On 2008-02-24, Joseph Gwinn wrote:
In article ,
clare at snyder.on.ca wrote:

[ ... ]

The mass of the wrench absorbs the "instantanious torque" or "impact".
Mean torque, or average torque, may be as little as 100-150 ft lbs and
still have a 1000 ft lb rating - without stretching things at all (or
very little)

OK, makes sense. Same theory as the traditional striking wrenches. But
the wrench must be pretty heavy to achieve such a number.

Another factor is that the "wrench" which is struck benefits
from being light, as long as it is sufficiently rigid. IIRC, these were
advertised as being titanium, which is light but rigid. So make the
part which is struck to transmit torque to the actual wrench socket as
light as possible (titanium), and the hammer part as massive as possible
(tungsten?) for maximum transfer of energy to the nut.

Enjoy,
DoN.

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