50 Subject to alterations
ENGINEERING
PROTRUSION BOX
Lateral protrusions beyond the cam unit work surface should generally be avoided - a wider cam unit is the better
choice in these application cases. If a lateral protrusion can not be avoided for certain reasons, the following aspects
must be ensured to guarantee the desired lifetime:
1. The total working force must not exceed the maximum permissible working force of the cam unit.
2. Asymmetrically arranged elements on the cam unit cause a shift of the centre of the force. The position of the centre of the force must be taken into account and adjusted with the permissible values
according to the force diagram.
3. In the case of multiple hole operations on free-form surfaces, it is generally assumed that the hole
punches enter the sheet at different times. Punches arranged eccentrically or in the protrusion of the
cam work surface require a particularly precise design.
The tool length on cam units also has a significant influence on the system load and the working result of the cam
unit. Long protrusions should be avoided whenever possible due to a weaker bending stiffness of the tools and a
large lever effect.