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Old 02-14-2011, 10:29 PM   #1
Atl300zx
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Jun 2007
Hoplanta, Georgia
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This was one of the easier and more fun projects that I've completed.

I got the project box, a switch, potentiometer, and a female power plug from Radio Shack and the rest scavenged from around the house.

Parts List

Project Enclosure (8x6x3")
25-Ohm 3-Watt Rheostat
Rocker Switch
Fan from Computer Power Supply
Magnet from Hard Drive
Stainless Steel Washer (don't know size)
9V Power Plug from old cell phone
4 Screws, 8 nuts, 4 nylon spacers, and some washers
Some wire (~ 2 ft)

I drilled up the project box for the power plug, switch, and rheostat, then soldered everything up as shown in the pictures below.

I had 4 machine screws and some matching washers and nuts lying around the garage. I had to slightly drill out the holes in the fan for these to pass through.

I used the stainless steel washer as a spacer to keep the magnet off the fan. You have to use a non-magnet spacer here otherwise the magnet will interfere with the fan. I attached the washer to the fan with industrial velcro and the washer is glued to the magnet. This allowed me to adjust how the magnet/washer sat on the fan to better center it. If its not centered well, you the stir bar is more easily thrown.

I have a 2" stir bar that I want to trade out for a slightly smaller one.






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Old 02-22-2011, 05:33 PM   #2
passedpawn
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In my experience, the hard drive magnets will throw a 2" bar. I built a couple of these types of stir plates, and each time I stacked 3 magnets. It would spin a " bar great, but not the 2".

If you really want to spin that 2" bar, try two sets of magnets, spaced apart. One of the piles needs to be inverted to get the opposite pole facing up. I did this and it works great.

See this post for pic.
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Old 02-22-2011, 05:38 PM   #3
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Very informative thread. I have seen these DIY builds on here before and was always planning on someday building a stirplate, but never got around to it.

After seeing this and also having to deal with a nagging SWMBO about the spilt wort on the tile counter due to me shaking a mason jar a little too furiously, I am definitely going to build this.

Cheers!

 
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Old 02-22-2011, 06:17 PM   #4
passedpawn
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Sorry to hijaak your thread... here's how the magnets look in order to spin a 2" bar. Remember to reverse polarity on one of the piles! (circular metal plate was cut from a coffee can with tin snips and hot-glued to fan... makes mounting magnets a breeze).



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Old 02-22-2011, 08:22 PM   #5
Atl300zx
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Jun 2007
Hoplanta, Georgia
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i have used my 2" without issue for days. I do have to center it perfectly. it usually takes me 2 to 3 tries to get it right. I will be getting a 1" eventually, but the 2" is working, so why fix whats not broken.
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Jaded Spirits Brewery
Primary: Dennis Hoppier III
Secondary: Empty
Bottles: Triple Berry Apple Cider, Cote Apple Cider, Wild Blackberry Apple Cider, Dim Wit II, Mighty Porter
Kegs: 4Cs IPA - The Diamond Standard, Innis & Gunn Rum Cask Clone.
On Deck: The "Three Stouts", Wild Blackberry Mead, Irish Red

Jaded Spirits DIY Stirplate
Blog @ JadedSpirits.com
Blog @ HBT

 
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Old 02-25-2011, 06:01 PM   #6
kpr121
 
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Just to let you know, the rheostat you are looking for is a 25 ohm rheostat, not 5. I spent like 5 minutes in radioshack looking for a 5 ohm one. I guess I could have been less lazy and clicked the link.

 
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Old 02-25-2011, 10:21 PM   #7
Atl300zx
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Jun 2007
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Quote:
Originally Posted by kpr121
Just to let you know, the rheostat you are looking for is a 25 ohm rheostat, not 5. I spent like 5 minutes in radioshack looking for a 5 ohm one. I guess I could have been less lazy and clicked the link.
Updated OP. Thx
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Jaded Spirits Brewery
Primary: Dennis Hoppier III
Secondary: Empty
Bottles: Triple Berry Apple Cider, Cote Apple Cider, Wild Blackberry Apple Cider, Dim Wit II, Mighty Porter
Kegs: 4Cs IPA - The Diamond Standard, Innis & Gunn Rum Cask Clone.
On Deck: The "Three Stouts", Wild Blackberry Mead, Irish Red

Jaded Spirits DIY Stirplate
Blog @ JadedSpirits.com
Blog @ HBT

 
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Old 03-10-2011, 01:12 PM   #8
Anthony_Lopez
 
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Nice stir plate... looks some what familiar...
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Old 03-10-2011, 02:46 PM   #9
Atl300zx
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Jun 2007
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Hell yeah, i copied the heck outta you. Nice quotes by the way.
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Jaded Spirits Brewery
Primary: Dennis Hoppier III
Secondary: Empty
Bottles: Triple Berry Apple Cider, Cote Apple Cider, Wild Blackberry Apple Cider, Dim Wit II, Mighty Porter
Kegs: 4Cs IPA - The Diamond Standard, Innis & Gunn Rum Cask Clone.
On Deck: The "Three Stouts", Wild Blackberry Mead, Irish Red

Jaded Spirits DIY Stirplate
Blog @ JadedSpirits.com
Blog @ HBT

 
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Old 03-10-2011, 03:47 PM   #10
wegz15
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Oct 2009
Northbrook, Illinois
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Quote:
Originally Posted by passedpawn
Sorry to hijaak your thread... here's how the magnets look in order to spin a 2" bar. Remember to reverse polarity on one of the piles! (circular metal plate was cut from a coffee can with tin snips and hot-glued to fan... makes mounting magnets a breeze).
What size magnets did you use?

 
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