Question

In NC machine, The stepper motor of X - axis is connected to a lead screw having double start screw threads of 4 mm pitch. If the specification of motor is 800 pulses/one revolution of motor, the positioning accuracy of the motor is

• A. $10\mu m$
• B. $5\mu m$
• C. $20\mu m$
• D. $5\mu m$

Answer 1

The correct option is A $10\mu m$

800 pulses = 1 rev of motor

= 1 rev of lead screw

= 2 $\times$ pitch of lead screw

= 2 $\times$ 4
= 8 mm