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Old 02-21-2014, 03:34 AM   #11
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A cheap and easy solution, before purchasing more stir bars, would be to wire in a resistor into the circuit, to slow down every rheostat setting!

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Old 02-21-2014, 03:39 AM   #12
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Had the same problem. Was talking to someone in my local club, he pointed out its all about how the magnets are oriented. He recommended gluing a washer to the fan, then placing the magnets on the washer. That way you can move the magnets around til it works (genius!).

Before I tried the above, I had broke my hard drive magnet. I found by spacing the two pieces further apart I was able to get a solid spin on my stir bar.

I have a 1" bar in a 2L flat (relatively) bottom Erlenmeyer flask.

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Old 02-21-2014, 02:05 PM   #13
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Originally Posted by rjmaster19 View Post
Had the same problem. Was talking to someone in my local club, he pointed out its all about how the magnets are oriented. He recommended gluing a washer to the fan, then placing the magnets on the washer. That way you can move the magnets around til it works (genius!).

Before I tried the above, I had broke my hard drive magnet. I found by spacing the two pieces further apart I was able to get a solid spin on my stir bar.

I have a 1" bar in a 2L flat (relatively) bottom Erlenmeyer flask.

That's what I think I need to do. My spacing is pretty close. I just need to open it up and adjust.


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Old 02-21-2014, 04:37 PM   #14
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I'm having this same problem with the stir plate I built. It's about a half inch gap between magnets and 1" stir bar. Using a 12v power supply and fan, 3w 25ohm rheostat it still throws with any volume of liquid. I spent $1.19 on 5 resistors (100w) on ebay, they should arrive soon. I've read of people using two rheostats, some use resistors and capacitors... I'll try the resistors, adding one at a time and see if it works.

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Old 02-21-2014, 10:18 PM   #15
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One of the things that helped my stir plate was to slide a small o-ring on each end of the stir bar.


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Old 02-21-2014, 10:50 PM   #16
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Quote:
Originally Posted by rjmaster19 View Post
Had the same problem. Was talking to someone in my local club, he pointed out its all about how the magnets are oriented. He recommended gluing a washer to the fan, then placing the magnets on the washer. That way you can move the magnets around til it works (genius!).

Before I tried the above, I had broke my hard drive magnet. I found by spacing the two pieces further apart I was able to get a solid spin on my stir bar.

I have a 1" bar in a 2L flat (relatively) bottom Erlenmeyer flask.

I did the washer trick and it's very good, don't need to glue the magnets. It also allows you to place the magnets farther apart, which I think might help too. I tried a 3/4 bar and it always got kicked, the 1" worked well bit I would love to try a 2".


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Old 02-22-2014, 01:49 PM   #17
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I found adjusting the distance between the plate and the flask solved this.


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Old 02-22-2014, 02:22 PM   #18
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Are you using an erlenmeyer flask? I had problems with throwing the stir bar when building my stir plate until I get the flask. The other things I tried (mason jars, pitchers) weren't flat enough on the bottom, but once I got the flask and discovered the trick to positioning it on the stir plate, everything worked itself out.

Just something else to consider.

John

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Old 02-22-2014, 02:52 PM   #19
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Check the bottom of your flask. I have one that has a slightly convex bottom and the stir bar never stays in the middle.

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Old 02-24-2014, 04:36 AM   #20
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FYI 100ohm resistors were too much for my biggest (12v) inverter and 3w 25ohm potentiometer combo. I dug up an old 9v power supply and a larger fan and it works a lot better.

It at least spins in 2L of wort, but before I can even deform the surface it still throws the bar... Kept my yeast off of the bottom though.

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