Six keys to achieving better precision in linear motion control applications

6 keys to precision

Challenge:

Understand the six keys to achieving better precision in linear motion control applications

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Key Insights & Considerations:

  • Travel accuracy – minimizing system pitch, yaw or roll depends on the quality of the travel guidance system and the surface to which it is mounted. Factors in the bearing circulation can also cause precision-reducing vibration.
  • Positioning accuracy – depends on tolerances of the drive element. For ball screws, there can be significant lead-error or lead-deviation within the ball screw or ball nut. The degree of error often depends on the method used to create the screw threads. Further accuracy can be gained with electronic correction in the machine.
  • System/machine frame stiffness – an unstable frame often reduces the efficiency of the finest control system.
  • Operational speed – critical speed and characteristic speed should be addressed to reduce vibration and other influencing factors.
  • Thermal considerations – all linear motion components will generate heat that must be taken into account.
  • Machine resonance – don’t forget that nearby machines or even forklifts can be a source of vibration.