Re: [DIYbio] DIY Centrifuge

On 02/04/2015 11:17 PM, Subin e k wrote:
> BLDC motors with 25k rpm(dont have that much torque)

That sounds OK. Like Flip mentioned -- it needs to be designed so it cannot come unbalanced, or
if it is possible for liquid to escape holder wells, that the unbalanced rotor is contained
in a big strong chamber as it spins down.

The motor is the easy part.

A rotor that could not come unbalanced would have slanted wells
with no exit for liquid from a broken vial. If there was a swing out mechanism for a vial, it would be surrounded
with a strong containing zone -- strong as in machined all of them from one aluminum cylinder -- such that
escaped liquid would stay in the same angle position slot, and just move outward some so as to minimize
the unbalance. Swing out mechanisms make design tricky. They could fail. Lose them somehow.

If machining a big rotor for lots of 100ml vials seems too much, you could make a strong steel
containment zone and a light rotor with swing outs and make the motor to rotor connection flexible and break-away
in case of imbalance and let the destruction stay in the container. Also make the container weigh
20X the payload of vials and rotor weight. The strong lid needs to lock in place.

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