Method and apparatus for modifying the position of a machine sli

Turning – Process of turning

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Details

82 2B, 82 5, 318571, B23B 100, B23B 546

Patent

active

040967700

ABSTRACT:
On a machine having a cutting tool moving relative to a rotating workpiece, a method and apparatus are disclosed for holding a constant relationship between the cutting tool and an angular position of the workpiece for different velocities of the cutting tool which produce correspondingly different following errors. The invention is applicable to a numerically controlled turning machine of the type maintaining a constant initial contact point between the cutting tool and an angular position of a rotating workpiece in response to a constant following error during successive machining passes. A first machining pass is executed in response to a first velocity signal which causes the cutting tool to initially contact the rotating workpiece at a first angular position thereof. Before the execution of a subsequent machining pass, the velocity signals associated with the first and subsequent machining passes are used to calculate the difference in following errors between machining passes. The cutting tool is moved through a displacement corresponding to the difference in following errors after which the subsequent machining pass is executed. By changing the starting point of the subsequent machining pass as a function of the difference in following errors, the cutting tool in executing the subsequent machining pass will initially contact the rotating workpiece at the first angular position of the workpiece defined by the first machining pass.

REFERENCES:
patent: 3381557 (1968-05-01), Dunn
patent: 3595106 (1971-07-01), Pomella et al.
patent: 3725651 (1973-04-01), Cutler
patent: 3817129 (1974-06-01), Nishimura et al.
patent: 3949285 (1976-04-01), Rosshirt
patent: 3987350 (1976-10-01), Pomella et al.

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