Bernd wrote:
"Richard J Kinch" wrote in message
. ..

Jeff Wisnia writes:


My inquiring mind just asked me why the preponderance of threaded
fasteners, jar lids and stuff have right hand threads.

Most people are right-handed. More torque from a screwdriver tightening

in

that direction.


Depends if you hold the screw driver with the blade end away from the pinky
finger,
that would give more torque un-screwing. If the blade faces away from the
thumb, then
you have more torque tighting. Give it a try.

Sheesh Jeff, I must have more time on my hands then you actually trying this
out. G

Bernd



And, did you ever realize that you find a long bladed screwdriver is
easier to "get more torque from" than a stubby one, even if the handle
sizes are the same?

That's because you've got to keep the bit pretty well aligned with the
screw axis to prevent its camming out of a slot or Phillips head screw.

So, with a stubby driver, the torque has to come pretty much all from
twisting the handle, but with a long bladed screwdriver you tend to
unconciously move the handle off axis and create additional torque by
also pulling on the handle in a "cranking" fashion. That torque would be
applied even if the handle was free to rotate on the shank. (Think of a
"speeder" socket handle.)

The longer the blade, the greater crank arm you can get, for the same
amount of tolerable bit to slot misalignment.

Jeff

--
Jeff Wisnia (W1BSV + Brass Rat '57 EE)

"My luck is so bad that if I bought a cemetery, people would stop dying."