ETP 12
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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 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. ‘ETP 12’ - Page 1 of 4 ©Tappex Thread Inserts Ltd 2001. All Rights Reserved

Tappex offer three variations on nose length (dimension C) for each size of driver. The short nose length version is designed for use in high torque applications. Regular nose length drivers are recommended for general applications with long nose length drivers usually required for deep access applications. These three variants are then available with hexagon or square shanks and standard or depth control spigots. Production Drivers for torque controlled clutches are driven using a ¼” A/F hexagon shank, with the option of a 5/16” A/F hexagon for larger sized M8 and M10 drivers. Production...

THREAD SIZE SHORT NOSE LENGTH (029A, 029B, 029C) SQUARE SHANK A/F SQUARE SUGGESTED STOCK REQUIREMENTS The number of spare parts stocked for each type of Production Driver will vary, dependant upon the likely wear rate, equipment use and the conditions of insert installation. A hard material with a high installation or stall torque is more likely to wear driving studs due to friction, and thrust races due to axial loading. The table below offers an indication for initial stocking:Monthly usage KEY TO SPARE PARTS : DS – Driver Stud TR – Thrust Race PD – Production Drivers ‘ETP 12’ - Page 3 of...

Note : When ordering spare studs and thrust races, and part numbers are not known, quote Production Driver part number. For new projects, the Installation Tool Kit (ITK) is recommended. This provides a set of spares for ongoing production Installation Tool Kits consist of 1 off Production Driver, 3 off spare studs and 1 off spare thrust race. Order by specifying ITK/insert part number/-01/-01P (if required). TROUBLE SHOOTING The following remedies should be made if any of the below problems or symptoms are experienced with the installation of Tappex inserts using a Tappex Production Driver....