Laserfiche WebLink
' L D1RECTDRIVE <br />-, a. .All units must be realigned prior to start-up. <br /> b. Alignment must be checked with the unit at operating temperature. Ambient (room) tem- <br /> perature alignme nt does not allow fur the unit's thermal growth, and neglect of this will <br /> result in misalignment, excessive vibration, and shortened bearing life. (NOTE: Lack of <br /> vibration at start-up does not necessarily indicate perfect alignment.) <br /> e. For coupling and driver, follow manufacturer's installation and lubrication instructions. <br /> 1'he basic uhjuctive in coupling alignment is to obtain a common axis of rotation for the <br /> driver and the driven iuember when Operating equilibrium conditiuus exist. <br /> d. When both are rotating together and connected through a eolnnlon coupling, the unit will <br />' rotate f reely without excessive vibration. A common axis of rotation requires that there be <br /> no parallel or angular misalignment between the two shaf ts. <br />' 2. BELT DRIVE I <br /> Aligning a belt d rive is much simpler than aligning a direct coupled drive. To check align- <br /> ment, place a it ratght edge across the fates of the driving, .end driven sheat es. If properly <br /> aligned, tlLe strai,,bl edge will contact both sheave faces squarely. <br /> lil�W�l.r.i.'.i.l.1. .J""_ <br /> -- — <br /> Perfect Alignment Angular Misalignment Parallel Misalignment <br /> 3. BELT TENSION <br /> It is very important that belted drives receive regular inspections for proper tension, espe- <br /> cially a fete days after the initial installation. Belts which are too tight will result in exces- <br /> sive bearing stresses, and belts that are nut tight enuubh will slip and fail preusaturely. Belts <br /> under proper tension will have it live, springy feel when thumped with the hand and will <br /> carry heavier loads with longer life. <br /> When replacing;belts in a multiple set, ALL belts should be replaced with a new matched <br /> set. New belts should also be increased by approximately 2 lbs. to allow for stretching, and <br /> then rechecked after S hours run-in. <br /> 1 Sheaves should be mounted as close to bearings as possible to minimize overhung load. <br /> Belt tension can be checked as follows: Divide the unsupported belt length by 64 to arrive <br /> at a deflection dimension. The belts should have approximately 5-7# tension at this def lec- <br /> 1 tion. Belt manufacturers can provide a tool to check this. <br /> 0 0 <br /> 1 <br /> Bell Tension Check <br /> 1 <br /> 1 <br />