Frank M Turner

US Patent:

41231872, Oct 31, 1978

Filed:

May 5, 1976

Appl. No.:

5/683334

Inventors:

Frank W. Turner - Pleasant Ridge MI

International Classification:

B23B 2722
B23B 4718

US Classification:

408 17

Abstract:

A peck-drilling apparatus for quill feed units of the type having a frame member and a tool quill of the type adapted for reciprocative movement with respect to said frame member, together with the usual means to rapidly advance a tool toward a workpiece preparatory to performing a machining operation thereon, means to slowly advance the tool while said machining operation is taking place, and means to rapidly retract said tool at the conclusion of said machining operation, wherein a peck-drilling operation is accomplished by providing a plurality of cam mounting bars fixedly mounted to the tool quill parallel to the axis of reciprocation and having various cams mounted thereon, said cams adapted to operate limit switches fixedly mounted to frame member as they pass thereby. The limit switches, together with a timer, are connected to the various operating means to rapidly advance the tool quill to the workpiece, feed the tool quill at a slow rate of speed for a time interval preset on the timer, and then to rapidly retract the tool quill to its original starting position and there-upon to return it to where the tool just finished cutting previously and again feed the tool for the preset time interval, and to repeat this cycle until the desired depth of cut is reached.

US Patent:

39556298, May 11, 1976

Filed:

Nov 28, 1972

Appl. No.:

5/309957

Inventors:

Frank W. Turner - Pleasant Ridge MI

International Classification:

B23B 4720

US Classification:

173 19

Abstract:

This application discloses an improved quill feed unit of the type used in automatic or semi-automatic machines for holding and advancing the tool during the machining operation, wherein the rapid advance, feed, and rapid retract movements present in each machine cycle are performed entirely mechanically. Previously, substantially all of such guill feed units have been operated by the use of a hydraulic or pneumatic power, or a combination thereof, i. e. , a hydraulic or pneumatic cylinder would advance and retract the tool, while a suitable motor would rotate the tool. Despite efforts to solve them, severe problems were and are still encountered with these units. Problems such as leakage, poor start up, tool breakage and ease of tampering are commonplace. By the complete elimination of hydraulic fluid and air in Applicant's quill feed unit, the problem of start up of hydraulic units due to the thickening of the hydraulic fluid, when cold, are eliminated, as well as the problems of tool breakage, tampering, and leakage. In Applicant's invention, a single ball-screw assembly performs the rapid advance, feed, and rapid retract operations entirely mechanically without the use of fluids whatsoever.