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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > DIY stir plate question
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Old 06-10-2011, 02:18 AM   #1
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Default DIY stir plate question

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, 02:35 AM   #2
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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, 02:55 AM   #3
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That ring also helps in keeping the noise down

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Old 06-10-2011, 03:58 AM   #4
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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, 06:00 AM   #5
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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, 01:28 PM   #6
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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, 01:52 PM   #7
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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, 06:04 PM   #8
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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, 07:48 PM   #9
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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, 08:20 PM   #10
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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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