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

On Wed, Sep 20, 2017 at 11:38 PM, CPM <carlos.pendon@gm.uca.es> wrote:
> 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?
>
>

auto-translated by Google:
"""
Hello everyone
I have that problem too. Although the screw holding the rotor shaft of
the centrifuge rotor can not extarer. This is done with a tool called
"extractor". Extractors are of various types. One is as follows:
cylindrical part which at one end has external threads and is a hollow
or two centimeters from the center and the other carries a label to
thread the workpiece in the rotor. If you look, the rotor has a thread
surrounding the axis and tureca finished in a central ball that
fastens to the motor shaft. The nut can become loose and not out
because it has a washer that prevents it. But by loosening the nut is
left completely free. Well, that is to loosen the fixing nut slightly
without releasing all and thread extractor in the rotor until the
hollow portion thereof not exert force on the round head of the nut
(which is higher). Thus a reverse force sobe shaft downward and upward
on the rotor is it relieves. To release a bit, one or two millimeters
is enough. Then the extarctor desenrrosca, it ends loosening the lock
nut and the rotor is drawn upwards.
Estrus same can be achieved with an extractor handle the rotor by
three points in its outermost part and exert force on the motor shaft.

This is simple. but who have or where I can find that extarctor?
"""

Hmm, so you first need to know what kind of thread and what the
thread-to-thread pitch is. Then it sounds like a custom tool needs to
be machined. Or if one can be found, used, like on ebay... at least we
know what to look for.

:) thanks

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