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New type of broaching system

The construction of mechanical parts, even simple ones, sometimes involves difficult problems that require, for their resolution, lengthy times or the use of special machines. The purpose of this article is to describe a system that can successfully help resolve such problems. -The typical case at issue is the manufacturing of blind hole keyways, splined interiors, or PTOs. In such circumstances, either you have a broaching or a slotting machine or you must send the semi-finished product to another company with all the consequent problems in terms of waste of time, loss of quality control and increased costs. Even if you have adequate machinery in place, there are always the difficulties related to the exact positioning of the work piece and the long processing times. The firm F.P. Officina Meccanica designed and patented a system consisting essentially of a special tool-holder, more specifically an insert-holder, and a number of inserts that can be used on numerical control machines such as CNC lathes, CNC machining centers, slotting machines, etc. This system is called “REV BROACHING TOOL” and allows performing the above works directly on the numerical control machines, which perform the afore-mentioned operations (turning, drilling, milling, etc.) without removing the work piece from the machine itself, with clear advantages in terms of machining times and accuracy. Actually, as it will be seen later, rather than broaching it would be better to refer to this process as necking. It differs from classical necking only in that the strokes are horizontal on lathes, while if this system is applied on a milling machine or a machining center with a vertical axis, then this operation becomes essentially a necking. However, several operations can be performed only through necking, therefore only with the system designed by F.P, such as all blind hole keyways, splined interiors or gear teeth. The typical insert-holder spindle is the one shown in picture No.1. The eccentric bushing is needed only if the CNC lathe does not have a Y-axis. In such case, the fitting is performed by properly maneuvering the eccentric bushing. On the other hand, if the lathe is provided with Y-axis, the eccentric bushing is not mounted and the CNC functions are used for fitting.