| COMPARISON BETWEEN PUNCHING FROM COIL AND STAMPING BY PRESS With these two technologies available, given the high cost of press tools, the aim is to determine the discriminant number of pieces N below which it is more economic to work with the coil punching machine. For production runs greater than N, it will be more economic make a special press die. Also in this case each of the factors making up the production cost will be analysed and the conclusions drawn. Raw material Both machines work from the coil and the raw material cost is therefore identical. Tools The cost of special press tools is higher than the cost of punch press tools, which are standard and may be reused in various productions. The cost of setup time is included in the tool cost; it is considered as being equal in the two machines and negligible compared to the cost of the special press tool. Hourly cost Both machines need the constant presence of an operator and the labour cost is therefore negligible. The annual maintenance and electricity costs are similar for the two machines. The cost of amortization of the two machines also here depends on the type of system. Basically the coil punching machine, with a slightly higher investment, offers great |