[ROVERNET - UK] P6B nuts and bolts specs

[Gundry, Kenneth]

I don't understand Patrick's remark about Pozidrive.  I believe it is
the standard screw-head everywhere in the world except the US, and until
I moved from Britain to the US (working in design of electronic
equipment which certainly contained screws), I had in fact never heard
of Philips screw heads.  All my screwdrivers from the period were/are
Pozidrive.  As far as improvement is concerned, that depends on the
application.  I believe that Philips heads were developed for mass
production using electric or air screwdrivers; when you are doing up a
screw, you don't want to stall the screwdriver (at least, not those of
WWII vintage), so when the screw gets tight, the bit rides up out of the
head.  That is of course fine the first time during assembly, but makes
it much more difficult to undo the screw subsequently, or to do anything
with a normal hand-held screwdriver.  In contrast, Pozidrive
screw-driver bits, and of course the corresponding screw heads, have
straight parallel sides (no taper), so there is no tendency to ride out
and thus no need to apply downward force to hold the bit into the screw.
That is also very convenient for getting screws into inaccessible
places, since a screw will remain on the bit; Philips screws fall off
the bit.

Ken Gundry

-----Original Message-----
From: rovernet-bounces at lyris.ccdata.com
[mailto:rovernet-bounces at lyris.ccdata.com] On Behalf Of phing
Sent: Saturday, November 03, 2007 8:12 PM
To: rovernet at lyris.ccdata.com
Subject: Re: [ROVERNET - UK] P6B nuts and bolts specs

Vern
 Thanks . I've been hauling a Posidrive screwdriver around in my tool
box since 1972 ,. I knew I would need it one day . Posidrive was a
British GKN " improved Phillips" type screw head . It became a world
beater , just like Beta max and 8 track tapes !
Cheers
 patrick

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