One wrong statement in my posting yesterday: If the force is not parallel
to the spanner, the torque on the bolt is not necessarily increased above
the torque wrench set point - it may decrease, depending on the direction of
the force. If the force is directed inwards toward the spanner/bolt, the
torque on the bolt is less than the set point when it clicks. If directed
outwards, the torque is higher. So, just keep it parallel to the spanner!
Regards,
Svein
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Fra: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] P vegne av Sidsel & Svein
Johnsen
Sendt: 17. april 2009 19:53
Til: europa-list@matronics.com
Emne: RE: Europa-List: Re: Europa-List: propeller torque
<sidsel.svein@oslo.online.no>
Actually, the torque wrench may be at any angle to the spanner - it "clicks"
only when the bending moment at the end (= torque) reaches the set point.
The bending moment transferred to the spanner (ref. my sketch yesterday) is
then equal to that set point. The important point is that the force applied
by your hand at the torque wrench handle MUST ALWAYS BE PARALLELL TO THE
SPANNER, ALSO IF THE TWO TOOLS ARE AT 90 DEGREES. If not, your force causes
an additional bending moment in the spanner and thus an additional torque on
the prop bolt. The reason for recommending (and drawing) the spanner and
the torque wrench at 90 degrees angle is that the natural direction of your
hand's force on the handle is also 90 degrees, i.e. less risk that you
forget to apply the force parallel to the spanner.
If the torque wrench is not 90 degrees to the spanner, more force (PARALLEL
TO THE SPANNER!) must be applied to the torque wrench to reach the set
point, but the torque at the prop bolt is still equal to the set point when
the torque wrench "clicks".
Regards,
Svein
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