Center Punch

Center punch is also layout instrument made up of tool steel where both ends are hardened and tempered. It is similar as that of prick punch but only difference being that it has an included point angle of 90°. It is employed to mark the work-piece before drilling. It is usually used to enlarge the mark made by prick punch that is why drill may be started easily and accurately. Following points should be remembered when using prick or center punch:

(1) Hold the punch at an angle of 45° and place the point on layout line.

(2) Make sure that the point of punch should be sharp.

(3) Examine the position of the punch mark and correct it if essential.

(4) Bring the punch to a vertical position and tap it gently along with a light hammer.