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A machine tool feed axis requires

  • A.accurate position control with rapid reversal
  • B.constant speed with no position feedback of any kind
  • C.the largest possible inertia to smooth the motion
  • D.one-quadrant operation in a single direction only

Answer: A

Following a programmed path to within microns means a position loop, a fine encoder and a low-inertia machine that can reverse quickly. Permanent magnet servo drives with ball screws or linear motors are the usual answer.

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