Hey guys! I'm new here and I love DIY, so figured I would contribute a little something. I know there are tons of DIY stir plates, but I made this one on my lunch break from crap I had laying around the house. Yes I know, not everyone is going to have optical termination shelves laying around their house, but I'm hoping this might spark ideas for other people on how easy it is to make a great stir plate that will last a long time! I spent about 40 minutes total.
- 13 washers (12 for the corners, 1 for the center of fan's magnet)
- Plexiglass/glass/plastic etc... (I used a scrapped fiber termshelf cover)
- 4 10-32 screws, 1 self-tapping screw to create holes
- AC powered IT cabinet fan
- Hard drive magnet on the center washer, which is apoxied/glued to the center of the fan
Since I want this stir plate to handle 2L starters AND last a long time, I want to be sure and use a fan that is very powerful - that is why I opted for an AC powered cabinet fan. Why you might ask? In my profession, I see DC fans bite the dust all the time, but I've never seen one of these AC fans take a dirt nap. They run 24/7 and are powerful enough to sufficiently cool very important equipment. If you see a scrapped/decom'd closed rack, these are typically in the top - a great score from scrap! The only issue is speed control, which I will get to in a moment, but let's get to the build!
Again, this is a work in progress, and I just did this on my lunch break today in about 40 minutes.
This is the info on the fan:
Here is the rough build:
After talking to my electrical engineer buddy, the only way you would want to control speed on an AC fan would be to do the PWM trick, or you would actually have to spec out the fan and build a controller yourself.
Fortunately, we don't have to!
Here is the manual speed control for this style of AC fan (and any AC fan on this site):
I just ordered it here: http://www.coolerguys.com/840556089346.html for about $17 shipped, and I'll update this thread when I get it in.
The stir plate DOES spin my 2" stir bar with no liquid in it, but once the stir bar tries fighting the resistance of the liquid, it cannot keep up with the hard drive magnet without having speed control. I'll let you guys know how it goes!