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Old 01-10-2009, 02:57 PM   #111
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ok thanks for the info. running to lowes to get my solder gun now.



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Old 01-10-2009, 05:47 PM   #112
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Got it all put together. It is not spinning as good as it was before I assembled everything. Not sure what is going on, maybe I need a stronger fan. I tried the adding the second hard drive magnet, no luck. I cut out the switch and the pot and wired the fan right to the power, same result. in my 1 L flask, filled with 900ml of water, I am only getting a small cone. been playing with the spacing, it has improved. What it looks like is that my homemade stir bar(~1") is slowing the fan down. I wonder if breaking off the fan blades would improve anything. I order a variety pack of stir bars, so I probably should wait for them before I start replacing the fan.

any other thoughts would be greatly appreciated



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Old 01-10-2009, 06:11 PM   #113
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ignore my previous post, think I got it figured out. I changed to the aluminum top and adjusted the distance, and I got the same result as my prototype. Still does not pull the vortex to the bottom of my 1 l flask, but it goes about 3/4's of the way. good enough for me.

I ended up mounting my fan in the project box to a piece of 3/4 plywood. I counter sunk the screw and used #8 1.5" screws. These came from the bottom up. I used nuts on the screws and rested the fan on it. This way I could adjust the height of the fan with the spin of a few nuts. I will add pics if any one wants them

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Old 01-10-2009, 07:20 PM   #114
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Quote:
Originally Posted by milldoggy View Post
I will add pics if any one wants them
Add 'em!

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Old 01-11-2009, 03:50 PM   #115
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Here are three images of the stirrer built. I am flying to Cali for the week. When I get back, I will take pics of the guts. I am using a pin from a ceiling fan that I cut and wrapped in teflon tape for a stirrer. I am hoping to get better results with the stir bars I ordered.





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Old 01-11-2009, 05:25 PM   #116
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You gotta get that vortex to the bottom, mayne. Increases dissolved oxygen markedly. For me, it was as simple as 2 HD magnets and a 12 volt power supply. Take a look at the pics on page six.

One thing that strikes me is your base plate, it's metal. That will reflect magnetism, especially if it's aluminum.

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Old 01-12-2009, 02:18 PM   #117
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@ Pelikan

I tried two HD magnets, I did not see a difference. I also tried a plastic cover and did not see much difference. I am waiting for my stir bars before I make any more changes. I wanted the vortex to go all the way down, but I ran out of time.

Did you stack the two HD magnets on top of theirselves? I am using a 12 volt adapter. Can you post pics of the inside or you fan?

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Old 01-12-2009, 02:40 PM   #118
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I used the plastic cover over the aluminum cover in this build without any issues at all. Also, it looks like you mounted your fan opposite the way I set mine up. To each his own... With the same build that I originally posted using a 12VDC power supply and the same potentiometer, you should be getting a HUGE vortex with the potentiometer all the way up.

watch my video at the beginning of this thread. It starts with the potentiometer at it's highest resistance. You can see the vortex speed up and the dissolved O2 increase as I adjust the pot.

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Old 01-13-2009, 01:29 PM   #119
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could be my stirbar. Hopefully I get better results with a real stirbar. My fan was from a old PII, I wonder if the fan is just old and is not strong enough

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Old 01-13-2009, 01:31 PM   #120
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well, never make a judgement on someones design if you don't follow it... If you aren't using a stirbar, you aren't going to get the same effects as everyone else. You should be able to find 12VDC fans from a number of online companies for around 2-3 dollars if you can't find one from a more recent computer.



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