Question

Mishandling of the ratchet of a screw gauge mainly causes which error​

Answer 1

To prevent damage to the pitch of the screw

Screw gauge is basically a screw with a constant pitch. It consists of a U-shaped piece of solid steel one arm of which carries a stud while the other arm, the spindle, carries a hollow cylinder within which an accurate screw having a plane face at its send, can move. The spindle is moved and adjusted using the thimble. The ratchet is provided at the end of the cylindrical tube. It acts as a limiting device which applies pressure by slipping at a predetermined torque, thereby preventing the spindle from moving further. As the pitch of the screw depends on the rotation of the spindle. The ratchet restricts the spindle from moving more than necessary, preventing damage to the pitch of the screw.