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Author Topic: Homemade Overhead stirrer  (Read 226 times)

Vesp

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Homemade Overhead stirrer
« on: June 17, 2009, 05:29:04 AM »
This idea was taken from something I found on the rhodium archive.
The improvised overhead stirrer http://www.erowid.org/archive/rhodium/chemistry/equipment/overhead.html

Here is the one I built.
It was made by cutting off the end of the beater so only the metal rod was left. This was then attached to a tube that barely went on, and attached the other end of some glass tubing that only barely went on. The tightness of the tubing connecting the metal rod and the glass tube is nice because it made it tight and harder to bend. For extra strength I have put a bic pen over the connection, which makes it even tighter and more rigid.

I am planning on using this to stir about 3 liters in a bucket, so I have attached another bit of tubing over the end. This was so the four cable ties I attached to help stir didn't move as easily as they do on glass.

I'm not to sure how long a blender like this can run, but I'd be disappointed in any product that would overheat when it has vents, etc for heat. I think it should last.

Here are some pictures of it just for fun, or to help you better understand what I'm saying.

Edit: the end of the cable ties may be cut down, but not likley for when I am stirring the bucket. When I decide to use it for a flask, I'll cut them down so they fit in the flask more easily. One nice thing about the ties is that they are flexible and can be larger then neck of the flask. I think that might prove to be useful.
« Last Edit: June 17, 2009, 05:32:45 AM by Vesp »
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Sedit

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Re: Homemade Overhead stirrer
« Reply #1 on: June 17, 2009, 04:34:51 PM »
Congrates vesp looks good. Gives me some ideas on how to attach the shaft to the motor. Keep us updated on how it works and if it over heats.
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Vesp

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Re: Homemade Overhead stirrer
« Reply #2 on: June 17, 2009, 09:09:59 PM »
It has a fan and all that jazz so it shouldn't, but who knows it was only a few bucks at walmart. It is a noisy little bastard.

Oh! and I am going to have the shaft go through something with a small hole in it to help stabilize it. Otherwise I think it will start to jerk around to much, even though it doesn't at the moment.
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v16

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Re: Homemade Overhead stirrer
« Reply #3 on: June 17, 2009, 09:54:57 PM »
I use a 2 hole stopper, put a glass rod through one that just fits over your shaft, then put some glycerol on the shaft, seal and lubricates.

second hole i use for a vent.



Vesp

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Re: Homemade Overhead stirrer
« Reply #4 on: June 17, 2009, 11:40:40 PM »
I'd probably do that if I were going to use it for a flask, but right now I am going to use it for stirring in a bucket. Good suggestion.
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Re: Homemade Overhead stirrer
« Reply #5 on: June 18, 2009, 02:48:15 AM »
oh then just poke a whole in the lid.  8)

POSEIDON

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Re: Homemade Overhead stirrer
« Reply #6 on: June 18, 2009, 03:12:32 AM »
The chemists are a strange class of mortals, impelled by an almost insane impulse to seek their pleasures amid smoke and vapour, soot and flame, poisons and poverty; yet among all these evils I seem to live so sweetly that may I die if I were to change places with the Persian king.
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Vesp

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Re: Homemade Overhead stirrer
« Reply #7 on: June 18, 2009, 08:15:26 PM »
Thanks, I have actually made a ghetto magnetic stirrer that has no control for speed, etc. It doesn't really work well enough to have uses for a lot of things unfortunately and I should consider making a better one.

It is made from a CPU fan and a few magnets. I posted a thread on it a long time ago I believe.

http://www.youtube.com/watch?v=n7cKbIxnTdA&feature=channel
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German

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Re: Homemade Overhead stirrer
« Reply #8 on: August 03, 2009, 01:54:28 AM »
Dentists use stirrers to stir their teeth formula shit. They are no more then 3 feet high and are only $200 on Ebay. They are really good and will quickly stir up to 10 gallon buckets.... I'm wondering what kind of sparks might be going on inside the motors of homemade stirrers. Could be an issue if you have hydrogen gassing off your stir.

Prepuce1

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Re: Homemade Overhead stirrer
« Reply #9 on: August 03, 2009, 07:13:51 PM »
Quote from: POSEIDON on June 18, 2009, 03:12:32 AM
Hey vesp look this link about magnetic stirrer
http://www.erowid.org/archive/rhodium/chemistry/equipment/magstirrer.html

I've tried making one of these, but have never been able to get it to work. As far as I know there's no way to control the speed of shaded pole motors, which is what this uses. (It might be possible with PWM, but that's not really practical.)

PP

Vesp

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Re: Homemade Overhead stirrer
« Reply #10 on: August 14, 2009, 06:40:16 AM »
Quote from: Prepuce on August 03, 2009, 07:13:51 PM
Quote from: POSEIDON on June 18, 2009, 03:12:32 AM
Hey vesp look this link about magnetic stirrer
http://www.erowid.org/archive/rhodium/chemistry/equipment/magstirrer.html

I've tried making one of these, but have never been able to get it to work. As far as I know there's no way to control the speed of shaded pole motors, which is what this uses. (It might be possible with PWM, but that's not really practical.)

PP

Sorry that I am just noticing this now, but as for the magnetic stirrer speed control all I do is use a CPU fan, and attach it to an adjustable power supply. That allows for some nice speed control. I used to use multiple different DC adapters from cell phones, toy cars, etc but obviously that proved to be a pain in the ass.
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Vesp

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Re: Homemade Overhead stirrer
« Reply #11 on: August 24, 2009, 03:30:20 AM »
Oh by the way, if anyone was wondering about how long these types of blenders/overhead stirrs can last while on, It seems indefinitely.
 I finally used this overhead stirrer for a significant amount of time, from 4PM to 5AM, half the time  it was on the highest setting. It was in a fume hood, which was also running but I didn't have any problems with it at all when it came to over heating, etc.

I Also made a slight modification, I cut the handle a little bit and wrapped black electrical tape around it so my clamps could get a much better grip on it, ensuring it wouldn't vibrate its way out.

Also I've been using a small 1 holed stopper to connect the glass rod to the metal rod. This is easier then the bic pen method, which is harder to fix if you so happen to drop the glass stir stick, as I did. The disadvantage with the rubber stopper is that it is a bit bulky and can sometimes get in the way of things.

This was stirring a large amount of toluene at 45*C - which I was worried it would ignite. Hence it was being ran inside a fume hood which was also being ran continuously. A bucket lid, with only a small hole for the glass rod was over the reaction anyways, but it was just laying on top of the large glass container.
« Last Edit: August 24, 2009, 03:33:29 AM by Vesp »
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WazOne

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Re: Homemade Overhead stirrer
« Reply #12 on: January 27, 2011, 02:35:17 AM »
Hey vesp how load is that mixer?

heres one i prepared earlier.

Its an old fan motor..Its as quiet as a mouse. The rod is from a milk shake maker. But any stir rod will screw in nicely.
Tested in a bucket run smooth all day in 8litres water.
The piece that is used to fix the rod is from the cylinder type fans out of a A/C unit. Just hafta drill the other end.
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