TM5-3810-305-10Drums.Plain(Smooth)Installation of a wire rope on a plain (smooth)face drum requires a great deal of care. Thestarting position should be at the drum end sothat each turn of the rope will wind tightlyagainst the preceding turn (Figure 4-40). Closesupervision should be maintained all duringinstallation. This will insure the following:1. The rope will be properly attached to thedrum.USE RIGHT LAY ROPERIGHT LAY OVERWOUND3.4.Each turn will be guided as close to the pre-ceding turn as possible, so that there are nogaps between turns.There will beat least two dead turns on thedrum when the rope is fully unwound duringnormal operating cycles.By holding the right or left hand with indexfinger extended, palm up or palm down, theproper procedure for installing left and right layrope on a smooth drum can be easily determined.OVERWIND RIGHT TO LEFTUSE LEFT LAY ROPEUNDERWIND RIGHT TO LEFTUSE RIGHT LAY ROPELEFT LAY OVERWOUNDROPE ATFLANGELRIGHT LAY UNDERWOUNDFigure 4-40 Drum Winding and Appropriate Hand SignalsFlexibilityofWireRopeflexible fiber core rope. The reason for this liesThe term flexibility is frequently thought of asin the ability of IWRC rope to retain its round-being synonymous with resistance to bendingness and freedom of internal movement. Underfatigue. This is not true. Flexibility refers to thethe same conditions, a fiber core rope will flattencapability of flexing or bending. While a highand inhibit free internal adjustment, therebydegree of fatigue resistance may sometimesleading to early failure.accompany the flexibility characteristic, it doesnot necessarily follow that this is so. A fiberAs noted earlier, a design choice is almostcore rope, for example, is more flexible than aninvariably the result of compromise. Ultimately,IWRC rope. Yet, when the IWRC rope is bentwhat is sought is an efficient, economical solu-around undersize sheaves at relatively high loads,tion; hence, whatever the compromise, it mustit will usually perform better than the morehelp achieve this goal.4 - 42
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