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Old 06-10-2011, 01:18 AM   #1
kbuzz
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Jan 2011
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If I find something to encase it in, does anyone see anything wrong with using the second rare earth magnet from a hard drive as the stir bar?

Was thinking I could encase it in a food grade plastic or something...

Thoughts?
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Old 06-10-2011, 01:35 AM   #2
Chrisl77
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I got my stir bar off ebay for under $10 including shipping. All the hard drive magnets i have seen are very wide and have a curve in them. I dont think they would make a good stir bar even encased in food grade plastic. Most of the ones on ebay also have a pivot ring to reduce friction.
http://cgi.ebay.com/New-1-inch-PTFE-...#ht_2290wt_817

 
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Old 06-10-2011, 01:55 AM   #3
zepolmot
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That ring also helps in keeping the noise down

 
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Old 06-10-2011, 02:58 AM   #4
adam01
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Stir bar - $3.75 + 2 (shipping) = ~6 bucks

Erlenmeyer flask - ~$20

Cost of second Erlenmeyer flask - $20
+ $1000 for the pain of your wife calling you cheap...


See ebay + fisher stir bar

 
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Old 06-10-2011, 05:00 AM   #5
BrewBeemer
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Quote:
Originally Posted by adam01 View Post
Stir bar - $3.75 + 2 (shipping) = ~6 bucks

Erlenmeyer flask - ~$20

Cost of second Erlenmeyer flask - $20
+ $1000 for the pain of your wife calling you cheap...
Wife at times a pain in the AZZ about your hobby brewing costs, PRICELESS!
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Old 06-10-2011, 12:28 PM   #6
Hang Glider
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Quote:
Originally Posted by kbuzz View Post
If I find something to encase it in, does anyone see anything wrong with using the second rare earth magnet from a hard drive as the stir bar?

Was thinking I could encase it in a food grade plastic or something...

Thoughts?
even encased in something, I don't think you'll get a spin - I think the two will "lock" on each other through the glass - preventing the motor from spinning, unless the motor torque finally takes over and throws the magnet.

Those things are just too strong. Stir Bars - are they magnets themselves, or just rods of steel, reacting to the spinning magnets on the motor?

 
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Old 06-10-2011, 12:52 PM   #7
lowlife
 
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They are magnetic. At least mine are. I have several of them and they all stick together.

 
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Old 06-10-2011, 05:04 PM   #8
JoeyChopps
 
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Mines not magnetic I think they all come non magnetic but after lots of time around a magnet field they become magnetic......at least I think that's how we made a compass in boy scouts

 
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Old 06-10-2011, 06:48 PM   #9
Hang Glider
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So, perhaps encasing a 16d nail (cut to length inside of plastic tubing, silicone the ends, o-ring around the center - might make you a stirbar, Kbuzz

 
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Old 06-10-2011, 07:20 PM   #10
Catt22
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Magnetic Stir bars have a magnet embedded inside the Teflon covering. The stir bars can be damaged by overheating or sometimes by subjecting them to a strong shock (as in dropping one on a hard floor). Ideally, the magnetic stir bars should be stored in pairs stuck together magnetically to preserve their strength.

 
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