Magnets for stir plate - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers & Stir Plates > Magnets for stir plate

Reply
 
Thread Tools
Old 04-17-2012, 06:39 AM   #1
mjmac85
Recipes 
 
Feb 2012
Kaneohe, Hi
Posts: 248
Liked 1 Times on 1 Posts



Are these good enough
http://www.ebay.com/itm/4-Neodymium-...e#ht_500wt_844

or these

http://www.ebay.com/itm/1-Neodymium-...#ht_1661wt_827

Also was thinking of going with a 7/8" stir bar. I will probably be using a 1000ml flask and/or a growler for my container.

 
Reply With Quote
Old 04-17-2012, 01:49 PM   #2
BigB
 
BigB's Avatar
Recipes 
 
Dec 2009
Shelby Twp, MI
Posts: 1,757
Liked 45 Times on 39 Posts


I used the round type, but I purchased them from Ace Hardware. They work good. I would be cautious about using a growler as your vessel because the bottom isn't usually flat, which would make it difficult to balance your stir bar.
__________________
I love the sound of an airlock bubbling in the morning. It sounds like.....VICTORY.

Quote:
Originally Posted by TxBrew
It's now degenerating into nu uh and uh huhs and it no longer serves a point.

 
Reply With Quote
Old 04-17-2012, 01:59 PM   #3
isukendall
Recipes 
 
Apr 2011
Fort Collins, CO
Posts: 21
Liked 1 Times on 1 Posts


Quote:
Originally Posted by BigB View Post
I used the round type, but I purchased them from Ace Hardware. They work good. I would be cautious about using a growler as your vessel because the bottom isn't usually flat, which would make it difficult to balance your stir bar.
Just made one last night. I agree that a flask would work better, but it can be done with a growler. The key for me was to get the magnet balanced in the center of the growler when you start it up, as long as I did that it worked pretty well!

 
Reply With Quote
Old 04-17-2012, 11:00 PM   #4
beardley
 
beardley's Avatar
Recipes 
 
Jan 2012
The Woodlands, TX
Posts: 25

I bought .25"x.25" square rare earth magnets and they seem to work fine. The 3/8" discs should be great. You just want to make sure you get the polarity right before you secure them. Make sure one is North and the other is South.

The bar magnets are great if they are magnetized through the length. The one you listed appears to be magnetized through the thickness. That means that one 1"x1/4" surface is North and the opposite is South. This is bad for a stir plate. You would want a bar that is magnetized through the length so one end is North and the other is South. If you don't, then you will probably throw your stir bar.

A great alternative is the magnet from an old or broken computer hard drive. You will need a Torx bit screwdriver, but those magnets are strong and magnetized along the proper axis.

 
Reply With Quote
Old 04-18-2012, 02:34 AM   #5
mjmac85
Recipes 
 
Feb 2012
Kaneohe, Hi
Posts: 248
Liked 1 Times on 1 Posts


Bought a 25mm stirbar with ring for $6 and 4 magnets for under $5. Prices include shipping. Just need to go to radio shack to get speed control. Don't think I will end up with an on off switch since I can always just unplug it.

 
Reply With Quote


Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dramatically improve your Stir Starter stir plate wildwest450 Chillers & Stir Plates 27 03-24-2012 12:05 AM
DIY Stir Plate, Stir Bar attracted to mounts littlejon326 Chillers & Stir Plates 5 03-13-2011 02:12 PM
Stir Plate w/ Stir Rod in Boil Kettle resslerk Chillers & Stir Plates 6 03-20-2010 07:10 PM
Computer fan stir plate- how many magnets? Great_Neck_Brewer Chillers & Stir Plates 3 02-14-2010 06:58 PM
Magnets on my stir plate stevecaaster Chillers & Stir Plates 2 01-07-2008 12:27 AM


Forum Jump