Diy magnetic mixer

I needed a magnetic stirrer to keep some cells agitated for cell culture, diy magnetic mixer, but didn't want to spend the thirty or so dollars needed to buy one. This magnetic stirrer uses an old computer fan and some cheap neodymium magnets with a moldable plastic stir bar.

This instructables is to show how to build your own magnetic stirrer from parts you may have at home. This one was built to mix E-cigarette vape juice. You could use it to stir almost any liquids, so it can be used for mixing vape juice, mixing for cooking, or in a chemistry lab. Box - anything square ish and preferably plastic in case something comes loose. That is a fan from a donated junk computer.

Diy magnetic mixer

A magnetic stirrer is a handy item to have at hand for a range of applications, including agitation, dispersion, and dissolution. We did some digging to find out and discovered there are quite a few viable options available. While a home-made stirrer is unlikely to give you the power and speed control of professional-grade equipment, it could be sufficient for some applications. An online search will provide you with several different types of magnetic stirrer designs. We take a look at some of those here, making note of some of the advantages and drawbacks of each design. This set of instructions uses a fan-based setup. The main component of the stirrer is an old computer fan with magnets glued to it. One of the trickiest tasks is mounting the magnets correctly. One magnet should have its north facing upwards and the other its south facing upwards. The magnets should be positioned directly across from each other. Because the motor contains magnets, it can be difficult to align the two magnets such that there is minimal vibration when you switch the fan on. Spacers are needed to sit between the fan and the flat top due to the extra height created by the magnets. Something as simple as coins can be used here, but the creator used small pieces of plexiglass, the same material that is used for the plate of the stirrer. The creator mentions that you can choose from a range of voltage sources as long as the fan is rated to it. You just need to make sure that at the rated speed, the coupling between the magnet and the stir bar is strong enough.

Put the power cord through the hole diy magnetic mixer the back of the box, diy magnetic mixer, and tie a knot in it so it won't pull back through. Here are the materials needed: Computer fan Small neodymium magnets Moldable plastic for the stir bar Lexan or similar plastic Batteries and holder Superglue One of the trickiest tasks is mounting the magnets correctly.

When mixing or agitating delicate solutions in the chemistry lab, a magnetic stirrer is often the tool of choice. The build consists of a 3D printed base, containing a simple brushed motor. This is hooked up to a motor controller fitted with a simple potentiometer for adjusting the speed of rotation. The motor is then fitted with a small 3D printed spinner containing two magnets. A similar 3D printed part acts as a stirrer, and is fitted with a matching pair of magnets, and dropped into the solution. The magnets in the stirrer are attracted to the ones on the end of the motor, and so when the motor spins, the stirrer spins in the solution, with no physical contact required.

I needed a magnetic stirrer to keep some cells agitated for cell culture, but didn't want to spend the thirty or so dollars needed to buy one. This magnetic stirrer uses an old computer fan and some cheap neodymium magnets with a moldable plastic stir bar. Prepare and clean the fan for use. Your fan may have two wires red for positive and black for negative. If it has three wires, the white wire is a tachometer and is not needed. Glue the magnets on opposite sides of the fan head. The magnets in the fan's motor may push the magnets around a bit, so arrange accordingly. I arranged the magnets to have opposite polarities facing up. The magnets will increase the profile of the fan, so you will need spacers before putting a flat surface on top.

Diy magnetic mixer

The magnetic stirrer is a useful device for any home scientist; it is effective, cost-efficient, and is easy to make and use. The DIY magnetic stirrer attracts a lot of attention, but is often disregarded as being too difficult to make, usually because of the potentiometer used to control stirring speed, and the challenge one faces in calculating the right potentiometer to use. In this Instructable, we will not use a potentiometer , and will still be able to control stirring speed. The stirring action is achieved through magnetism. Inside a project box, there are two magnets glued to a fan which spins, powered by the 12V DC power supply, and controlled by resistors on a rotary switch. Above the lid of the project box, a beaker sits, and inside the beaker, a magnetic stir bar is placed. The magnetic stir bar corresponds with the magnets inside the project box, and will move as the magnets on the fan move, as it is attracted to the poles of the magnets.

Anthony panza

Connect the appropriate pole of the potentiometer to the positive yellow if present, or red. Detail: A cheap plastic bowl was used as this 'upper surface': glued: and this was glued above an old ATX PC power supply with most of it wires removed. The magnets should be positioned directly across from each other. First picture shows all parts red layer is water with colorant and clear layer is mineral oil. Fourth Picture is a macro to the "whirlwind" I don't know the proper word in english which is barely visible btw. Glue the magnets on opposite sides of the fan head. Because the motor contains magnets, it can be difficult to align the two magnets such that there is minimal vibration when you switch the fan on. It's 12VDC 1. The creator has forgone glue in favor of tape to hold the magnets in place. Mount the fan to the top with the appropriate screws. Participated in the Tools Contest View Contest.

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The magnets in the stirrer are attracted to the ones on the end of the motor, and so when the motor spins, the stirrer spins in the solution, with no physical contact required. Participated in the Tools Contest View Contest. An online search will provide you with several different types of magnetic stirrer designs. That's why the commercial stirrers are always build in such a way that spillovers can not make it to any electric component. The additional slots in the mount are there in case you need to use a large stir bar and want to space magnets farther apart. For this demonstration, I used a fairly large flea, because of the thickness of the oil and the total volume. Cut the connector off the power cord. Not worth the effort. To extract it from a hard drive will be a little fun work. The use of a proper brushless motor with any number of poles and high flux density gives you a reasonable KV constant to work with, trading voltage for current to achieve the same mechanical power with good enough efficiency. Mount but do not wire the potentiometer and power switch Carefully center the fan on the top, and mark your four mounting holes. Eventually I snapped off a few pieces of spare plexiglass I had lying around and glued them to the edges of the fan. Take the hard drive magnet, and try to center it as best as you can on the fan.