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Old 02-21-2011, 01:18 AM   #1
scsi
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Default Help with DIY Stirplate

Hey all —

I've been trying to build a stirplate... I've the electrical taken care of... I'm trying to use hard drive magnets on a run of the mill computer fan.

I've seen the forums about using a washer, which I've done. I can't seem to get this thing aligned correctly.

I turn the fan on slowly (it needs more juice to get started, but I back down the speed right away). I slowly speed the fan up, but before I can get any sort of stirring action, the stir bar flings off.

I've tried getting closer to the fan, but the fan then sticks to the bottom of the flask...

Here are some pictures. The magnets in this shot are one of several dozen orientations. Then, these are the two stir bars I'm using, from Austin Homebrew. One is 1", the other is 2".







Any thoughts?

Cheers!



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Old 02-21-2011, 02:33 AM   #2
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I tried all sorts of thing with mine, I had the most success with just one hard drive magnet centered on the fan and a very small stir bar



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Old 02-21-2011, 02:38 AM   #3
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I've tried one magnet on the washer, and again without the washer... Still no dice.

My smaller stir bar is 1" but it's not round. It's got a flat top and bottom. I wonder if I should find one of the football shaped ones?

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Old 02-21-2011, 02:50 AM   #4
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If the speed of the fan is too great, the stir bar will get thrown. You don't need much speed to stir effectively. In fact, you don't even really need a vortex.

Also, convex bottoms on glass jugs and jars will throw the bar with some systems.

The distance between the stir bar and your hard drive magnet(s) is also important. Not knowing what you're using, it's hard to say what's going on. Good luck with it.

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Old 02-21-2011, 03:24 AM   #5
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I had the same issue, I ended up placing my magnets end to end in a line. One facing up and the other down. I then placed my flask with 2" stir bar over it to make sure the bar stays centered on the magnets and not just over one or the other. If this does happen then just flip the magnets around and check your stir bar allignment over the magnets again. Eventually you will turn them the right way. the ends of my magnets do not touch, they are about 1/4" apart. Good luck on your build.

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Old 02-21-2011, 03:25 AM   #6
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I'm trying to picture your set up. I glued a metal coin size punchout piece to the center of my fan. then I used a hard drive magnet on top of that. You can then move the magnet around to different positions until you find one that works. Can you play around with the position of the magnet?

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Old 02-21-2011, 03:42 AM   #7
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I cut out a 2.5" circle out of scrap MDF wood I have. I have 6 button magnets purchased from Ace Hardware for less than $6. I will use 2 magnets per each side of the circle and countersink them.

magnets are STRONG as F uck... I should definitely be able to spin a stir bar using this method.

-=Jason=-

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Old 02-21-2011, 03:46 AM   #8
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My fix was very simple. I moved it from the counter top to the carpet. It stoped throwing it then.

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Old 02-21-2011, 04:01 AM   #9
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I would suggest experimenting with different size stir bars. Take some steel nails and cut them down to different sizes to test out. I had to find the perfect size for my DIY stirplate, not too big and not too small. Once you find the right size get some small home depot plastic tubing and melt the ends with the nail inside it. Whalla, you have your own DIY stirbar.

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Old 02-21-2011, 04:05 AM   #10
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Quote:
Originally Posted by bovineblitz View Post
I tried all sorts of thing with mine, I had the most success with just one hard drive magnet centered on the fan and a very small stir bar
+1

Put the magnet(s) across the center of your washer and use the smallest stirbar. Place the flask with stirbar inside on top of your stirplate BEFORE turning it on. Switch it on...


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