I assume since you say eppendorfs, you're making an analytical ultra (as opposed to preparative). As someone gives below, the 5.56 NATO round is 11.8 grams of copper jacketed lead rifled at ~950 m/s. Assuming your 3.5 cm radius (assumed from 200,000G <-> 70,000 rpm), your eppendorfs will be ~1.2 g of plastic jacketed water travelling (tumbling) at ~250 m/s. About 1/3 the mass and 3X the velocity of a paintball. I wouldn't want to take one in the mouth, neck, eye, or groin unprotected, but with goggles and a lab coat I wouldn't be too worried about projectiles.
As others point out, the question is more about how quickly is your rotor going to wear out. I think with plastic, you should make an effective system for collecting the rotor pieces and consider them and consider them single use/disposable.
On Wednesday, February 29, 2012 9:49:14 AM UTC-6, Richard Proctor wrote:
-- On Wednesday, February 29, 2012 9:49:14 AM UTC-6, Richard Proctor wrote:
im going to be working on cathals dremelfuge. ive found a US company
called Portescap who manufacture very high RPM brushless motors that
can hit in excess of 70,000 RPM or 200,000 G .
My main concern is whether the material in 3D printing can really deal
with those kind of forces.
The balance must be that the thing is light enough to not cause the
motor to lower its RPM but be stable enough to not cause eppendorf
bullets :-s
thoughts anyone....i'll be running FEA analysis on selection of
polymers in the next week.
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