Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1974-10-23
1976-04-13
Yost, Frank T.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
51165TP, 90 137, 318573, B23C 118
Patent
active
RE0287660
ABSTRACT:
The invention is directed to a novel apparatus for milling Swiss-type screw machine cams. The invention provides a highly simplified and economical numerically controlled system enabling Swiss-type screw machine cams and similar articles to be milled with an ease and precision heretofore unattainable otherwise than with highly sophisticated and costly equipment.
In its most typical application, the invention is utilized in the retro-fitting of an existing cutting machine, such as a shaping or milling machine apparatus of otherwise conventional construction. Alternatively, the invention can be applied in the first instance in connection with the manufacture of modified milling machines incorporating the new control system.
The system of the invention utilizes a conventional three axis cutting machine, such as a shaping or milling machine, which is fitted out with a rotary table. Numerically controlled stepping motors are provided for the "X" and "Y" axes of the [milling] machine, as well as for the rotary table. An otherwise conventional linear interpolator system, which is substantially self contained and commercially available, is connected between one of the linear axis stepping motors and the rotary table stepping motor. By appropriate control of the linear and rotary stepping motors through the linear interpolator, precise, continuous path cutting of involute cam curves is made possible. Such curves are widely utilized in cams for controlling the operation of Swiss-type screw machines, for effecting cutting tool movement at a constant linear speed.
For some Swiss-type screw machines, where the desired cam contour departs slightly from the true involute to accommodate the geometry of the tool supporting arms, the system of the invention provides for programming of the linear and rotary axes to move in the nominal involute relationship, and the "Z" axis of the machine is actuated by a simple mechanical device to introduce the necessary minor geometrical corrections.
The system of the invention provides a highly simplified and economical system for performing a complex [milling] cutting operation in the production of precision control cams for Swiss-type screw machines.
REFERENCES:
patent: 3154674 (1964-10-01), Tyzack et al.
patent: 3248624 (1966-04-01), Weber, Jr.
patent: 3609323 (1971-09-01), McDaniel
Bilinsky Z. R.
Yost Frank T.
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