Screw Drive Types (was Re: Slotted Wood Screws)

[Isaac sur Noos]

The screw in Renner action is ¨Pozidriv, not Phillips.

Isaac



> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Don Gilmore
> Envoyé : vendredi 6 février 2004 21:17
> À : Pianotech
> Objet : Re: Screw Drive Types (was Re: Slotted Wood Screws)
>
>
> I have a very hard time believing these statistics.  Are
> you sure you read
> them correctly?  You can tighten a socket (Allen) head
> screw so tight you'll
> either break off the screw head or twist the wrench into a
> pretzle.  Socket
> head and hex head capscrews are used almost exclusively in
> building machines
> where torque is critical.  Torx heads are occasionally
> seen, but only on
> critical items such as bearing lock collars...we usually
> just replace them
> with socket heads since many maintenance crews don't have
> Torx wrenches.
>
> Ordinary machine screws (like slotted or Phillips head) are
> generally used
> only for mass-produced items where speed of installation
> and cost preclude
> strength or torque.  A Phillips (cross-recess) screw head
> will cam out
> and/or strip long before you get any serious torque out of it.
>
> Don A. Gilmore
> Mechanical Engineer
> Kansas City
> ----- Original Message -----
> From: "Phillip Ford" <fordpiano@earthlink.net>
> To: <pianotech@ptg.org>
> Sent: Friday, February 06, 2004 1:42 PM
> Subject: Screw Drive Types (was Re: Slotted Wood Screws)
>
>
> > In what way are they superior?  What's wrong with TORX?
> >
> > I have an article comparing torque that can be developed
> on fasteners with
> > various drive types using power drivers.  Interestingly,
> the Phillips is
> > about the same as the square drive.  The TORX can develop
> almost twice as
> > much as either one.  And the TORX PLUS slightly more.
> (Also interesting
> to
> > me is that the internal hex drive develops less than half
> the torque of
> > the Phillips or square drives).
> >
> > I can post scans of the article if anyone is interested.
> >
> > Phil Ford
> >
> >
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> >
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>
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