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Old 04-17-2012, 06:39 AM   #1
mjmac85
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Default Magnets for stir plate

Are these good enough
http://www.ebay.com/itm/4-Neodymium-disc-3-8-inch-X-1-8-rare-earth-magnet-/300696762414?pt=LH_DefaultDomain_0&hash=item4602ec 782e#ht_500wt_844

or these

http://www.ebay.com/itm/1-Neodymium-Magnets-1-x-1-4-x1-16-Rare-Earth-Block-Gold-/160632651227?pt=LH_DefaultDomain_0&hash=item256673 bddb#ht_1661wt_827

Also was thinking of going with a 7/8" stir bar. I will probably be using a 1000ml flask and/or a growler for my container.

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Old 04-17-2012, 01:49 PM   #2
BigB
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I used the round type, but I purchased them from Ace Hardware. They work good. I would be cautious about using a growler as your vessel because the bottom isn't usually flat, which would make it difficult to balance your stir bar.

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Old 04-17-2012, 01:59 PM   #3
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Quote:
Originally Posted by BigB View Post
I used the round type, but I purchased them from Ace Hardware. They work good. I would be cautious about using a growler as your vessel because the bottom isn't usually flat, which would make it difficult to balance your stir bar.
Just made one last night. I agree that a flask would work better, but it can be done with a growler. The key for me was to get the magnet balanced in the center of the growler when you start it up, as long as I did that it worked pretty well!
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Old 04-17-2012, 11:00 PM   #4
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I bought .25"x.25" square rare earth magnets and they seem to work fine. The 3/8" discs should be great. You just want to make sure you get the polarity right before you secure them. Make sure one is North and the other is South.

The bar magnets are great if they are magnetized through the length. The one you listed appears to be magnetized through the thickness. That means that one 1"x1/4" surface is North and the opposite is South. This is bad for a stir plate. You would want a bar that is magnetized through the length so one end is North and the other is South. If you don't, then you will probably throw your stir bar.

A great alternative is the magnet from an old or broken computer hard drive. You will need a Torx bit screwdriver, but those magnets are strong and magnetized along the proper axis.

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Old 04-18-2012, 02:34 AM   #5
mjmac85
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Bought a 25mm stirbar with ring for $6 and 4 magnets for under $5. Prices include shipping. Just need to go to radio shack to get speed control. Don't think I will end up with an on off switch since I can always just unplug it.

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