One of the most important goals in the cutting process is to create an evenly distributed machining allowance for each tool in each process. This means that tools of different diameters (from large to small) must be used, especially in roughing and semi-finishing operations.
The main criteria at all times should be as close as possible to the final shape of the mold in each process, providing a uniform distribution of machining allowance for each tool, ensuring constant and high productivity and a safe cutting process.
When ap/ae (axial cutting depth/radial cutting depth) is constant, the cutting speed and feed rate can also be constantly maintained at a high level. In this way, the mechanical action and the workload change on the cutting edge are small, so that less heat and fatigue are generated, thereby increasing the tool life. If the latter process is a semi-finishing process, especially for all finishing processes, unmanned or partially unprocessed.
Constant material machining allowance is also the basic standard for high speed cutting applications. Another advantageous effect of a constant machining allowance is the small adverse effect on the machine tool, the guide rails, the ball screw and the spindle bearings.