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Old 07-17-2012, 05:08 PM   #1
janitorjerm
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Default Rare earth magnet question

Are these a good size and strength for my stir plate or are they too much or too little? I did a search on the magnet but didn't find anything. All help appreciated.

http://www.magnet4less.com/product_i...oducts_id=1114
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Old 07-17-2012, 05:21 PM   #2
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I picked up 10 5mm Dia x 3mm thick Rare Earth magnets from these guys http://stores.ebay.com/bluestone002 on ebay.

I just installed them on my DIY stirplate and they worked well with my 1" stir bar when placed directly on top of the stir plate. I dont have a flat bottom glass container to test it out with.

I probably have 1/8" (3mm) gap between my magnets and bottom side of my cigar box. The cigar box top is probably 1/8"
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Old 07-17-2012, 05:24 PM   #3
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Is a 1" stir bar the "norm"?
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Old 07-17-2012, 05:50 PM   #4
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I used a hard drive magnet, I think if your using two of them you should be okay. I also use a 1" stir bar and a few of the containers i use don't have flat bottomes but the stir bar stays in place. I even used a 1 gal jug a couple times and the 1" stir bar worked fine.
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Old 07-17-2012, 06:24 PM   #5
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If I could find a hard drive that would have been first choice but it seems like when you need something you can't remember where you put it. I was going to use two or three of these magnets instead.
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Old 07-17-2012, 06:27 PM   #6
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a few others have said they doubled up on the magnets and it worked great so you shouldn't have any issues.
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Old 07-17-2012, 06:31 PM   #7
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So should I get them thicker or stack them
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Old 07-17-2012, 06:37 PM   #8
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The ones in the link should work well in a flat bottomed flask.

I put a pair of these on a fan and the magnetic field is crazy, 1-5/8" stirbar always self-centers in a with a curved bottom gallon jug.

http://www.grainger.com/Grainger/Dis...AF2?Pid=search
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Old 07-17-2012, 06:59 PM   #9
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I just ordered similar ones in 7/16 from a different site. They may be magnets4less but they are shipping for more. They tacked five bucks on my order for being less than five dollars and the minimum shipping they offered was ten dollars. Seems a bit steep to me .
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Old 07-17-2012, 07:04 PM   #10
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Here is what I went with.

https://www.kjmagnetics.com/proddetail.asp?prod=D72-N52
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