I tried searching to no avail - what kind of epoxy do you guys use to glue the washer to the fan? Do you also glue the magnet to the washer?
There was a post about this earlier in the thread (or maybe it was another stir plate thread). If you have a wire connected to the center post of the rheostat it will apparently cause this. You only need connections on the two outside posts.
Had a gallon of water spinning perfect, but now that I have an actual starter on it the thing is being a pita! Go figure! I know the problem is that my jug doesn't have a flat bottom, but I don't have a flask yet. Guess I better get one ordered.
Mojzis said:I have some questions for you guys. First ill say I have a bare bones education of wiring. I've installed a few lights and recepticals but that's the extent of my experience.
Anyway I picked up all the equipment for this project and started putting together last night. I picked up a 12v DC computer fan, and used my old razor charger which has a 6.5v dc output. I had it all wired up accordingly but it didn't move an inch when plugged in.
I took it apart (those dam connects cost a lot) and tried wiring it straight forward. White charger wire to red comp fan, and black to black. Nothing.
So I stripped a USB cable charger that I had laying around and hooked up the red wire to the red wire and computer fan and black wire to black wire. The other cables I left alone (green,white, and uninsulated). Then it moved. But with the magnet on top I have to spin it so it can start itself.
I hope you can tell me what I'm doing wrong.
Thanks in advance!
Mojzis said:I picked up the washer this morning. I didn't have it while wiring and I did put the magnet right on the fan.
What do you mean test for balance? Make sure the magnet is balanced on the fan?
I also bought a 2" stir bar. I hope it's not too big.
Mojzis said:I got it all glued down and set up. I got the 5.6v charger to work but it doesn't want to spin the bar. The washer is pretty thick and the magnet is 50 x 10 x 5mm. Maybe its too much weight? Would a higher voltage power source give it extra power to get the 2" bar moving or do I just have too large of a stir bar?
Also my fan is a cheap 2$ fan off ebay, maybe its too sh***y?
Sorry for the continuing questions, but this thing is frustrating.
I got it all glued down and set up. I got the 5.6v charger to work but it doesn't want to spin the bar. The washer is pretty thick and the magnet is 50 x 10 x 5mm. Maybe its too much weight? Would a higher voltage power source give it extra power to get the 2" bar moving or do I just have too large of a stir bar?
Also my fan is a cheap 2$ fan off ebay, maybe its too sh***y?
Sorry for the continuing questions, but this thing is frustrating.
A friend gave me a 120 mm 12v fan and a 12v power supply they had laying around. Re-did the whole thing and the fan if ridiculously fast now, so that's good. However I haven't got the damn bar to move. I ordered some more magnets online to see if my magnet I have isn't the right shape. I'd hate to spend the 6$ for a one inch bar instead of my 2".
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