Noisy?

[actech]

Got my stir plate done and working. WOW that stir bar rattling on glass bottom really loud . Is that normal? Where do you all hide these things ? I cant imagine how loud it will be in a house at about 2 am

 

[raysmithtx]

A stir bar with a center ring is much quieter.

 

[NoahBeach]

Yeah mine isn't audible.

 

[passedpawn]

Mine was silent. Totally. My stir bar did not have a ridge in the middle. I could stir a bar 1/2" to 2". Data points for you. Good luck.

 

[actech]

hmm stir bar with ridge eh. guess need to look for one of those

 

[user 163849]

I learned by trial and error by moving the flask around on the stir plate that the noise could be limited considerably by the position of the flask. Then one day I accidentally pitched my stir bar with the yeast. Knowing that I would be needing to use the stir plate before that fermenter was emptied I immediately ordered the same brand and size of stir bar as the one which had been pitched. To my surprise the new one was perfectly quiet and no adjustment of position of the flask was necessary. The variables are many.

 

[Gnomebrewer]

hmm stir bar with ridge eh. guess need to look for one of those

My stir bar with a ridge is noisy (it sort of vibrates from side-to-side like a see-saw), the ones with no ridge are quite.

 

[actech]

My stir bar with a ridge is noisy (it sort of vibrates from side-to-side like a see-saw), the ones with no ridge are quite.

Mine has no ridge but man it rattles bad. I got some ordered so we will see.

 

[Stealthcruiser]

Tight fitting O-rings @ each end of the bar, will keep it off the glass.


Edit: Or try one in the center.

 

[jrcrilly]

I believe that they make more noise if the drive magnets aren't symmetrically spaced from center of rotation; the stir bar moves around to follow rather than rotating in place. Mine's noisy; I'm going to open it up and see if I can position the magnets better.

 

[user 163849]

As I mentioned in a previous post I ended up with two "identical" stir bars due to pitching the first one with the yeast (I ordered a second one rather than trying to fish that one out). They are both the same brand, size, shape and have the center ridge.

The first one was always a little noisy but I could minimize the noise by moving the flask around on the stir plate till I found a "quiet spot". But the second one is silent.

So in my experience, the stir bar has much to do with the noise generated. I built my own stir plate and the magnet location was tuned by trial and error to that first stir bar. Despite that fact, the second one runs more smoothly and quietly. I believe it has more to do with balance than the ridge.

 

[actech]

I got my 7 pack of bars in from China and did find one that does a good job and is quiet. I think it more the flask thou as you have to move it off center , looks like center of flask is convexed. But I can now make a starter without keeping house awake all night.