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The screw is then threaded into the punch and the screw tightened until the punch is drawn completely through the sheet metal. [2] The manual system uses a screw that has a standard hex head or square head and is driven using an allen key or wrench. A manual knockout punch can handle holes from 0.5 to 1.25 in (13 to 32 mm).
Greenlee is an American industrial and electrical tool company headquartered in Rockford, Illinois.It was founded in 1862 by twin brothers Robert L. and Ralph S. Greenlee to manufacture their invention called a hollow chisel mortiser, consisting of a drill surrounded by four chisel blades used in making mortises (the hole) for mortise and tenon joints, for the furniture industry in Rockford. [1]
William Augustus Greenlee (December 26, 1893 – July 7, 1952) was an American businessman in Pittsburgh, Pennsylvania, who was born and raised in Marion, North Carolina. After migrating to Pittsburgh as a young man and working in the steel industry, he started to acquire his own businesses.
In boxing, a straight or cross (also commonly called a rear hand punch) [1] are punches usually thrown with the dominant hand and are power punches like the uppercut and hook. Compubox , a computerized punch scoring system, counts the straight and cross as power punches.
Knockout, an American film about a female boxer; Knock Out, an Indian Hindi-language action-thriller film; Knockout or Born to Fight, a Canadian film; Haywire or Knockout, a 2011 American film; Knockout, a 1977–78 NBC series hosted by Arte Johnson; Knockout (Indonesian TV series), a game show
The heart of the 024 and 026 keypunches was a set of twelve precision punches, one per card row, each with an actuator of relatively high power. Punch cards were stepped across the punch one column at a time, and the appropriate punches were activated to create the holes, resulting in a distinctive "chunk, chunk" sound as columns were punched.