Punches A punch is a small diameter steel rod with a smaller diameter ground at one end. It is used to drive a pin out that is used to retain two components.
A punch used to drive pins from assembled components. This type of punch is also called a pin punch.
Punches are measured across the diameter of the machined end. Sizes include 1/16 inch, 1/8 inch, 3/16 inch, and 1/4 inch.
Chisels A chisel has a straight, sharp cutting end used for cutting off rivets or to separate two pieces of an assembly. The most common design for automotive service work is a cold chisel.
Safe Use of Punches and Chisels Always wear eye protection when using a punch or a chisel. Hardened steel is brittle and parts of the punch could fly off and cause serious personal injury.
Warning stamped in the side of a punch warning that goggles should be worn when using this tool. Always follow safety warnings.
Punches and chisels can also have the top rounded off, which is called “mushroomed.” This material must be ground off to help avoid the possibility that the overhanging material is loosened and becomes airborne during use.
Use a grinder or a file to remove the mushroom material on the end of a punch or chisel.
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