Selection Chart for Shrink Disc

SPECIAL NOTE

dw : shaft size range ( min. - max. )
Mt : Max. transmissible torque
Pax : Max. transmissible thrust
Ta : Required tightening torque per locking screw
B : Size of locking screw

Tightening torques for Bolts

SELECTION PROCEDURE

Holdback Selection is based on its ID, OD, Width and Torque Rating. Minimum service factor 2 shall be considered.
T = kW x 9550 rpm
T = Torque
kW = Motor Power
rpm = Output Shaft Speed
Min. Service Factor = 2

INSTALLATION

1) The contact area for the Shrink Disc on the hub extension has to be cleaned and greased.
2) Distance pieces which have been used for shipping purpose only must be removed.
3) Do not tighten screws before the Shrink Disc is positioned on the hub extension.
4) Before the Shrink Disc and hub are positioned on the shaft, do not start to tighten the screws. Otherwise deformation may occur.
5) For easy positioning the contact surface of the shaft and hub (dia. dw) should be oiled. (On these surfaces no Mos2 should be used ).
6) Before final tightening of the screws both thrust rings should be squarely positioned by preloading the locking screws.
7) Finally the locking screws have to be tightened clockwise (not in a diametrically opposite sequence ). The screws have to be tightened two, three or more stages up to the indicated tightening torque Ta.

REMOVAL

1) For dismantling the screw should be released clockwise in several stages to avoid tilting of the thrust rings. Under no circumstance the locking screws should be taken out of the threads, as due to pre tensioning the Shrink Disc could jump apart.
2) The shaft can be taken out of the hub i.e the hub can be withdrawn from the shaft. For easier dismantling the shaft should be cleaned and oiled.
3) The Shrink Disc can now be removed from the hub extension.

CLEANING AND RE LUBRICATION

After having been in use Shrink Disc should dismantled and cleaned. The cones have been lubricated with greases containing MoS2 (e.g Molykote G Rapid). If the working surfaces are not damaged, they have to be re lubricated with Molykote BR 2. Also the screw ( threads and contact areas for the heads ) have to be lubricated with Molykote BR 2.