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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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Old 26-09-2017, 11:46 AM   #256
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Finally using mine. I couldnt find a suitable box so i put some lego together on top of the fan. Works for now. First starter i made didn't seem to do much. I was thinking it wasn't working but i decanted it and added more wort and its going like the clappers. I bought a few packs of cheap yeast WLP0029 and WLP800 so its been really interesting watching it revive itself.
I was watching some videos of people making thee and i noticed some are using hard drive magnets. They seem a lot stronger and one used a 50 or 60mm sit bar and the thing was stuck to it like a rock. Made me think you could probably get away with a DJ if you use stronger magnets. One man only used 1 magnet and it worked. That was a curved HD one. Also the magnets seem to be far more powerful that the stir bars. I doubt they contain neodymium which is a shame as they would be far more efficient.
Going to build another one with flashing lights on!
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Old 29-09-2017, 01:46 PM   #257
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I'm Stoll awaiting a speed control thingy. Second I've ordered and not arrived.

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