Introduction: Mixer for Test Tubes
Here I show you how to make a mixer for test tubes. It is pretty easy and you can build it in less than 10 min.
Step 1: Get a E-Motor and Magnets
Almost every e-motor will work but I prefer this tiny ones out of a CD/DVD driver. They work at 1.5 Volts and the rotation speed is not to high. The magnet I use on the shaft of the Motor is also demounted from a CD/DVD-driver (you can find 2 of them close to the lens).
Step 2: Attach the Parts
First superglue one magnet to the shaft of the motor. Do not glue shaft to the housing else it wonôt work anymore.
Secondly mount the motor to the bottom side of the rack. I used hot glue. The magnet should be close to a test tube hole. If you have a different looking rack then you have to find a place near a tube and fix it there.
Secondly mount the motor to the bottom side of the rack. I used hot glue. The magnet should be close to a test tube hole. If you have a different looking rack then you have to find a place near a tube and fix it there.
Step 3: Conect Battery
This is a easy step. Just connect the wires to a 1.5 Volts battery the polarity do not matter.
You can also put a switch into the circuit but it is your choice.
You can also put a switch into the circuit but it is your choice.
Step 4: Put a Magnet Into the Tube
Put a magnet in the tube you are about to use. I used a, 1cm (~0.4inch) in diameter and 1mm (0.04 inch) thick, neodym magnet. But you can also use the one out of the CD/DVD driver.
Do not use bigger and stronger magnets or the glass will crack.
Do not use bigger and stronger magnets or the glass will crack.