A screw has a pitch equal to 0.5 mm. What should be the number of division on its head so as to read correct up to 0.001mm with its help?

Pitch = 0.5 mm

L.C. = 0.001 mm

Substituting the values in the formula above we get,

0.001 mm = 0.5 / Total no. of div on the circular head

⇒ Total no. of div on the circular head = 0.5 / 0.001

⇒ Total no. of div on circular head = 500

Hence, the total number of divisions on the circular head = 500.