Real easy. Put the fan on a table surface and turn it on. If it skitters and moves itself across the table surface, the magnets are off center and need to be adjusted. Just keep moving them little by little until you find a sweetspot (centerpoint). It'll take you a couple of tries, but once you feel comfortable mix up that JB Weld and lock them in place. Believe me, if the magnets are close to being centered, the stirbar will fall inline and not misbehave (as much )


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Old 04-09-2013, 05:23 PM   #162
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Just wanted to pass it along, it may have been mentioned already though. I got this fan from NewEgg for $14.99 shipped, I didnt need anything else off Amazon so I did not qualify for the shipping, plus they are based out of my state so I have to pay sales tax with them as well.


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Old 04-10-2013, 02:34 PM   #163
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Real easy. Put the fan on a table surface and turn it on. If it skitters and moves itself across the table surface, the magnets are off center and need to be adjusted. Just keep moving them little by little until you find a sweetspot (centerpoint). It'll take you a couple of tries, but once you feel comfortable mix up that JB Weld and lock them in place. Believe me, if the magnets are close to being centered, the stirbar will fall inline and not misbehave (as much )
My fan does budge but my stir bar still gets tossed. Does that mean I need a bigger stir bar?
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Old 04-10-2013, 02:52 PM   #164
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My fan does budge but my stir bar still gets tossed. Does that mean I need a bigger stir bar?
Does budge or doesn't budge? Because if it does budge that means the magnets are off center and the small 1" stirbar will get thrown all the time. I have a stirplate that is rock solid centered and I can get a ripple in my 2L flask even with the 1" stirbar, but I use a 2" stirbar for big starters and the 1" is for starters 750mLs and under.
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Old 04-10-2013, 09:39 PM   #165
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Does budge or doesn't budge? Because if it does budge that means the magnets are off center and the small 1" stirbar will get thrown all the time. I have a stirplate that is rock solid centered and I can get a ripple in my 2L flask even with the 1" stirbar, but I use a 2" stirbar for big starters and the 1" is for starters 750mLs and under.
Sorry does not budge.
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Old 04-10-2013, 10:44 PM   #166
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Sorry does not budge.
I had to put a little more distance between the stir bar and the magnets. Right now, it's a Post It notepad
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Old 04-11-2013, 02:56 AM   #167
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Do I want the cyclone of water to touch my stir bar and send up all those bubbles? I can get it to do the cyclone but as soon a it touches the stir bar it gets tossed. Do I just need a bigger magnet?
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Old 04-11-2013, 01:23 PM   #168
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Do I want the cyclone of water to touch my stir bar and send up all those bubbles? I can get it to do the cyclone but as soon a it touches the stir bar it gets tossed. Do I just need a bigger magnet?
No, the cyclone is an area of turbulence. I would fully expect that your stirbar would get tossed once the cyclone touches it regardless of the size of either the stirbar or the magnets. Reduce your speed. Also once you actually start doing starters in there, your cyclone will be less pronounced due to the higher viscosity and density of a sugar/water/yeast solution. In this case, there is a measurable quantity that tells you it's a denser liquid that brewers are directly interested in: Gravity is a measure of density.
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Old 04-11-2013, 01:48 PM   #169
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I built my own stir plate, it didn't work. The first power supply I used wasn't powerful enough to spin the fan when the stir bar was present. On my second attempt, the stir bar would get tossed off immediately. I just gave up and bought a ready-made one from stirstarters.com (not spamming, check my post count - just giving a personal account). It's worked great for my 1" stir bar and 2L flask. I haven't yet tried it with my 2" stir bar and 5L flask, but that'll get to be tested when I finally make my Doppelbock later this summer.
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Old 04-13-2013, 04:13 PM   #170
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We made one using the fan and a couple rare earth magnets. We glued the washer to the fan and never even had to glue the magnets down. Initially we did it for placement, but it worked so well we never messed with it. Then we mounted it into a little project box. Couldn't be happier with it!


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