Coldbreak Brewing Giveaway - Open to All!

Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > DIY stir plate question
Reply
 
Thread Tools
Old 06-10-2011, 01:18 AM   #1
kbuzz
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2011
Location: Pittsburgh, PA
Posts: 457
Liked 9 Times on 9 Posts

Default DIY stir plate question

If I find something to encase it in, does anyone see anything wrong with using the second rare earth magnet from a hard drive as the stir bar?

Was thinking I could encase it in a food grade plastic or something...

Thoughts?


__________________
Primary: Sour Brown, RIP Stout
Secondary:
Kegged: Pumpkin Stout
Bottled:
Future Brews: a gluten-free beer for my mother-in-law, barleywine
kbuzz is offline
 
Reply With Quote
Old 06-10-2011, 01:35 AM   #2
Chrisl77
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2011
Location: Jackson, New Jersey
Posts: 792
Liked 52 Times on 44 Posts
Likes Given: 1

Default

I got my stir bar off ebay for under $10 including shipping. All the hard drive magnets i have seen are very wide and have a curve in them. I dont think they would make a good stir bar even encased in food grade plastic. Most of the ones on ebay also have a pivot ring to reduce friction.
http://cgi.ebay.com/New-1-inch-PTFE-...#ht_2290wt_817


Chrisl77 is online now
 
Reply With Quote
Old 06-10-2011, 01:55 AM   #3
zepolmot
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2011
Location: Palo Alto, California
Posts: 198
Liked 2 Times on 2 Posts

Default

That ring also helps in keeping the noise down
zepolmot is offline
 
Reply With Quote
Old 06-10-2011, 02:58 AM   #4
adam01
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: Lucas, Tx
Posts: 399
Liked 8 Times on 7 Posts

Default

Stir bar - $3.75 + 2 (shipping) = ~6 bucks

Erlenmeyer flask - ~$20

Cost of second Erlenmeyer flask - $20
+ $1000 for the pain of your wife calling you cheap...


See ebay + fisher stir bar
adam01 is offline
 
Reply With Quote
Old 06-10-2011, 05:00 AM   #5
BrewBeemer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2006
Location: island, in an atoll
Posts: 3,513
Liked 21 Times on 21 Posts
Likes Given: 7

Default

Quote:
Originally Posted by adam01 View Post
Stir bar - $3.75 + 2 (shipping) = ~6 bucks

Erlenmeyer flask - ~$20

Cost of second Erlenmeyer flask - $20
+ $1000 for the pain of your wife calling you cheap...
Wife at times a pain in the AZZ about your hobby brewing costs, PRICELESS!
__________________
Bier Jagdwaffe... Bier 30 zeit.....~~=o&o>..........
BrewBeemer is offline
 
Reply With Quote
Old 06-10-2011, 12:28 PM   #6
Hang Glider
Beer Drinker
HBT_SUPPORTER.png
Feedback Score: 1 reviews
 
Hang Glider's Avatar
Recipes 
 
Join Date: Mar 2007
Location: North Augusta, SC
Posts: 3,200
Liked 167 Times on 130 Posts
Likes Given: 118

Default

Quote:
Originally Posted by kbuzz View Post
If I find something to encase it in, does anyone see anything wrong with using the second rare earth magnet from a hard drive as the stir bar?

Was thinking I could encase it in a food grade plastic or something...

Thoughts?
even encased in something, I don't think you'll get a spin - I think the two will "lock" on each other through the glass - preventing the motor from spinning, unless the motor torque finally takes over and throws the magnet.

Those things are just too strong. Stir Bars - are they magnets themselves, or just rods of steel, reacting to the spinning magnets on the motor?
Hang Glider is offline
 
Reply With Quote
Old 06-10-2011, 12:52 PM   #7
lowlife
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2009
Location: Chicago
Posts: 692
Liked 11 Times on 8 Posts
Likes Given: 33

Default

They are magnetic. At least mine are. I have several of them and they all stick together.
lowlife is offline
 
Reply With Quote
Old 06-10-2011, 05:04 PM   #8
JoeyChopps
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2011
Location: warner robins, ga
Posts: 1,401
Liked 279 Times on 189 Posts

Default

Mines not magnetic I think they all come non magnetic but after lots of time around a magnet field they become magnetic......at least I think that's how we made a compass in boy scouts
JoeyChopps is offline
 
Reply With Quote
Old 06-10-2011, 06:48 PM   #9
Hang Glider
Beer Drinker
HBT_SUPPORTER.png
Feedback Score: 1 reviews
 
Hang Glider's Avatar
Recipes 
 
Join Date: Mar 2007
Location: North Augusta, SC
Posts: 3,200
Liked 167 Times on 130 Posts
Likes Given: 118

Default

So, perhaps encasing a 16d nail (cut to length inside of plastic tubing, silicone the ends, o-ring around the center - might make you a stirbar, Kbuzz
Hang Glider is offline
 
Reply With Quote
Old 06-10-2011, 07:20 PM   #10
Catt22
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2009
Posts: 5,000
Liked 62 Times on 59 Posts
Likes Given: 51

Default

Magnetic Stir bars have a magnet embedded inside the Teflon covering. The stir bars can be damaged by overheating or sometimes by subjecting them to a strong shock (as in dropping one on a hard floor). Ideally, the magnetic stir bars should be stored in pairs stuck together magnetically to preserve their strength.


Catt22 is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
used stir plate question Donner Chillers and Stir Plates 6 05-09-2011 01:42 AM
Stir Plate Question...way too HOT Catnip_X07 Chillers and Stir Plates 17 11-20-2010 02:25 PM
Stir plate question LKHA Chillers and Stir Plates 2 02-14-2010 08:13 PM
DIY Stir plate question gchunter Chillers and Stir Plates 5 06-05-2009 03:25 AM
Stir Plate Question jtucker101 Chillers and Stir Plates 7 03-28-2009 03:11 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS