Henry J Garnaat

US Patent:

40808521, Mar 28, 1978

Filed:

Mar 7, 1977

Appl. No.:

5/775255

Inventors:

Allan J. Heffron - Freeland MI
Henry J. Garnaat - Jackson MI
Laverne H. Kennedy - Saginaw MI

Assignee:

CM Systems, Inc. - Bay City MI
Crankshaft Machine Co. - Jackson MI

International Classification:

B23B 300
B23B 518

US Classification:

82 1C

Abstract:

The invention pertains to the method and apparatus for machining crankshaft bearing and cheek surfaces wherein the cheek surfaces are turned by tungsten carbide tools in a dry-cutting operation and the bearing surface is turned by high-speed steel tools. The cheek and bearing machining is sequentially performed, the rate of crankshaft rotation and rate of tool movement during cheeking being considerably higher than during bearing machining, and the carbide and high speed tools are mounted upon a common tool carrier shiftable between two operative positions to permit the sequential turning operations to be rapidly sequentially performed during a single translation of the slide upon which the tools are mounted.