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Old 02-16-2013, 02:31 AM   #1
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Default Stir Plate Build

Well, I haven't been able to brew in a while as we will be moving into a house soon, but that has freed me up to do a stir plate build!

shows it in action.

Let me know your thoughts.
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Old 02-16-2013, 01:17 PM   #2
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Nice case. Like the glass top for easy clean up and seeing the innards.

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Old 02-16-2013, 03:57 PM   #3
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Yeah - the top is actually acrylic, but the idea for seeing the innards is exactly what i was going for - Thanks for the feedback!

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Old 02-16-2013, 05:19 PM   #4
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I have the parts, and I was reading a thread that said to use a spacer and washer... Well, I couldn't balance it very well. Any tips for balancing/ centering the spacer, washer, and magnets??

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Old 02-16-2013, 06:58 PM   #5
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I wound up using a 10/32 screw with nuts to adjust the spacing. As far as centering it was really trial and error until it didn't throw the stir bar as often. The washer is great as it gives metal for the magnets to latch onto.

When adjusting the placement of the washer, try to look for when the washer looks most like a circle and that is the best spot. If it looks like an oval, you have adjustments to make.

I hope that helps!

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Old 02-20-2013, 05:02 AM   #6
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I finished!! Got rid of the spacer on the fan and just epoxied the magnets to the fan hub. Even if the balance is off a bit, the magnets are way lighter than if you get off with that big washer. Runs quietly. I took pics of the control component setup. I didn't have a fan so I bought one from surpluscenter. 3 bucks. Bought a PVC box at Home Depot and scrounged wire from my old broken microwave. Paid for good rare earth magnets. Few bucks there. Radio shack for electronics. Schematic and parts shown. That should be enough to get the same parts. MSG me for more info if u need it for your build.

I used an N type MOSFET for power control. I attached a small piece of tin to the heat sink. That should be sufficient since the fan is circulating air inside the box. 10 ohm potentiometer rated for 0.5 watts. I soldered it all up. Really simple schematic that wont roast the potentiometer like it would if you try to do it in series. Besides, this smaller pot and MOSFET are probably cheaper.

image-1978971704.jpg   image-1112654791.jpg   image-2693983261.jpg   image-1980572588.jpg  
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Old 02-21-2013, 02:20 AM   #7
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Nicely done! Very efficient design at a low cost it seems.

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Old 02-21-2013, 04:29 PM   #8
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i went over board on mine...

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Old 02-21-2013, 04:32 PM   #9
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used and old Ipod as a riser.

http://cdn.homebrewtalk.com/images/7.../027-57822.jpg
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