4.0 mm Solid State NMR Rotor Cap Remover
One of the most challenging part of solid state NMR is to move the
end cap or base plug. This cap remover tool would assist you on this
- Completely unscrew the finger part of the tool relative to the
clamp part of the tool.
- Insert the rotor from the rear of the finger section of the
tool until the gap (if at all visible) between the rotor and the
cap is positioned under the fingers. Slightly depress the
fingers carefully until the gap can be ‘felt’ using your own
fingers to hold the rotor. Once the spot is clearly found apply
- pressure on the fingers of the tool until a ‘click’ is heard,
or you can actually see the cap move, or the gap widen or
appear. Some gaps are so small they are hardly if at all be
visible to the naked eye.
- Using a large scale magnifying glass may help here or a low
cost pair of low magnification reading glasses, even if you have
good sight, can help quite some.
- Remove the rotor, re-assemble the tool and re-insert the rotor
from either end so that the gap achieved in step II above is
just a little higher than the tips of the fingers as viewed from
the front. (See example in Front view picture.)
- Tighten the two thumb screws at the rear of the cap remover
fairly tightly. The rotor is then gripped by a specially
designed polymer sleeve to evenly distribute the clamping effect
over the rotor body.
- Grip the rear section in one hand and slowly rotate the front
section of the cap remover in a counter clockwise manner using
your other hand.
- Apply a little tension to the two fingers in the front to
‘feel’ the gap between the rotor body and either the turbine
blade cap as shown in this example or the base cap plug which
can just as easily be removed. The gap can still be very small
and can hardly be seen with the naked eye on either cap or
- base plug, but it should now be quite easily ‘felt’ with
something as sharp as the semi spherical blades on the end of
the cap remover fingers
- Once you are certain the cap remover fingers are indeed in the
gap you can now increment the force on the fingers of the cap
remover to the point where the fingers in the tool are back in
the gap between the cap (or base plug) and rotor, so you can now
‘unscrew’ the cap from the rotor under total control
- and at exactly zero degrees relative to each other. Viewed
another way you are holding the cap and unscrewing the rotor
from the cap. All things are relative.
|Fits Rotor with O.D. (mm):