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Old 10-18-2012, 08:35 PM   #1
gizmodog51
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Default why won't my stir bar spin?

built a stir plate from a computer fan approx (82mm.) has a rehostat wired in and magents glued onto a bottle cap which is then glued onto the fan hub. i have tried different speeds, different heights , repositioning the magnets and even two different voltage supplys..6V & 9 v.still nothing.....
all i get is the mexican jumping bean routine and then off to the edge of the flask. my flask is 2000ml and the stir bar is 1" no raised ridge
am I missing something here?

thanx,

GD51

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Old 10-18-2012, 08:46 PM   #2
cavemanbrew
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Is your housing metal? If so, try plastic.

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Old 10-19-2012, 02:45 PM   #3
mbauer013
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Make sure the poles of your magnets are lined up right. the stir bars have a + and a - end. If you have two magnets with the + or - side up it will attract only one end of the stir bar and push the other away causing the stir bar to jump around. Make sure you have one + and one - then it will pull the stir bar down on both ends and hold it better. Also make sure to ramp speed up slowly.

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Old 10-19-2012, 02:51 PM   #4
gizmodog51
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plasric housing..
actually got some good advice from forum members and applied a dip tube "O" ring to the smooth bar which helped it work.
also checked some you tube clips about building stir plates and saw that several builders used a fender washer on the fan hub for magnet attachment.
did that too. seems to provide a greater magnet field using the washer and is easy to reposition the magnet if needed.
thanx for your suggestion

GD51

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Old 10-19-2012, 02:53 PM   #5
gizmodog51
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plasric housing..
actually got some good advice from forum members and applied a dip tube "O" ring to the smooth bar which helped it work.
also checked some you tube clips about building stir plates and saw that several builders used a fender washer on the fan hub for magnet attachment.
did that too. seems to provide a greater magnet field using the washer and is easy to reposition the magnet if needed. will also ramp speed slowly.
thanx for your suggestion

GD51

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