A couling
half or pulley that is a push fit on the shaft can be pushed on by hand for
about half the length of the shaft extension. A special tool or a fully
threaded bolt, a nut and two flat pieces of metal are used to push it fully
home against the shoulder of the shaft.
If there is
no tapped hole in the end of the shaft, the coupling half can be heated to 80° C and pushed on to the shaft. If the coupling half is
machined for a tighter fit than and the push fit, it mush be heated to abaouth
150 ° C. the coupling halp is locked with an end plate. To remove
the coupling half, a puller is used.
It is bad
practice to use a lead mallet when fitting pulleys or couplings, and especially
bearings he harm that can be done by such treatment cannot be over emphasized.
It causes pitting of the receways in the bearing, and this damage increases in
service, leading to savere scaling. Statistics show that some 70 % of motor
faults are ue to bearing defects, and many of these can be traced back to
mistreatment during the mounting of a coupling or pulley.
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