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Old 04-05-2012, 01:47 PM   #1
dbhokie
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Default Stir Bars

So I made a stir plate recently, tested it out with a magnetic bar I had, and it works great. Well now I am buying flasks and stir-bars, so a bit of advice I thought.

Stir bars - I know they are cheap and easily found, but what about the cross ones, do you guys prefer those over a standard straight stir bar?

Flasks - Wide Mouth vs Narrow?

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Old 04-06-2012, 01:56 AM   #2
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Never tried a cross one, but between my 2" and 1 " bars, the smaller, lighter bar works better.

As far as wide or narrow, how wide are you going? I would think narrow would be easier to get a foam stopper for.

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Old 04-06-2012, 01:59 AM   #3
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I use a 1" straight bar, and it works great! My flask is a 2L mason jar and I use foil on top.

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Old 04-06-2012, 02:24 AM   #4
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What's the best speed? A strong vortex, or just lightly stirring?

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Old 04-06-2012, 02:36 AM   #5
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Quote:
Originally Posted by ScoRas View Post
What's the best speed? A strong vortex, or just lightly stirring?
All you need is a little bellybutton sized vortex. Slow and steady.....
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Old 04-06-2012, 11:27 AM   #6
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+1 on above. I have a 1" stir bar and turn it on the slowest setting. The purpose of a stir plate is to circulate the yeast so they all get maximum contact with oxygen at the top of the vessel. Faster is not better. I would be concerned that a larger stir bar may encounter increased resistance and be more prone to slinging off the magnet.

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Old 04-06-2012, 12:19 PM   #7
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Thanks much, I didn't really think the cross ones were necessary, I'll go with a little pack of some smaller ones.

I'm not really sure with how wide or narrow, just the sets of flasks I was looking at were wide and narrow mouths, I wouldn't reckon it to make much of a difference, but best to ask those with experience rather than rely on theory alone.

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Old 04-06-2012, 02:11 PM   #8
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+1 I bought a 2 inch thinking I would make this swirling tornado of killer yeast and I quickly learned that none of that is necessary. I only fought with it..

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Old 04-06-2012, 02:16 PM   #9
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I spent a lot of time getting a 2" to spin. I do think it works a little better than my 1/2" in my 4L flask, but really not a lot better. In a smaller flask the 1/2" would be perfect.

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Old 04-06-2012, 02:17 PM   #10
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I got a couple of the puck looking ones. It does well but not so much better that its worth the extra money

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