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Old 04-22-2009, 01:39 PM   #231
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Originally Posted by wwwdotcomdotnet View Post
also, how long before pitching do you guys turn off your stir plate? i am assuming the yeast needs to settle a bit before? could you throw the flask in the refrigerator to help separate the yeast?
As usual, it all depends. When you have the time, put the flask in the fridge and let it settle overnight. When you don't have the time, a few hours or even less will let much of the yeast settle.

Yes, cooling speeds up the the settling of the yeast, or at least it appears to do that. Lager yeast are a little different. They enjoy cooler temps and won't settle out as easily when the flask is cooled. I always allow enough time for a lager starter to finish out completely. I thien chill it for 24 hours before decanting and pitching.

You can leave a little wort in th flask after decanting and use the stir plate briefly to mix it up some prior to pitching.
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Old 04-22-2009, 02:26 PM   #232
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I got mine together last night and did a trial run. I don't know why but at times the stirbar seems to clatter but only on high. I used the K&J magnets that Anthony recommended I had to space about 3/8's of an inch apart on the washer . The power source is a 12v charger for one of those booster battery packs to jump start cars . Here is a video of it in action

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Old 04-22-2009, 02:39 PM   #233
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Looks really good!
Thanks for the video!
I believe the chattering you hear is the vortex reaching the stir bar and sucking air creating turbulence, very similar to pump cavitation.
Of course, you won’t be running the vortex that violently while making a starter. Just an inch or two from the surface, enough to keep the yeast in suspention. You may want to see if your power supply will allow the stir bar to turn slow enough for that.
Cheers,
-David

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Old 04-22-2009, 02:49 PM   #234
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On slow it will only make the vortex about an inch. Its also spinning 2000ml of plain water I would think that wort with yeast would be a little more viscous

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Old 04-22-2009, 03:03 PM   #235
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Mine clatters a little when the flask isn't centered over the fan. I can often move the flask just a bit and it quiets down.

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Old 04-22-2009, 10:07 PM   #236
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On slow it will only make the vortex about an inch. Its also spinning 2000ml of plain water I would think that wort with yeast would be a little more viscous
I can always tell when the fermentation has taken off as my stir plate has a more difficult time maintaining a full vortex. Must be the viscosity issue you allude to.
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Old 04-22-2009, 11:39 PM   #237
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The chattering is definitely either the bar not being centered in the flask or (most likely) the air being pulled into water/solution. U should be able to hear it in the original video I posted.

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Old 04-23-2009, 12:44 AM   #238
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Quote:
I found that positioning the magnets while the stir bar is on top helped me find the magnetic center and the rotational center.
This is a magnet and the 1" stir bar configuration that works.

So that lead me to take a couple of smaller magnets and spread them out. Now the configuration looks like this for a 2" bar with a 2" magnet spread.
I ordered my magnets and stirbar today, going to Radioshack to pick up other components tonight. I bought from K&J magnetics, I got two 1/2" x 3/8" N42 discs that I am going to try and make work with the 2" stirbar I ordered.

If I remember correctly the distance between the magnets must be at least the length of the stirbar (like in the quote)?
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Old 04-23-2009, 04:39 PM   #239
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Can anyone post a link to a 25 ohm potentiometer (linear) in a 16mm or 24mm case from Mouser or Digikey? I've ordered plenty of parts from both vendors in the past, but I'm having trouble finding anything less than 100 ohms.

I tried RS, but you know how that goes...

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Old 04-23-2009, 04:42 PM   #240
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I did find the part on the RS website, but I'd prefer to order from another place where I can get a bunch of other stuff for unrelated projects to justify the shipping.

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