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GRUNDOMAT - The 2-stroke-method
        
The main feature of the GRUNDOMAT hammers P and N version) is the 2-stroke-method. In the first step, the piston strikes onto the chisel head assembly which is driven forward as the piston accelerates and impacts against the rearof the chisel. In a second step the piston strikes onto the casing pulling it into the previously created bore hole together with the pipe to be installed. That way the impact energy is concentrated onto the chisel so that ground resistance at the chisel head is overcome, leading to high single stroke impactenergy, high directional stability, reduction of the soil friction and high boring speed. The N version has an additional forward gear and a new crowned head.