Using theoretical values to evaluate the power of hydraulic cutters may not be the right way to select them because theoretical figures don’t always correlate to real-life cutting power or performance.
By design, cutters generate their highest cutting forces right at the notch. That’s the reason the material to be cut has to be positioned as close as possible to the base of the blades. However, because of this very fact, theoretical cutting forces can be very misleading.
A theoretical force of 100 tonnes for example, will only be created right at the notch when the blades are completely closed and crossed over. When the blades are in this position, obviously no material can fit in-between the blades and hence cannot be cut, making the theoretical maximum force useless.
When cutting an A- or B-pillar in a vehicle, the material is initially crushed by the blades until the point of greatest resistance is reached and the actual cutting starts. This point is generally reached when the material in question has a diameter of around 4cm. This is where one needs the greatest force at the right point on the blade.
Lukas has completely re-designed their blade profile from scratch to maximise cutting force in the area where it is actually needed.
The extended Research & Development has resulted in the new S700 hydraulic cutter. While the maximum theoretical cutting force of the new cutter is not as high as the earlier version, the cutting force in the area where it is actually needed – around the 4cm diameter mark – is 77% higher.