25 Nov
2008
25 Nov
'08
6:45 p.m.
On Tue, 25 Nov 2008, Chuck Guzis wrote:
I once read an interview with the son of inventor
Henry Phillips (an
Oregon native) and he maintained that it wasn't the original design
(US Patent 2046343) that was at fault, it was primarily the fault of
ASC for cheapening the manufacturing process by relaxing
specifications--and the propagation of inferior tools. Indeed, the
screwdrivers I have that are labeled "Genuine Phillips" do seem to be
quite a bit better than the generic variety. One aspect of the
Phillips head not shared by Torx or Robertson/square is that it will
automatically center the driving bit.
I don't follow on the automatic centering. Yes, a slotted screwdriver can
slide out, but torx or robertsons?
The "slipping out", I believe is referred to
as "camming out".
While rebuilding a deck this summer, I found that even square-drive
screws are easy to strip when power is used to drive them.
That's why you're supposed to use a drill with a slipper clutch.
Fortunately, deck screws are being manufactured with
the Torx head
(mine were T25s) and allow for much better driving performance.
--
David Griffith
dgriffi at cs.csubak.edu
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