Device for ending the feed movement of a grinding wheel

Details Device for ending the feed movement of a grinding wheel Device for ending the feed movement of a grinding wheel

1975-05-07

1976-09-07

Whitehead, Harold D.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

B24B 4910

Patent

active

039786242

ABSTRACT:
Means for terminating the infeed of a machine tool, particularly a grinder. An electrode is imbedded within the tool and is exposed at the active surface thereof, such as the grinding surface of a grinder, and a sensing voltage is placed between said electrode and the workpiece. Suitable switching means is placed within the circuit of said electrode and workpiece which switching means will be activated upon the occurrence of a spark between said electrode and the workpiece. Activation of said switching means then activates further means to terminate the infeed of the tool. The circuitry supplying the voltage aforesaid may include a transformer having a plurality of output taps by which a plurality of voltages may be applied between the electrode and the workpiece and such circuitry will in such case include switching means automatically responsive to said different selected voltages. Thus, one voltage may be utilized at a first distance for terminating a rapid infeed, the occurrence of a spark at such distance then terminating the rapid feed, imposing a second and lesser voltage between the tool and the workpiece, and activating a creep feed and finally activating a switch sensitive to such second voltage which, when a second selected distance is reached, may be utilized to stop the power feed entirely.

REFERENCES:
patent: 2256120 (1941-09-01), Lovenston
patent: 2961394 (1960-11-01), Williams et al.

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