.... The backhammer may be mounted on the drill pipe joint between the borehole gripper and the swivel head, thus creating a combined effect of effective reverse impact and vibration. Sturdy and reliable, the backhammer is composed of three components and
.... The backhammer may be mounted on the drill pipe joint between the borehole gripper and the swivel head, thus creating a combined effect of effective reverse impact and vibration. Sturdy and reliable, the backhammer is composed of three components and more
