ETP 120 pages

TAPPEX
THREAD INSERTS LIMITED
Masons Road
Stratford-upon-Avon
Warwickshire
CV37 9NT
Telephone: +44(0) 1789 206600
Fax: +44(0) 1789 414194
Email: sales@tappex.co.uk

ETP 12
(EXTERNAL TECHNICAL
PAPER NUMBER 12)
12.

TORQUE RELEASE PRODUCTION DRIVERS

12.1

TAPPEX PRODUCTION DRIVER FUNCTION AND DESCRIPTION.

Tappex Torque Release Production Drivers are designed for use with the Tappex
Flexiarm, tapping heads, portable air tools, or by hand when used in conjunction with a
Production Driver Alignment Bush (see ETP8). When used with torque controlled air
tools, the Production Driver functions in conjunction with a driving clutch inside the
installation equipment. The nose of the driver bottoms on the surface of the parent
material and builds up friction rotational resistance. The clutch is set to slip or actuate
reverse (dependant upon the use of manual or automatic equipment), releasing the
Production Driver from the installed insert. Consistent depth control on installation is
obtained by the insert engaging on the exposed threaded stud, and sealing against a
small reduced diameter step on the face of the driver nose. The step controls the depth
of installation slightly below the parent material surface. When the driver is used in
conjunction with tapping heads, whose forward motion is restrained at a depth stop rather
than at a set torque, a longer spigot on the nose caters for setting variations.

Tappex usually offers the Standard Diameter Regular Nose Length Production Driver but,
if installing inserts close to a wall, the smaller Reduced Diameter is suitable in most
applications. The Standard Diameter version should be utilised wherever possible, and
where inserts are being installed into very soft or very hard materials. This helps to
eliminate problems where the insert could back-out in very soft materials, or the
difference between driving torque and stripping torque is too close for setting purposes in
very hard materials. The standard version with a larger nose diameter ensures that when
the nose bottoms on the surface of a hard material, the difference between driving torque
and stripping torque is increased; In soft materials, sufficient friction is built up under the
nose to ensure that the outer shell of the driver remains stationary whilst the driving stud
rotates, breaking the friction lock between the driver nose and the insert.

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