In metalworking, a knockout punch, also known as a chassis punch, panel punch, Greenlee punch, or a Q-max,[1] is a hand tool used to punch a hole through sheet metal. It is a very simple tool that consists of a punch, die, and screw. There are three different drive systems: manual, ratchet, and hydraulic.[2]
- ^ Benchmark Media UK, Producing Sheet Metal Components and Assemblies, Benchmark Media Limited, p. 50.
- ^ Fournier, Sue (1990), Metal fabricator's handbook, HPBooks, p. 16, ISBN 978-0-89586-870-1.