The quiet of the forest is broken by the unmistakable snarl of a power saw. A lumberjack is using his most important tool.

The power saw has conquered many areas in past decades: it is indispensable for the felling of trees. It is also very useful when trimming branches.

Powerful and robust, reliable and light - these are the requirements which must be fulfilled by a power saw.

The bearings must also contribute to achieving an ergonomic design for power saws. These requirements include:

• low space requirements

• low mass

• high load carrying capacity.

During operation, the crank pin bearing is subjected to:

• uneven motion

• high centrifugal forces.

The piston pin bearing is subjected to:

• oscillating movements

• high accelerations