Advanced aerospace drill motor

摘要

A method of drilling and a drill motor are provided for use with a stationary template attached to a material to be drilled. The drill motor has a frame having a handgrip and surrounding a movable carriage or motor assembly. The motor assembly contains an air-powered motor for rotating a drill bit. At least two air cylinders are located in the motor assembly on opposite sides of the drilling axis and are used to move the motor assembly within the frame. The force that can be applied to move the motor assembly is adjusted by adjusting the airflow to the cylinders. Hydraulic restrictions control the maximum speed at which the motor assembly moves. An auto-return valve and adjustable pin provide means for automatically returning the motor assembly to its rearward position once a desired drilling depth has been reached. Controls are provided at the grip for operating the feed system and manually retracting the motor assembly.