Simple Google search for about 30 seconds will get that information
right from the horse's mouth, but....
Unfortunately the information has been removed from the Phillips
manufacturer website, recently
I'd like someone to come up with a CREDIBLE cite on that.
It appears to fall into the "urban legend" realm.
wrote in message
Mainly I can find references to more recent cross-slot designs being
intentionally designed not to cam out the Phillips do. That's more
recognition of how they work than it is backing up a claim of intent.
Phillip's patent certainly doesn't acknowledge the cam-out. It
suggests the design is more effective for high torque (and compared
with slotted drivers it is).
The only reference I see to camming action is the claim (about screw
and driver meeting):
This same angular formation of both elements is especially designed
to also create what might be termed a camming action during the
approach of these angular faces toward one another with respect to
any substances which might have become lodged within the recess of
He continues to claim that this action causes the driver to expell
any gunk that was in the screw.
Of course, high-torque cam-out may have been added in later refinements
to the design.
Drew Lawson While they all shake hands
and draw their lines in the sand
I'm with clare. I think the torque camout is a result of marketing
spin rather than design. When you spin it in and hit "tight", torque
causes a cross axial movement of the screwdriver, hence the "design
feature" camout. Tool user failure, not the design, is the key.
I dare someone to set up a real torque test of phillips screws and try
to prove design on this.
I have the consolation of having added nothing to my private fortune during
my public service, and of retiring with hands clean as they are empty.
-- Thomas Jefferson, letter to Count Diodati, 1807
Look in your phone book and see if you have a Fastenal store in your
area. Kinda like having a local McFeeleys. Here is a reference:
Don't limit yourself to square drive, how about Torx? Stainless?
On Sat, 21 Jan 2012 19:25:20 -0500, " email@example.com"
Both in my immediate area sell to anyone with money and carry a god
stock of the commoner stuff - and can order the esoteric stuff for
next day. Also lucky enough to have Spae-Naur/Kemsies virtually in my
back yard - with HUGE inventory of just about any fastener you could
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