Home Laboratory: DIY Hot Plate Stirrer

[MuricanSpirit]

I fail to see why I should pay about 1000$ for a hotplate/magnetic stirrer if the tech is so simple.

Is it possible to just throw a hotplate over a stirring plate (if the stirring plate is strong enough to keep rotating eg. 5cm distance). Im not sure if the magnetic field interfers in any way with the hotplate.

I saw on youtube DIY videos how some ppl use pc fans with glued magnets to cause a stirring. Is it possible to use those fans at the side instead of below?

Spoiler: Dont worry those fans will rotate even if they are melting down.

Are there any other ways to cause the solution to move?

Inspiration:

Spoiler: Random DIY Video 1 (worst "heating plate" ever)

Spoiler: Random DIY Video 2 (more than ok)

Spoiler: Random DIY Video 3 (best one)

 

[G.Patton]

Video links don't works from TOR

 

[MuricanSpirit]

Hmm they seem to work for me? I'm also using TOR.

 

[banister]

Dayum son!? Where are looking at for these? You don't really need a laboratory approved hotplate/magnetic stirrer that rapes budgets of schools and hospitals.
Check out also kitchen restaurant gear. They have the very same thing, without the cool software and wires that come with the laboratory ones. They still have a meter to tell you temp, rotation RPMs etc. Which in the end is what you need. Then you can also purchase different pellets, the stirrir basically, in different weights, sizes, of course for different situations. Consider chemistry and cooking same same but different. Some tools are available for cheap in places you never thought to have looked because they are not advertised to a certain market same. I got a bad ass CorninWare one for $100 from eBay of all places. Works great.

 

[41Dxflatline]

You should take a look inside my chinese stirrer hotplate I bought a long time ago. There's nothing in there even thought it's massive in size and heavy due to being made of steel plate, it's all shoddily hand soldered and you cannot choose a temperature. They appear to still be making variations on it, some with actual digital temp control. I think I'm gonna upgrade it into something more useful

 

[Mr Good Cat]

You can buy Vevor. They ship from the EU, so there is no customs, and you won’t cause suspicion. Pretty cheap.

VEVORMagnetic Stirrer | VEVOR EU

Get free shipping on qualified Magnetic Stirrer in the Lab Department at lowest price and fastest delivery in 2 days.

eur.vevor.com

 

[senseiFreu]

Actually, anyone with a little bit of knowledge in electronics could make this. It seems quite simple to build. Maybe one day, I can shoot something better than these garbage videos and upload it here. I'll probably prepare a system that I can control everything from an interface and share the codes I write for free. Maybe one day...

 

[Osmosis Vanderwaal]

Yeah vevor and others make 5L capacity ones for around $300 usd, and one could easily be built for that price that could really be powerful.
A piece of sheet metal a couple rheostats, an actual full size stove burner element... You know, I would buy a nice hotplate for about $150, add another rheostat, an a/c motor and a bar with magnets right up the middle ( or maybe 2 pulleys and a drive belt. Pip that sheet metal cap off the middle of the element and have one that could stir 10 gallons of differential grease for $309/0

 

[workworkwork]

I will have to make an heating mantle because I cannot buy a 20L mantle anonymously. When I was ready to buy it I found weight was more than 25kg and the box was 70cm, to big for lockers.
Would be perfect diy a magnetic stirrer to put in the bottom of the big aluminium pan but I think the computer fan from the diy tutorial is not strong enough for that, is necessary buy a 12v motor. To much difficult to do it. Maybe someone 1 day makes a tutorial to make big magnetic stirrers. With a strong magnetic stirrer not necessary use a mechanical stirrer... would be so much easier work in the lab.

 

[UWe9o12jkied91d]

12v dc motors are easy to regulate with a potentiometer.I built a prototype overhead the other day just to see if I could and I will refine it in the future.Thinking 3D printed case, brushless motor and other ammenities.

 

[workworkwork]

and that heating mantle also was made by you?

 

[UWe9o12jkied91d]

No, that is a women's wax melter, goes to a bit over 100

 

[Mr Good Cat]

Also looking for the mantle. How much is this one? Is it adjustable?

 

[UWe9o12jkied91d]

Yes, it goes from 30-100, womens shaving wax melter.It’s commonly called a fornello.

 

[41Dxflatline]

Here's the garbage I was talking about the other day. Vevor sells a variation of these

 

[workworkwork]

My Vevor magnetic stirrer 5L 500w, stopped working in the first day of use. I did a bath sand to heat water as a test and it stopped working in minutes. I searched in google what the problem could be and found is always necessary it have a liquid to work as a heatsink for the hotplate, so i cannot make bath sands.
Because the hotplate was broken, I opened it and found it worked if I disconnect the internal temperature probe screwed in the ceramic hotplate. Now I have it working again! Without temperature control from the hotplate but it has an external temperature probe.

 

[SkylineSalesCannaboids]

My vevor heating went out after 5 uses

 

[workworkwork]

This guy makes a diy magnetic stirrer with a stronger 12v motor then the small motor from pc fans. He glues something to the motor but I cannot understand what is.

 

[41Dxflatline]

I only skipped through the video but I can't see anything but 2x square plate washers, epoxy putty and a magnet?

 

[workworkwork]

41Dxflatline Oh, that square things are plate washers, mystery solved, just a support for the magnet. Thanks!

 

[HerrHaber]

built several stirrers from PC fans and the only problem is that they start on high speed and it can't be lowered to optimal rpm

 

[ruen]

Buy a pwm duty cycle regulator (just google that), or make it urself if you got basic soldering skills using a transistor (depending on ur motor used), 555 timer, potentiometer and some diodes