[DIYbio] Re: Eppendorf 5415 centrifuge: How to remove the rotor?

Hola a todos
También tengo ese problema. Aunque  el tornillo que sujeta el rotor al eje de la centrífuga no puedo extarer el rotor. Eso se hace con una herramienta denominada "extractor". Los extractores son de varios tipos. Una de ellas es de la siguiente forma: pieza cilíndrica que por un extremo presenta rosca externa y es un o dos centimetros  hueca por el centro y por el otro lleva una marca para poder enroscar la pieza en el rotor. Si os fijais, el rotor tiene una rosca rodeando el eje y una tureca acabada en una bola central que lo fija al eje del motor. La tuerca puede aflojarse y no se sale porque tiene una arandela que se lo impide. Pero al aflojar esa tuerca se queda totalmente libre. Bien, esto consiste en aflojar la tuerca de fijación un poco sin liberarla del todo y roscar el extractor en el rotor hasta que la parte no hueca del mismo haga fuerza sobre la cabeza redonda de la tuerca de fijación (que es más elevada). De esta forma se hace una fuerza inversa sobe el eje hacia abajo y sobre el rotor hacia arriba que lo libera. Con liberarlo un poco, uno o dos milimetros es suficiente. Entonces se desenrrosca el extarctor, se termina de aflojar al tuerca de fijación y se extrae el rotor hacia arriba. 
Estro mismo se puede conseguir con un extractor que sujete el rotor por 3 puntos en su parte más externa y haga fuerza sobre el eje del motor.

Esto es sencillo. pero ¿quien tiene o dónde puedo encontrar ese extarctor?


El viernes, 19 de agosto de 2016, 20:18:51 (UTC+2), jarlemag escribió:
I recently bought an Eppendorf 5415D centrifuge, and have tried to remove the rotor for cleaning and inspection. I don't have a rotor key of the kind that is sold by Eppendorf, but the item description at http://www.capitolscientific.com/Eppendorf-022667181-Rotor-Key-for-Microcentrifuge-Models-5415-D-5415-R-10mm-Socket-Wrench seems to indicate it's just a standard 10 mm socket wrench, so I bough one of those. (https://www.amazon.com/gp/product/B0028N57SW). I attempted to use the socket wrench on the hexagonal part in the centre (see the picture), but that just makes the whole rotor turn. I tried to keep the rotor in place while turning the wrench, but that didn't work either (I couldn't keep the rotor still).
If I try to lift the rotor upwards, the centrifuge hangs from it and I'm worried about damagaging it so I didn't try that very hard.

The centrifuge manual (http://www.nist.gov/ncnr/upload/Eppendorf_5415R_Centrifuge_Manual.pdf) doesn't go into detail about how to remove the motor. It mentions bending the rotor to one side if it's stuck, but how do I know if it's stuck in the way which is solved by doing that? 

What do I need to do?


Best regards,
JP

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