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Old 01-11-2013, 02:44 PM   #1
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Default Stir plate advice

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
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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
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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
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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.
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