Linear Positioners Catalog_en-US_revA - Kollmorgen
Linear Positioners Catalog_en-US_revA - Kollmorgen
Linear Positioners Catalog_en-US_revA - Kollmorgen
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<strong>Linear</strong> Positioning: Mechanical Drive ComparisonL I N E A R P O S I T I O N E R SComm<strong>en</strong>tsLead: Sliding nut design provides quiet operation.Ball: Transmits audible noise as balls recirculate through nut during motion.Belt: the neopr<strong>en</strong>e cover of the belt provides damping of noise. The support bearings will g<strong>en</strong>erate some noise.Lead: Good for vertical applications; vibration may cause position loss.Ball: May require brake or holding device wh<strong>en</strong> no holding torque is applied to the screw.Belt: May require brake or holding device wh<strong>en</strong> no holding torque is applied to the drive pulley.Lead: Considered worn-out wh<strong>en</strong> backlash exceeds 0.020”. Typically 0.006” wh<strong>en</strong> shipped from the factory.Ball: Typically constant at 0.006” (lead screw/nut only).Belt: Typically at 0.010” wh<strong>en</strong> shipped. Can be adjusted to comp<strong>en</strong>sate for wear or stretching.Lead: Low duty cycle due to high friction from sliding surface design.Ball: High screw effici<strong>en</strong>cy and low friction allow high duty cycle.Belt: High effici<strong>en</strong>cy provides low heating and high duty cycle.Lead: Low effici<strong>en</strong>cy sliding friction surfaces.Ball: High effici<strong>en</strong>cy smooth rolling contact.Lead: Mechanical wear is a function of duty cycle, load and speed.Ball: Virtually no mechanical wear wh<strong>en</strong> operated within rated load specifications.Belt: High effici<strong>en</strong>cy contributes to long life. Drive belts can be easily replaced to ext<strong>en</strong>d system life.Lead: Better suited because of larger surface area.Ball: Brunelling of steel balls limits shock load capability.Belt: Shock loads can cause fatigue and stretching of drive belts.Lead: At extreme low speeds, units have a t<strong>en</strong>d<strong>en</strong>cy to stop/start stutter (due to friction).Ball: G<strong>en</strong>erally smoother than lead through the <strong>en</strong>tire speed range.Belt: 180° <strong>en</strong>gagem<strong>en</strong>t of belt provides continuous smooth contact throughout the speed range.Lead: Extreme speeds and accelerations can g<strong>en</strong>erate excessive heat and deform the screw.Belt: Each revolution of the drive pulley provides several inches of travel. Speeds up to 120 in/sec can be achieved.www.kollmorg<strong>en</strong>.com83
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