Introduction

Tool consisting of metal rod with conical point and it is used for making an indentation and to allow a punch make holes at same spot without slipping. There are different types of punches of which some of them are Centre punch, nail punch, pin punch, drill punch and prick punch etc. A punch press is designed specifically for the making of various shaped holes and coutouts on metal sheets and plate. The punches are fitted in punche press, also the dies of the size and ashape of the hole required. For irregular and non standard holes, the modem punch press is capable of nibbling. This refers to a series of successive its following a predetermined pattern that creates the cutout.

The punching action is accomplished by a vertical moving ram that forces the punch through the material and into a die through which the resulting slug is ejected. Additionally, a device to hold the material in place as a  punch is withdrawn , calls a stripper , and is often and integral part of the punch tool.