DIY magnetic stirrer

karimwassef

karimwassef

Active member
Found this ~DIY on amazon

<a href="http://s1062.photobucket.com/user/karimwassef/media/919Jk6G-FpL_SL1500__zps4c99137a.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/919Jk6G-FpL_SL1500__zps4c99137a.jpg" border="0" alt=" photo 919Jk6G-FpL_SL1500__zps4c99137a.jpg"/></a>

Would have cost $25 to build, so laziness won and I bought it.

Just thought it was cool.
 
Thats a good "cheap" way to do it..
Just a fan and an LM317 with pot/resistor for speed (voltage) control
 
I don't understand why people are using PC fans for this? They aren't designed to cope with the extra resistance and they stir much faster than a normal kalk stirrer, making them no different really than a reactor because it chalks up the water.

Why not use a motor for a rotisserie or similar and attach a magnetic base to that? It's the slow churning which we really want to keep incoming water saturated without suspending precipitate.
 
Taylor SpeedStir. Best $30 bucks I've spent for testing. Somethings aren't worth the cost and time to DIY.
 
Very cool. Thank you

Are you using it?
Have you conneted a wall wart to it so that you don't need batteries?
How long do they last?
 
My bad. Perhaps were talking about two different applications.

Looks like you guys were talking about Kalk stirrers. In that case I would definitely use a synchronous motor.
 
Synchronous motor?

Do you have one in mind that might work for me? I see that many of them are dirt cheap but I am thinking that I want one that is designed for continues use and definitely build for long a life.

Say at a speed of approximately:
mcgyvr said:
20 RPM should be plenty
Click to expand...

Do you know of a specific one that would work for me?

Thanks
 
Last edited:
20 rpm's would be way to fast for continuous use. I would suggest around 1 rpm. You're just trying to keep the kalk in suspension at the bottom of the container so new water gets saturated. You don't want the water to have calcium hydroxide being dosed into your tank. Just a nice soft mix at the bottom with clear limewater near the output.

http://www.lusolarelectronics.com/ac-motor-ac-110130v-c-1_7.html?page=1&sort=20a

There's plenty of DIY's on them. Or just copy a manufacturers design.
 
Awesome! It's so simple and clean.

Do you have a build thread on that thing? I would like to get the specs on everything, the motors the drivers, the magnets, the mounting wheels, anything that you learned while building "¦everything"¦

If you would "¦"¦Please"¦..?
 
I'm kind of with Decadence on this one, the PC fan mod was a great idea many years back when small DC motors were harder to come by, now they don't cost any more than a PC fan and work alot better for a DIY Stir plate (or any kind of stirrer for that matter) like what robcampman posted......very nice, IMHO.

The fan thing works though and if the fan ever dies it's got plenty of room in that box and all the controlls to retro in a small motor........
 
I couldn't see what kind of motots were use in the earlier post. I can certainly see how a geared motor could work better in the long run. The only think is figuring just what the right speed is before I build it. I guess that I could buy several and see what works best in my 6 inch vestle.
 
unfortunately i do not have a build log. But it is very straight forward.

Bend acrylic with blowtorch or oven into box shape
place cd-player motors
glue neodymium magnets on the disc shaped cd-holder of the motors.
connect motors to a voltage regulator.
adjust voltage until it all spins slowly.
 
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