I don't know whether it's really true or not, but that seems to be the
Phillips drive tool and fastener sizes Tool size Fastener size
Created by Henry F. Phillips, the Phillips screw drive was purposely
designed to cam out when the screw stalled, to prevent the fastener
damaging the work or the head, instead damaging the driver. This was
caused by the relative difficulty in building torque limiting into the
The American Screw Company was responsible for devising a means of
manufacturing the screw, and successfully patented and licensed their
method; other screw makers of the 1930s dismissed the Phillips concept
because it calls for a relatively complex recessed socket shape in the
head of the screw as distinct from the simple milled slot of a
slotted type screw.
There are five relatively common (and two rather uncommon) Phillips
drive sizes that are different from the screw size; they are
designated 000, 00, 0, 1, 2, 3, and 4 (increasing in size).
Maybe. But the patent
which is reference by the wiki article doesn't claim the "cam out" feature.
The biggest single "consumer" of Philips screws and bits is the
"drywall" industry. Many of these drivers seem to use "cam out" to
On Mon, 18 Jul 2011 23:47:58 -0400, John Gilmer
No, they use a specially designed driver that sets the "depth" of the
screw. When that depth is reached, the "clutch" disengages - not a
"cam-out" function at all. Otherwize you could just use a drill with a
$0.99 philips bit to hang drywall.
Not at all. A clutch head driver:
They make 'em fer electric/air/hand powered tools for many different
I don't know about setting depth. That's pretty much the function of
the screw length. But, definitely will disengage the bit when screw
bottoms out and/or reaches a specific torque setting. My first
experience was with an air clutch head driver for self-tapping
hex/flange sheet metal screws. Suckers would drive into 1/8" steel
like soft butter, then the bit would disengage when bottomed out.
Some people are humor and irony impaired, they often don't know when
you're pulling their leg. I run into it a lot with my Evangelical
Southern Baptist cousins, Liberal Leftist Commiecrat Freaks and um,
....(me ducks behind immovable object)......er,.......... women. :-)
I have them all in my family. One of my cousins on my father's branch of
the tree is a fairly well known Southern Baptist evangelist. He once
asked my mother if she was in The Mafia because Mom is from The Italian
side of the family. I even have Jewish cousins which is why I consider
everyone to my cousin.
It was developed to reduce assembly time on mass production assembly
lines. The worker with driver tool only requires a quarter turn to
align for engagement instead of up to a half turn. A phillips
fastener is also self centering. This not to say phillips fasteners
can't cam out, but so can straight slot fasteners. If the proper tool
is used, there's no reason for a phillips fasteners to cam out.
Here's the DAGS you obviously didn't do.
The only thing that's "as usual" is your resorting to name calling when
you have no information to contribute.
Which is more of "the story" than you provided, which is none at all.
In fact, why do you even post to this group? It's obvious you know
almost nothing about almost everything.
nutjob (for even responding)
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.