I'm all for informed risk, just saying why people suggest the safe alternative! :)
John Griessen <john@industromatic.com> wrote:
>On 03/01/2012 12:06 PM, Cathal Garvey wrote:
>> Because an ultracentrifuge can kill you and is highly prone to
>explosion if used without training?
>
>Isn't this list about training? I see it going on all the time. We
>have someone
>researching ultracentrifugation and why not evolve a design? Not me
>saying
>"Do it this way and you'll be guaranteed safe.", but what guarantees
>are there
>with anything DIY?
>
>So, we've had comments about concrete for mitigating centrifuge risk,
>and that's
>good. Concrete is good. Steel plate is good. They go together well.
>Concrete is easy to form around any plastic as a mold that releases
>easily.
>So, a containment well with tapering narrower as it goes up top can
>easily be made
>for the motor/rotor to fit in with a 1/2 in steel lid over it. All the
>kinetic energy
>of the ultra rotor is angular and won't change easily, so forces are
>sideways and gravity
>keeps it down. Precession can change the angle a little, so sloping
>inward sides
>are good to keep it down, not let it climb even if it starts precessing
>around the
>containment well interior. Lining the cast concrete interior with
>smooth plastic
>such as HDPE would be great for keeping the concrete surface from
>crumbling by an
>attacking loose rotor -- how would you hot spray coat that plastic?
>
>Let's talk about it, OK?
>
>Make your ultra rotor 6 cm across of Ti metal on an air bearing, driven
>by
>an air turbine. Let it hold vials with a cone bottom that are 2 cm
>deep and 1 cm across
>holding maybe 1.2 ml at the full mark. What turbine parts are out there
>that can be re-purposed?
>What bearings does the Portescap motor company recommend for their
>70,000 RPM motors?
>
>Why not talk about it?
>
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