Thingiverse
USB powered Cyto Centrifuge by siderits
by Thingiverse
Last crawled date: 3 years ago
USB powered Centrifuge for under 10$.
I used a small DC motor (1.5-6 Volt, 4000 RPM) and a DC motor speed controller kit to make this USB powered Bio-Centrifuge.
The Radius is 40 mm (you can make longer rotor arms) and the motor will spin up to 4000 RPM on 4.5 volt/100 mA USB port power giving a centrifugal force of 500 gravities (link to nomogram and online calculator provided). I used 0.2 ml PCR tubes that when filled weigh-in at about 0.5 gram so at 500 Gravities, each "bucket" will weigh about as much as a half of a 17 ounce bottle of water. The capacitor across the terminals of the small DC motor provides enough energy to keep the motor running smoothly when the armature shoots by the stator and to minimize noise in the circuit (you can look that up for a better explanation than I can give).
Do you see the small piece of reflective tape on the top side of the Right Rotor arm. That's used by the Tachometer to measure the RPM. It tacked out well over 4k RPM (wicked fast).
I used an old USB cable's red and black wire to power it up (with safety gear) and it worked perfectly. Total control over speed.
If placed in an appropriate enclosure (like a metal coffee mug) you've got a cytocentrifuge that actually works and uses only USB power, for under 10 dollars.
Inspired by:
http://www.thingiverse.com/thing:33818
http://www.thingiverse.com/thing:1483
http://www.thingiverse.com/thing:12390
I used a small DC motor (1.5-6 Volt, 4000 RPM) and a DC motor speed controller kit to make this USB powered Bio-Centrifuge.
The Radius is 40 mm (you can make longer rotor arms) and the motor will spin up to 4000 RPM on 4.5 volt/100 mA USB port power giving a centrifugal force of 500 gravities (link to nomogram and online calculator provided). I used 0.2 ml PCR tubes that when filled weigh-in at about 0.5 gram so at 500 Gravities, each "bucket" will weigh about as much as a half of a 17 ounce bottle of water. The capacitor across the terminals of the small DC motor provides enough energy to keep the motor running smoothly when the armature shoots by the stator and to minimize noise in the circuit (you can look that up for a better explanation than I can give).
Do you see the small piece of reflective tape on the top side of the Right Rotor arm. That's used by the Tachometer to measure the RPM. It tacked out well over 4k RPM (wicked fast).
I used an old USB cable's red and black wire to power it up (with safety gear) and it worked perfectly. Total control over speed.
If placed in an appropriate enclosure (like a metal coffee mug) you've got a cytocentrifuge that actually works and uses only USB power, for under 10 dollars.
Inspired by:
http://www.thingiverse.com/thing:33818
http://www.thingiverse.com/thing:1483
http://www.thingiverse.com/thing:12390
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