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Old 01-24-2012, 01:48 AM   #1
kincade
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Default Noisy stir bar? Driving you crazy? Try this!

After doing my last 2 starters I decided I'd had enough of the constant 'pinging' of the stirbar in the flask during the night. I ordered 8 stirbars of varying sizes and shapes to test them out. ALL made noise to varying degrees.

Disappointed in my worthless expenditure and obsessive compulsive tendencies I sat down over a Dude's Lake Walk Pale. After pint number 3 a great idea popped into my head.

I ordered the following from McMaster:

http://www.mcmaster.com/#9396K15

9396K15 (Silicone O-Ring, AS568A Dash Number 010, Packs of 100, 1/4" ID by 3/8" OD)

http://www.mcmaster.com/#9396K206

9396K206 (Silicone O-Ring, AS568A Dash Number 204, Packs of 50, 3/8" ID by 5/8" OD)

The first part number fits 5/16" stirbars and the second fits 3/8" stirbars perfectly. Both are FDA approved for food contact and the temperature range is -65° to +450° F. And both made my stirbars inaudible. No more pinging, period.

I have noticed that the farther out they are, the more friction they cause, so some experimentation is good to get them as close to the center as possible while keeping the ends from rattling on the flask. This will be key with a smaller stirplate that doesn't have a lot of power to spare. The only thing I'd change is perhaps changing the second set of o-rings to a smaller gauge, perhaps

http://www.mcmaster.com/#9396K16

or

http://www.mcmaster.com/#9396K74

But keep in mind that going smaller will lessen the clearance and may not eliminate the noise. Less friction = = smaller diameter = less clearance.

I'd also add that the orings added some very nice turbulence to the tests and seemed to make the vortex more pronounced.

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Old 01-24-2012, 03:40 AM   #2
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hmm Interesting Idea. I might just give this a try. Thanks for posting.

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Old 01-24-2012, 03:52 AM   #3
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I have some extra o-rings but am swamped with work right now. If I have time, I wouldn't mind sending a few of the o-rings out to a few people as long as postage/etc is covered... I'll post when i'm a bit less busy.

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Old 01-24-2012, 04:24 AM   #4
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Quote:
Originally Posted by kincade
I have some extra o-rings but am swamped with work right now. If I have time, I wouldn't mind sending a few of the o-rings out to a few people as long as postage/etc is covered... I'll post when i'm a bit less busy.
I'd be happy to test. I have two stir plates and two sizes of stir bars. I have 2L and 1L flasks. I can reimburse postage.

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Old 01-24-2012, 04:36 AM   #5
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yeah, id be down to cover postage, great idea.

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Old 01-24-2012, 05:10 AM   #6
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PM me if you have enough for me to get in on this. My 5 liter flask drives me nuts! Great idea

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Old 01-24-2012, 01:48 PM   #7
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I have a 1L and 2L flask and I'd be happy to give these guys a test drive. Looks like an excellent idea!!

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Old 02-09-2012, 03:00 PM   #8
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Those of you who posted already please pm me your email address. I should have time in the next week to send a few orings out.

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Old 03-09-2012, 09:41 PM   #9
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Those of you who posted already please pm me your email address. I should have time in the next week to send a few orings out.
Been working a ton and haven't had time to mail these out. Will get them to those of you that PM'd hopefully this coming week.
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Old 03-10-2012, 04:51 AM   #10
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No probs here, I have been working too much as well

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