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Old 01-11-2013, 02:44 PM   #1
Aug 2012
Posts: 117
Liked 5 Times on 4 Posts

Im trying to build a stir plate for the first time. I have some 3.5" computer fans but they dont spin very fast.. i have magnets out of some old hard drives.

The container that i am trying to use is a 2000 mL storage kimble. its a very nice bottle the only downfall is that the bottom is convexed.. So the 1" lab stir bar i have wont stay on top of the hump and spin it just sits on the side.. how could i get this to work?

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Old 01-11-2013, 02:46 PM   #2
May 2012
Davie, FL
Posts: 107
Liked 6 Times on 4 Posts

The convex bottom is not gonna work. It needs to be as flat as possible. Its okay of your fan spins slow and the hard drive magnets are very popular

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Old 01-11-2013, 03:00 PM   #3
Hang Glider
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Mar 2007
North Augusta, SC
Posts: 3,218
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Strong magnets can also interfere with the motor itself - I've got my magnets suspended above the motor windings on a ring of aluminum (non-magnetic). I also had a Kimble Konte flask, it had a nice cork wrap near the neck, awesome - but the bottom wasn't flat enough. My Pyrex flask works fine.

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Old 01-11-2013, 03:14 PM   #4
Aug 2012
minneapolis, minnesota
Posts: 1,486
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Gonna need to get another vessel for your starters. I spent the money on an Erlenmeyer flask and love it but there are other routes to go if need be.
I hate Walder Frey...

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