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Old 01-18-2013, 01:47 PM   #131
Arrheinous
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Nov 2012
Akron, OH
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If they're brushless DC motors, then that might help prevent flames (compared to brushes). Plus these things are - in general - made to run on PCs and I haven't heard of a PC fire starting with the fan.

But if you're putting a load (a pipe and magnet setup), that might create some kind of drag or wear on the motor. The other issue is if the flask/jar/growler leaks into the housing or if condensation builds up within the box and causes some kind of short.

Yet these are advertised in some cases for drying the insides of boots and have been used in fermentation chambers to push air around. Those could be considered moderately unideal and I don't think I've seen a thread around here about one catching fire.

Been around fancy industrial stirplates for a while and never heard of one catching fire either and those are built with heaters that get up to 300C in some cases. More common, something catches fire on top of them.

 
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Old 01-18-2013, 05:22 PM   #132
barrooze
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Jan 2009
Pearland, TX
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Quote:
Originally Posted by Arrheinous View Post
Nabbed your idea. Built a prototype in a cardboard Bijoux Terner tie box.
The first stirplate I made used a very sturdy cardboard box. As I was inexperienced with stirplates, I made the mistake of filling my 2000mL flask with 2000mL of wort, and THEN adding the yeast. Not usually a problem, the constant spinning typically cuts down on krausen, but this was my first attempt, and my stirbar got thrown while I was at work. I came back home to a flask that had a LOT of krausen overflowing the flask getting all over my cardboard box. The fan I used was dry still, but the box no longer was adequate to hold that starter.

Just keep this in mind when making a plate with a material that won't hold its shape if wet. FYI, had I used a foam reducer (such as Fermcap-S) as I do now, I probably wouldn't have had an issue.
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Old 01-20-2013, 05:25 AM   #133
michgan241
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Dec 2012
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ok so i think i did everything right but i cant seem to get my stirbar to spin... it kind of nervously hops around the bottom of my flask..

 
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Old 01-20-2013, 05:34 AM   #134
fc36
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May 2010
Chicago, Illinois
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I gotta rebuild my stirplate cuz it keeps throwing stirbars. Looks like I found my next fan.

 
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Old 01-20-2013, 01:34 PM   #135
SudsyPaul
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Nov 2012
Ottawa, Ontario
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Quote:
Originally Posted by michgan241 View Post
ok so i think i did everything right but i cant seem to get my stirbar to spin... it kind of nervously hops around the bottom of my flask..
Put the bar in the flask with water, and have the magnet grab hold of the bar BEFORE you start the stir plate. Start up the plate from the slowest setting up to wherever you want it, and it should work.

I had the same issue when I tried to place the flask down onto an already spinning stir plate.

 
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Old 01-20-2013, 07:01 PM   #136
DenverUSMC
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Jan 2013
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Quote:
Originally Posted by fc36
I gotta rebuild my stirplate cuz it keeps throwing stirbars. Looks like I found my next fan.
Deleted, wrong thread.
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Old 01-20-2013, 10:56 PM   #137
DenverUSMC
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Jan 2013
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Quote:
Originally Posted by michgan241
ok so i think i did everything right but i cant seem to get my stirbar to spin... it kind of nervously hops around the bottom of my flask..
Try flipping one of the magnets over, see if that helps.
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Old 01-26-2013, 08:25 PM   #138
mjap52
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Mar 2012
Amherst, New York
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My [double] take on this build!
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Old 02-16-2013, 10:40 PM   #139
zacster
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Jan 2008
Brooklyn, NY
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I finally made mine after having it sit for 2 months. It works on a medium setting, but when it is low it throws the stir bar. I get a vortex going and it seems to work fine at that point. At a high setting it throws the magnets, so maybe I'll glue them on. I just have the basic fan at this point, I'll have to build some kind of enclosure or at least a plexiglas top that's bigger than the bottom of the flask.

So how fast does this need to go anyway? I would think just enough to keep things moving

 
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Old 02-19-2013, 03:45 PM   #140
tre9er
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Jan 2012
Lincoln, NE
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Quote:
Originally Posted by zacster View Post
I finally made mine after having it sit for 2 months. It works on a medium setting, but when it is low it throws the stir bar. I get a vortex going and it seems to work fine at that point. At a high setting it throws the magnets, so maybe I'll glue them on. I just have the basic fan at this point, I'll have to build some kind of enclosure or at least a plexiglas top that's bigger than the bottom of the flask.

So how fast does this need to go anyway? I would think just enough to keep things moving
low speed is fine. It's really just to keep the yeast in suspension. Does your stir-bar have a fulcrum on it? I shaved the fulcrum off and it's working better. Prior to that sometimes I'd use cornie dip-tube o-rings on the outer edges of the stir-bar and it would run better at certain speeds. Play around with that and also the height the fan is from the flask. I also have to do different things for different vessels (I have a 2.36L pickle jar I use for larger starters and the bottom is concave, etc.)
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