Magnetic stirrer and springs....

Wanted to try how far the magnetic field of my new stirrer is reaching and observes something weird...If you have a normal stirring rod in a beaker then these things do excatly what they are supposed to.Even if you try to add the rodd to an empty beaker while the stirrer is already running.The first option gives you a nice rotation, the later often just some jumping and bouncing rod.Fun fact though: Inside a stirrer rotates a magnet and the rod is just a steel bar enclosed in polyethylen or teflon.Trying to make a stirring rod roll around the center instead of rotating is next to impossible - it always tries to use the max binding force and centers itself.So I tried different things for the end goal of designing a stand up stirring twoer instead.You know, like these fancy ones found in huge water towers to agitate the water.I found a small steel ball with two magnets attached quite interesting but an accident made me wonder...For some reason I did not turn the stirrer fully off when searching my little box of goodies for new stuff to try.A small spring for some motor bushes landed on the stirrer...And although it moved dead center it did not spin at all.A slight vibration was all I could see.First weird behaviur happen when I tried to move the spring around to check why it is not spinning.Pushing it a bit lengthwise suddenly made it spin!A bit of fiddling a trying showed it works best slightly off center to the magnet with one end while sitting on the radius.The spring rotated like a horizontal drill but in no relation to the stirring speed.Second and even weirder things happened when the spring slipped through my fingers.It started to roll around the center of the plate but in the opposite direction to the magnets rotattion!An increase in speed made it roll faster until the g forces made it fly off the plate.If you have a magnetic stirrer then try it out one day.I have a few theories why the spring starts to rotate or roll but none make fully sense.Can try to take a video for those with no stirrer but for the fun of it it might be good to just mount a magnet on a motor and try LOL

Topic by Downunder35m 


Homemade pot stirrer

Hey i want to make an automatic pot stirrer something where it attaches to glass lid, - has like a wooden stirrer at bottom has anyone made anything similar before,  like this https://www.youtube.com/watch?v=-kWn8gBkZDA but wooden base would love to speak with someone in australia

Topic by peter.wilding.988   |  last reply


How to build a cheap magnetic stirrer?

I want to build a cheap magnetic stirrer. I would like it if I could get all the parts at radioshack. Not essensial though. I would also prefer using a 9 or 10 volt motor. Someone Please tell me how!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question by sci4me   |  last reply


Steves build ideas

I have made a stage coach """&a wall clock made from using cardboard and coffee stirrers ""hope you like these

Topic by StephenF120   |  last reply


10-15 AMPs w/ potentiometer.

So, as a chemist I thought it would be fun to save some $ by making my own hot plate & magnetic stirrer. I am using Thermoelectric cooling device (TEC) to heat my stirrer, and a small DC motor to stir. Here's the problem - if you've ever taken highschool chemistry you will know that a hot plate with a stirrer has a potentiometer for Temp & Stirring speed - I'd like to do the same! Problem: the TEC takes anywhere from 5-20 amps in operation @ 12 volts DC. Adding a potetiometer to this in parallel is out of the question - I can't fine a potentiometer that can handle greater than 2 watts. ( i may just be looking in the wrong place)... So.. all in all I'm looking for nearly 140-170 watts of power for my heating plate. (The motor will be using much less, almost negligble to the heating plate) So, if I can't put a potentiometer in series for power regulation, how can I get my temperature to vary? If this is going to require a circuit board, I may need some help with a design :)

Topic by GreenD   |  last reply


Looking for chemistry items/vacuums

Hey guys, I just recently got parts to make my own magnetic stirrer and heating plate for organic chemistry! I don't very well plan on getting a glass blower oven so if  you guys have any glassware somehow, please let me know. If you have old vacuums, a vacuum pump (not submersible) let me know too! thanks!!

Topic by GreenD 


Machine to mix and cook at the same time?

Hi everyone. Can anyone suggest how to safely customise a heavy duty food mixer (I have a Kitchenaid) to allow a heat source to be placed underneath? I basically need to mix and cook at the same time. There are various low-powered electric stirrers (I’ve tried using a Stirio) for domestic use, but then there seems to be nothing commercially available in-between that and huge industrial machines. Any suggestions very gratefully received. Thanks Michael

Topic by mjh12345 


How can I build an efficient thermoacoustic device with household materials? Answered

For a while now, I have been trying to build a thermoacoustic device with the following specs: -Can run with a temperature difference at around 100 degrees Celsius (ice on one end, boiling water on the other end, but it won't actually work with water) -uses normal air for the working fluid -constructed out of available household materials (or anything I can find at a hardware, office, or similar store) I have tried jamming coffee stirrers in a PVC pipe with copper wire serving as the heat sink, alternating layers of foil and two-sided tape, and for the third & recent attempt, newspaper jammed between two peg-boards (untested, but unlikely to work).

Question by Michael_Everett_Feder   |  last reply


RCX Brick Conundrum

Hi, I want to post a lego hot chocolate stirrer, which is easy to clean and works well. I need to know, however, if you mind not knowing the rcx program code. I can not find the program transmitter, so I do not know the program code. I am sure it is fairly simple, as it is only a touch sensor that is used as a button to rotate the motor. I am using the code that is already on the brick and I really want to post it. I had already made most of the video before noticing this snag. Please tell me what you think and I would be extremely grateful if you did not post this idea before me. Thanks and Happy New Year!

Topic by Constructo Man   |  last reply


Contest: Make Art From Starbucks Junk

Finally a reason to stop feeling guilty about my Starbucks addiction. I know I should be making my own coffee at home (and I do), but I can't deny my love for a double-tall latte. So what do I do with my stack of used cups and lids (rinsed for recycling!) and all the extra caffeine raging through my veins? Build a TIE-fighter, of course!Wired is hosting a Starbucks art contest. The idea is to make something cool and interesting exclusively out of Starbucks junk (cups, stirrers, drink holders, etc). Tape, glue, and string are allowed. You might consider multiple coffee-runs, or just ask the manager to sell you a bunch.As something resembling a prize, Wired will feature their favorites in an online slideshow. Fame and notoriety - it can all be yours! (Of course, we always recommend cross-posting on Instructables.)To inspire you, Wired posted this incredible TIE Fighter, made by Wired photographer Dan Winters. I don't think a Star Wars theme is required, but it almost certainly helps.Enter at Wired. May the Force (and the nondairy creamer) be with you. via MAKE

Topic by scoochmaroo   |  last reply


Magnet Challenge winners!

The votes are in! Congratulations to the winners of the Magnet Challenge!Magnet Challenge winnersShake it like a Tic-Tac! by MrMunkiMagnetic Stirrer by g0pherMagnetic Fingertip Gloves by vatosupremeMagno-Sniffer (Magnetic Sniffer Probe Whistler Thing Using A Hall Effect Sensor) by pronteonVersatile and Low Cost Digital Counter by trebuchet03MAGNETIC SCALES by puffin_juiceOK, I said there would be only five winners, but there was a tie and I hadn't specified how I would break ties, so I'll just get another ATC 1000 Helmet cam!Also, I found another Digital Spy Camera under my desk, so I'm making a special category to win this prize: To the user with the most judges' votes among all his magnet projects. This goes to FrenchCrawler for The "Improved" Ferrous Gatherer :), Coversational Magnet "Toy", "Mine" your own ferromagnetic metal (slivers)..., and Portable, Pocket Sized ROMP. While closely related, I can't quite make a case for them all being part of a single, multi-part Instructable. The entries to the Magnet Challenge were so good that we're going to send Instructables patches to everyone who entered! Thanks to everyone to who entered and to the people who helped judge the challenge: arwen, canida, fungus amungus, intoon, lebowski, and rachel.Original Magnet Challenge instructions here, Magnet Challenge Group, information about the SpyCam here, and an Instructable using the ATC Helmet Cam here.

Topic by ewilhelm   |  last reply


Creating copper nano particles

Be it conductive ink, decorations or just a special pigment for your paint project, Copper is nice.Only problem is grinding this soft metal fine enough to be of any good use.A not so well documented feature of food additives is that they often have "unwanted" side effects.In our case E300, Ascorbic Acid or just Vitamin C.So how to make copper nano particles with it you might wonder?Prepare a well saturated solution of Copper Sulphate, you find the blue crystals in the gardening section together with fertilisers.It is best to use destilled water and not plain tap water, if in doubt go at least with the demineralised stuff for batteries.Adding E300 either dissolved in water or directly as crystals will start a nice reaction.The copper solphate is reduced back to metallic copper.There are a few problems though...For best results you need a saturation copper sulphate solution, low temperatures and a magnetic stirrer.This produced the finest particles for me at around 5°C.But even warm or at room temp the constant sirring is beneficial for even particle sizes.The ascorbic acid is used up in the process as well.You can start with a little and see how much you end up with in terms of a layer of copper particles at the bottom.Adding more E300 will cause a "rain" of fine copper particles - once this no longer happens you know the copper sulphate is used up as well.A dark greenish color of the solution will indicate this as well.Getting the copper out of the glass...Keep in mind the copper is extreme fine!As long as it stays in the solution it won't oxidize or otherwise react.Once out and in contact with just water and air oxidation happens quickly, after all it is pure copper...I found removing the watery solution and then adding destilled water to repeat the process is a good start.The waste from the first round can still be usefull though...In the final round I try to remove as much water as I can and then add methyled spirit to prevent the reactions.You can use oil as well or do a quick vacuum drying and store it in a sealed and oxygen free container.What to do with it?As a condictive paint with the right binder it only needs some rubbing with a smooth tool to create a conductive cover with a low resistance.In a clear paint or resin it provides some stunning color effects.You can even dust the dry powder onto a freshly painted surface to get a copper look.Leave without a top coat and you quickly get an old copper or even green look.If you ever wanted extreme fine metal particles you will come up with more ideas...Like shielding or sintering....

Topic by Downunder35m   |  last reply