Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > What Magnets/Stir Bar do you use for your Stir Plate?
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Old 01-19-2013, 10:58 PM   #21
rengelma
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Has anyone ever used on of these cross shaped stirring bars? Seems like they would generate the most turbulence.

http://www.amazon.com/dp/B007EZ3IBW/ref=biss_dp_sa1

I tested my homemade "zero cost" stir plate with a hard drive magnet in a mason jar... awesome vortex. I think I'm going to try that since I haven't spent any additional funds on this.


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Old 09-15-2013, 05:19 PM   #22
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O.k. I also picked up the small disc earth magnets from Harbor Freight. How exactly did you place them, because mine are not spinning the stir bar. I tried placing one in the middle and then three straight across and neither worked. What am I doing wrong? We use this to make colloidal silver and feeling under the weather. Help please. It would be greatly appreciated.


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Old 09-15-2013, 06:41 PM   #23
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Your problem sounds like you aren't matching the poles to the stir bar.

This article explains it pretty well.
http://www.kjmagnetics.com/blog.asp?p=stir-bars
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Old 09-18-2013, 12:54 AM   #24
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Thank you, so o.k. to put it in Lehmans terms then just flip them till they are on the side that has a stronger "attraction" for lack of better words? Did you use just one of them??? Many thanks
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Old 09-20-2013, 03:33 AM   #25
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Anyone ever use 2 bars at one time? Would it help? Would it hurt?
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Old 09-20-2013, 03:25 PM   #26
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^Did you read the whole thread?

Cheers!
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Old 09-20-2013, 03:46 PM   #27
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Quote:
Originally Posted by rengelma View Post
Has anyone ever used on of these cross shaped stirring bars? Seems like they would generate the most turbulence.

http://www.amazon.com/dp/B007EZ3IBW/ref=biss_dp_sa1

I tested my homemade "zero cost" stir plate with a hard drive magnet in a mason jar... awesome vortex. I think I'm going to try that since I haven't spent any additional funds on this.
No but I use this one:
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1


which is not the typical pill shape but more like a cylinder with some corners carved away and it works great. Very easy to spin up even in my 5L flask and seems to create a lot of liquid agitation. I use a pretty cheapo homemade stirplate which cost me only $3 for the rheostat as I had everything else and that spin bar has been rock solid on it over four starters.

I paid only $3.95 with free shipping for it at the beginning of the summer and for some reason the price skyrocketed later.
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Old 09-20-2013, 03:54 PM   #28
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double post
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Old 10-04-2013, 05:32 PM   #29
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Quote:
Originally Posted by spirulina View Post
Thank you, so o.k. to put it in Lehmans terms then just flip them till they are on the side that has a stronger "attraction" for lack of better words? Did you use just one of them??? Many thanks
North poles only attract south poles and vice versa. Stir bars tend to be north on one end and south on the other, even when they are build of two magnets. If you use 2 magnets on your stir plate, you have to make one north pole up and one south pole up or both sides of the plate will be trying to attract only one side of your stir bar, rather than each magnet separately attracting one side of the bar and matching the spin.

So.. not stronger attraction exactly, but one side will attract and the other will repel, so as long as one is up and one is down on the plate it will be able to match with the bar. Just make sure the two magnets you use for the plate attract each other on the sides you use in the up position like on the bottom picture below. On my plate, I only used one to save magnets, but I understand that when used correctly two magnets create a stronger field. No worries at all



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