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View Full Version : Re: Summary: max. torque with a screwdriver



unknown user
05-20-1998, 05:02 AM
Dear subscribers,

I apologize for writing in Italian my reply to Viceconti's plea.
Since I believe nobody in the summary wrote something similar to what I
pointed out, I feel that I owe him a translation to those (if they
exist!) who are interested in this topic (besides Viceconti, who's
italian mother tongue).

TRANSLATION (as good as I can)

By experience, I know that the maximum torque which I can apply with
my hand
on a handle of a screwdriver in ideal conditions (e.g the tip of the
screwdriver is stiffly attached to a rigid body which makes impossible
for the screwdriver to rotate) is much less than the max torque I can
exert on the same screwdriver in REAL conditions. In fact, usually the
screwdriver has to be pushed quite strongly toward the screw to prevent
it from slipping out of the screw head. I feel that the intensity of
this push force is never enough to allow maximum torque. In other words,
the screwdriver slips out of the screw head before you can reach the max
theoretical torque.
I also pointed out that this does not happen if the screwdriver has
a tip type which we call "brugola" (my english dictionary doesn't have
this word). The "brugola" tip has a flat hexagonal end and an hexagonal
transverse section. Of course, the screw has to have a suited hole on
its head.


__________Paolo de LEVA____________ Tel.+ FAX: (39-6) 575.40.81
Ist. Superiore di Educazione Fisica other FAX: (39-6) 360.03.199
Biomechanics Laboratory
P. Lauro De Bosis, 6 INTERNET e-mail address:
00194 ROME - ITALY Pa.deLeva@Agora.STM.IT


__________Paolo de LEVA____________ Tel.+ FAX: (39-6) 575.40.81
Ist. Superiore di Educazione Fisica other FAX: (39-6) 360.03.199
Biomechanics Laboratory
P. Lauro De Bosis, 6 INTERNET e-mail address:
00194 ROME - ITALY Pa.deLeva@Agora.STM.IT

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