Diy magnetic mixer

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.

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.

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.

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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.

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.

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.

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This is a magnetic stirrer, not a blender. This is basically what I was just worrying about. You want to put the fan in the middle of the top, so you can center whatever is being stirred. Next, the stirr bar. Looking my box with an assortment of electronic components most of it scavenged from scrap , I found an interesting small inductor: removed the copper wire: Then sanded the soft ferrite rod and washed it in hot acetone to remove glue traces , then water, then dried it. I found this one in my junk box. Mount the fan to the top with the appropriate screws. A similar 3D printed part acts as a stirrer, and is fitted with a matching pair of magnets, and dropped into the solution. A dremel tool is used to sand down the remainder of the blades. Most commercial grade chemical stirrers are coated in PTFE or some other plastic that specifically does not react to many chemicals. Why not use the circuit of a bldc motor and just rewind the coils or use a ferrite material shaped to redirect the magnetic flux at the top where the stir bar would be? You want to be careful doing this step, so everything looks good. The magnetic stirrer can be powered by any voltage source the fan is rated to. Some of the greatest men of science have publicly repudiated a theory which earlier they hotly defended.

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I used a fairly large one for the demonstration videos. You can use a small automotive switch, or a power switch from something else like a power supply. 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. Makes me just a little nervous about the magnet going to the tanget due to the centripetal force and blasting the glass. This will save you hours of trying to find the right socket. This design provides a fairly high-speed stirrer, but the creator suggests that adding a voltage regulator could allow you to reduce the minimum speed if necessary. This can be desirable in some circumstances. Your fan may have two wires red for positive and black for negative. The size of the flea is significant to how fast the mixture spins. They don't normally mix. The magnets in the fan's motor may push the magnets around a bit, so arrange accordingly.