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Old 18-09-2017, 09:01 AM   #251
strange-steve
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I cant get a decent vortex going like the one in photo on first page. I have a large stir bar, 35mm so perhaps its too heavy. Any suggestions?
I'm not sure tbh, though I wonder would a smaller fan run quicker. I use a 95mm fan and it gets a decent vortex going. That being said, you don't really need much of a vortex, as long as you're getting a dimple in the surface it should be enough to keep the yeast in suspension.
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Old 18-09-2017, 10:10 AM   #252
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afaik the ideal situation is to have the magnets a similar distance apart, as the length of the stir bar employed, that way the poles of the stir bar have the closest attraction possible to the magnets that drive its motion.
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Old 18-09-2017, 10:39 AM   #253
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Cheers guys. @JapanBrew I hadn't thought of that. I've probably got some stain knocking about in the shed.
You can just plonk the unit on a makeshift standoff in a flat bottom frying pan then lay a strip of clingfilm on top of it. Any overspill will run off the clingfilm into your pan.
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Old 18-09-2017, 05:35 PM   #254
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I cant get a decent vortex going like the one in photo on first page. I have a large stir bar, 35mm so perhaps its too heavy. Any suggestions?
I use a 35mm bar no problem. I've cut a hole in my container and used magnets that are thick enough to be raised into the dimple in the base of the flask. It's only a couple of mm but makes it run a lot more stable.

Someone asked earlier about running a 5L demijohn, I reckon this method of raising the magnets up would work for one of those too. Depends on the shape of the dimple probably, on a flask the base is raised a bit but also flat so raising the magnets into it works fine, probably different if a container uses a convex base.
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Old 18-09-2017, 07:45 PM   #255
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Success at last. Found a smaller fan (80mm) i managed to repair and my 25mm stir bar. Sure works now as you can see. Cannot turn this on full. I will get a smooth bar next and look for a box I. Cant wait to try my first starter on it. Thanks for all the help!
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