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# Convert g into rpm

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### #1 Minnie Mouse

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Posted 09 May 2009 - 09:06 PM

http://www.beckmanco...s/rotorcalc.asp

### #2 alan6017518

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Posted 28 May 2009 - 07:48 AM

Nice, do they have it for eppendorf centrifuges?

### #3 Dr Teeth

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Posted 28 May 2009 - 12:05 PM

The relationship between revolutions per minute (RPM) and relative centrifugal force (xg) is:
g = (1.118 × 10-5) R S2
where g is the relative centrifugal force, R is the radius of the rotor in centimeters, and S is the speed of the centrifuge in
revolutions per minute.

You can use this for any centrifuge, just measure the radius of the rotor from the center to outer edge.

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Science is simply common sense at its best that is rigidly accurate in observation and merciless to fallacy in logic.
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### #4 hobglobin

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Posted 28 May 2009 - 12:17 PM

You can use this one for all centrifuges too, if you're lazy. Even with a Nomogram for it.

One must presume that long and short arguments contribute to the same end. - Epicurus
...except casandra's that belong to the funniest, most interesting and imaginative (or over-imaginative?) ones, I suppose.

### #5 array75

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Posted 18 January 2010 - 07:37 AM

...at least our new eppendorf 5430 R centrifuge in the lab has a button "rpm/ rcf" for automatic conversion of the rpm-value in g and vice versa - pretty easy to handle,-)

Edited by array75, 18 January 2010 - 07:38 AM.

### #6 michaelmast

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Posted 25 February 2010 - 07:54 AM

Go to the Beckman website and check or look at their catalogue. They have the rotors' radius there and also instruction about how to calculate g... If you are using other types of rotor then check the appropriate producer's catalogue. Calculating g may also depends on where your centrifuged particles are, e.g. the g for the pellet at the bottom of the tube is different from the g of the particles at the middle of the tube (if you are doing sucrose cushion or gradient for example)

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