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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > Stir plate/stir bar problem
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Old 01-18-2012, 12:36 AM   #11
wolverinebrewer
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If your magnets are strong enough it will hold the straight 1" bar. I use a flask but I also have a growler, a 1 gal carboy, and a 1 gal. glass pickle jar all with concave surfaces and I can spin a straight bar in all 3 containers and pull a 2" vortex with the containers half full. I use (4) ceramic 3/8" magnets all touching each other in a straight line and they are right up to the bottom of the flask when I'm stirring. My stir plate has a 2.75" hole in the center which allows me to see the magnets and make total use of the pull force of the magnets by not having to pull through whatever your box/ plate is made of. I raised the magnets up almost touching the glass by stacking up layers of double sided tape and sticking the magnet to that. I originally was using only 2 magnets and couldn't get them to hold. I almost pulled the trigger by buying (2) 3/8" X 3/8" neodymium magnets but then decided to use 4 magnets instead and it works beautiful.
So if I was you and didn't want to buy a flask, I would mess around with the magnets because your idea of using a straight bar in a growler can work.

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Old 01-18-2012, 03:01 AM   #12
edecambra
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I just changed my configuration on my stir plate to work with a 1inch smooth round stir bar and the 1 gallon cider jugs, which have a very concave bottom.

The key is instead of having two opposing magnets, stack the two (harddrive in my case) and get it close to the bottom of your stirbar so it holds it tight. It does not work with my octagonal bar!!!! but it works great with the smooth one.

Also I upgraded to a true 12v power supply instead of the cell phone chargers. My first configuration worked like crap mostly because I had two opposite magnets on a washer attempting to catch my bar in the middle??!?!?! just use one or two stacked to do your stirring and it will work much better.

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