Manufacture of punches and dies shaped in common patterns such as rounds, squares, or rectangle present no problem to the toolmaker. Standard punches and dies are available commercially in the smaller sizes and thus eliminate the necessity of making then in the majority of cases.
Installation is simply a matter of jig boring a hole pattern in the punch plate and a matching pattern in the die holder and inserting the purchased punches and dies.
when it comes to manufacturing punches and dies with shapes that are irregular and do not have true geometrical shapes .
before black-sawing method was used which was replaced by modern band-sawing techniques which save the toolmaker countless hours of manual work
