Accession Number : ADD006141

Title :   Hydraulic Drill Unit.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Phillips,Joseph L

Report Date : 05 Jun 1979

Pagination or Media Count : 26

Abstract : A hydraulic drill unit for drilling multimaterial, thick layer stock having a conventional hydraulic drill modified to have its feed controlled by a servo valve and its spindle speed controlled by a servo valve. A linear encoder is attached to the drill to provide an indication of drill position. The linear encoded provides 20,000 forward and reverse pulses per inch, depending upon the direction of travel, which are used to determine net feed rate. The net feed rate signal is compared with a command feed rate to control the feed servo valve. A magnetic pickup is used to provide a pulse signal proportional to RPM. This signal is compared with a command speed signal to control the spindle speed servo valve. Differential pressure transducers are used to measure pressure across the hydraulic feed piston and the hydrqulic drill motor to provide signals which can be used as indications of chip packing or a dull drill. Displays are provided to indicate Torque, Thrust, RMP, Inches of travel per revolution and relative displacement of the drill. These displays are used for the manual control of the drill. Torque, Thrust, RPM and absolute displacement information is supplied to computer for the automatic operation of the hydraulic drill.

Descriptors :   *Patents, *Drilling machines, Hydraulic equipment, Control systems, Electronic equipment

Subject Categories : Hydraulic and Pneumatic Equipment
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE