Does a longer stir bar get thrown less? - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Does a longer stir bar get thrown less?

Reply
 
Thread Tools
Old 02-23-2013, 03:03 AM   #1
zanemoseley
Recipes 
 
Jan 2009
Cookeville, TN
Posts: 555
Liked 1 Times on 1 Posts



So I have a shorter stir bar (about 1") and I've been doing large 1 gallon starters in an old pickle jar. The first time I had to turn down the speed so it wouldn't get thrown. Now on my second starter with the same bar and jar I can't get the bar to stay spinning more than a couple seconds. I really like this jar but can't get the stir bar going, I have no idea why I got it fine before but can't get it now. Will a long bar help or will it be the same?



 
Reply With Quote
Old 02-23-2013, 03:18 AM   #2
StMarcos
Recipes 
 
Apr 2008
Sebastopol, CA
Posts: 971
Liked 34 Times on 27 Posts


I find it's the other way around.



 
Reply With Quote
Old 02-23-2013, 03:20 AM   #3
MalFet
/bɪər nɜrd/
HBT_LIFETIMESUPPORTER.png
 
MalFet's Avatar
Recipes 
 
May 2010
NYC / Kathmandu
Posts: 8,632
Liked 1472 Times on 975 Posts


If the bottom is anything less than perfectly flat, being slightly off center will cause you problems.

I also prefer my shorter stir bar.
__________________
"Be excellent to each other." -Benjamin Franklin

 
Reply With Quote
Old 02-23-2013, 03:21 AM   #4
iaefebs
Registered User
Recipes 
 
Aug 2010
West Coast, MI
Posts: 2,674
Liked 245 Times on 177 Posts


I've never tried a 2"bar. I use a 1" in my pickle jar. I think the Idea is to use a bar that has the same spacing in the bar magnets as the magnet spacing on your stir plate. My procedure for getting the bar to stay spinning is to 1st use a magnet to locate the bar to the center of the jar. I then place it as close to center of the stirrer as I can and start off slow. I've gotten used to knowing if it's close to centered by the sound it makes. I turn the stirrer up enough to see the whirlpool on top and make slight moves to get it centered. When I'm confident I have it centered I turn the plate up and keep an eye on it . Sometimes it's another slight adjustment. When I'm done I have a nice dimple in the center, It's not making too much noise, and it will run forever.

BBL_Brewer Likes This 
Reply With Quote
Old 02-23-2013, 03:32 AM   #5
BBL_Brewer
HBT_SUPPORTER.png
 
BBL_Brewer's Avatar
Recipes 
 
Feb 2011
Kokomo, IN
Posts: 3,704
Liked 439 Times on 302 Posts


Quote:
Originally Posted by iaefebs View Post
I've never tried a 2"bar. I use a 1" in my pickle jar. I think the Idea is to use a bar that has the same spacing in the bar magnets as the magnet spacing on your stir plate. My procedure for getting the bar to stay spinning is to 1st use a magnet to locate the bar to the center of the jar. I then place it as close to center of the stirrer as I can and start off slow. I've gotten used to knowing if it's close to centered by the sound it makes. I turn the stirrer up enough to see the whirlpool on top and make slight moves to get it centered. When I'm confident I have it centered I turn the plate up and keep an eye on it . Sometimes it's another slight adjustment. When I'm done I have a nice dimple in the center, It's not making too much noise, and it will run forever.
That pretty much sums it up, unless you have a perfectly flat bottom like Malfet said. I don't think a larger stir bar will solve your problem. Sounds like either the bottom of the jar is too irregular or your magnet placement is off a little bit. You want to get the magnet as close to the bottom of the jar as possible. I had to sort through about 30 or 40 gallon jugs at the local fruit market to get a handfull that were suitable for stir plate duty. Once you find a good one, don't drop it. My brew buddy dropped one of mine the other day. Now I'm using a back up that makes a lot of noise and throws bars like crazy if you don't get it centered just right.
__________________
Slots Down Brewery
Stick with the plan....not the sparge.


Never Ending Liquid Yeast - How to Farm Yeast and Freeze it.


 
Reply With Quote
Old 02-23-2013, 03:32 AM   #6
KaSaBiS
Recipes 
 
Mar 2011
Cincinnati, ohio
Posts: 144
Liked 3 Times on 3 Posts


My 2L flasks get 1.5 or 2" bars. My growlers get 1" or .75" bars. Dont forget the spacing of your magnets also plays a factor!
__________________
Quote:
Originally Posted by Common N00B View Post
I just got a Mr Beer kit and want to brew a Double Imperial Blueberry Heffy Witesit....we have no air conditioning and live next to the sun...do you think I can logger and bottle this in time for a party I will be having next week?

 
Reply With Quote
Old 02-23-2013, 03:56 AM   #7
Babydom
HBT_LIFETIMESUPPORTER.png
Recipes 
 
Aug 2012
Tucson, Arizona
Posts: 16
Liked 1 Times on 1 Posts


I find that starting at a slower revolution setting and gradually increasing the speed on the stir plate reduces the chances of throwing the stir bar. Small stir bars unless I’m making a 4 to 5 liter starter than I jump to the two inch stir bar.

 
Reply With Quote
Old 02-23-2013, 04:00 AM   #8
BBL_Brewer
HBT_SUPPORTER.png
 
BBL_Brewer's Avatar
Recipes 
 
Feb 2011
Kokomo, IN
Posts: 3,704
Liked 439 Times on 302 Posts


Quote:
Originally Posted by Babydom View Post
I find that starting at a slower revolution setting and gradually increasing the speed on the stir plate reduces the chances of throwing the stir bar. Small stir bars unless I’m making a 4 to 5 liter starter than I jump to the two inch stir bar.
What kind of vessel are you making 5 liter starters in? Hopefully something cheap, because I'd like to get one.
__________________
Slots Down Brewery
Stick with the plan....not the sparge.


Never Ending Liquid Yeast - How to Farm Yeast and Freeze it.


 
Reply With Quote
Old 02-23-2013, 04:29 AM   #9
runbad
Recipes 
 
Jun 2012
Posts: 45
Liked 2 Times on 2 Posts


A shorter bar would help with the throwing issue. My stir plate has a magnet pretty much it's entire diameter so I rarely have an issue.

You don't need a vortex at the surface to promote growth. A subtle agitation should suffice in introducing oxygen

 
Reply With Quote
Old 02-24-2013, 01:54 PM   #10
f0xtr0t
Recipes 
 
Aug 2011
South, Texas
Posts: 119
Liked 6 Times on 6 Posts


I had a real problem with using a hard drive magnet. Is that what you're using? It has a curve and the magnetic field is a little tricky. The magnetic field is not exactly centered its off a little bit to the inside of the curve. This of course put my magnet just a little off center of the fan so it can vibrate and move a lot if not weighted down with a starter flask. I had to put a 1 inch PVC spacer between the fan and magnet so the magnet would not lock the fan down, so that further increased the trouble with finding center. So finding the exact center was a daunting task. I ended up just buying a 1 inch stir bar because the 1.5 was being thrown all the time.

My Homemade stir plate.


__________________
Founding Member of B.R.E.W.S. (Border Residents Engineering Wicked Suds)
I'm a beekeeper. Save the bees, Save the world.
“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!” ― Hunter S. Thompson

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ferment longer, or leave in bottles longer? Schuey102000 Beginners Beer Brewing Forum 7 09-28-2012 09:12 PM
Thrown Together Amber Ale iammatt Recipes/Ingredients 9 05-14-2010 06:21 PM
I see the name Mr. Beer thrown around a lot.... Dizavin Beginners Beer Brewing Forum 8 02-27-2009 01:44 PM
1st AG, Thrown out today 7/11/08 EamusCatuli All Grain & Partial Mash Brewing 6 07-11-2008 04:28 PM
thrown stir bar!! Seawolf General Techniques 21 04-08-2008 01:15 PM


Forum Jump