Direction: In the feed drive of a Point-to-Point open loop CNC drive, a stepper motor rotating at 200 steps/rev drives a table through a gear box and lead screw-nut mechanism (pitch = 4 mm, number of starts = 1). The gear ratio
 | = |  | is given by | |
| Input rotationalspeed |
U = 1/4. The 1 stepper motor (driven by voltage pulses from a pulse. The frequency of the pulse train from the pulse generator is f = 10,000 pulses per minute.
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Which type of motor is NOT used in axis or spindle drives of CNC machine tools?
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- induction motor
- dc servo motor
- stepper motor
- linear servo motor
Correct Option: B
| Step angle (α) = | = 1.8 | |
| 200 |
| α = | = 1.8 | |
| 200 |
| x = | , A αnp | |
| 360 |
np is number of pulse.
np = 1 for BLU
| x = | × Gear Ratio | |
| 360 |
| x = | × | ||
| 360 | 4 |
x = 5 microns
