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US Patent: 3,988,560
Method and Apparatus for Controlling Generation of Machining Pulses in EDM Power Supply
Patentees:
Jerry Earl Losey (exact or similar names) - Fort Thomas, Campbell County, KY
John Richard Witzel (exact or similar names) - Milford, Hamilton County, OH
Harry Dean Kauffman (exact or similar names) - Cincinnati, Hamilton County, OH

USPTO Classifications:
219/69.13, 219/69.17, 219/69.18

Tool Categories:
metalworking machines : electrical discharge machining
metalworking machines : machine tool controls

Assignees:
Cincinnati Milacron, Inc. - Cincinnati, Hamilton County, OH

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 29, 1975
Granted: Oct. 26, 1976

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Cincinnati Milacron, Inc.
Description:
Abstract:

In an EDM process, a method and apparatus are disclosed for determining the quality of a machining gap by detecting a voltage signal across the gap in response to a low power pulse applied immediately prior to a machining pulse. Upon detecting a first predetermined number of consecutive inferior gap voltage signals in response to corresponding low power pulses the application of low power pulses and machining pulses is terminated for a predetermined period of time. Thereafter, only the low power pulses are applied to the machining gap; and after detecting a second predetermined number of consecutive good gap voltage signals in response to corresponding low power pulses, the machining pulses are reapplied.

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