On Tuesday, August 11, 2015 at 5:56:21 AM UTC-7, jloomis wrote:
Torque Drive. The better drive.
I was not thrilled with the first part of the video that showed the screw
driver being held sideways.
Either way though, phillips are tough screws to use

Yeah, the driver-not-straight was a jarring note. If one uses a mixture
of bits (Philips #1, Philips #2, Pozidrive, JIS, Reed and Prince, ...) for
crosspoint screws, it's inevitable that the heads will get damaged (and the
tips as well) because mismatch of shapes makes for excessive
stress and deforms the metal.

If one always uses the correct screwdriver tip, there's less damage, until
someone wags the screwdriver axis around. With the correct tip, and good
seating and alignment, (i.e. operator skill), heads don't get damaged and
tips last a long time.

Torx, Robertson, Bristol spline, and Allen socket screws are better because they
keep the bit on-axis; Bristol spline has the lowest stress on its driving surfaces
(because of the shape - driving faces are nearly parallel to radius), with Torx
close behind. Torx is apparently easily mass-produced.

This tip design probably has some kind of 'tooth' (structure or texture) that
keeps the tip seated, and purports to substitute for operator skill and allow
reuse of damaged fasteners. I'm not interested in that - it's probably better to
use standard tip designs, hone skills, and discard damaged fasteners. As for
removing recalcitrant fasteners... it's just another sometimes-it-might-work
gimmick. *yawn*