The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1998
Filed:
Sep. 22, 1995
Wayne K Finn, Torrance, CA (US);
Excellon Automation Company, Torrance, CA (US);
Abstract
In a system which interrupts the infeed signal generated by a CNC machine drive signals are applied to at least an RPM Control Electronics Module to drive the rotation of a cutting tool and the infeed drive motor electronics. A solid state relay intercepts the infeed signal and is driven into an on off state by a Variable Frequency Generator. This causes the solid state relay to enter the on off state in response to the input frequency and interrupts the infeed signal applied to the infeed motor electronics in synchronization with the frequency generated. The frequency is user selectable and the frequency used to eliminate or minimize chip formation is dependant upon the material being drilled, the infeed rate, the RPM of the tool, and the diameter and point geometry of the tool so adjustment by the machine operator is required. This permits the user to vary the specific frequency to select a frequency which is suitable for elimination of spirals in a given set of circumstances. The interrupted or chopped infeed signal causes the downward motion of the RPM motor to be interrupted in conformance with the frequency generated. Since the infeed rate of the cutter tool is also momentarily interrupted the tool penetration is interrupted. This process causes the cutting tool head to rotate without penetration and cuts the forming spiral chip.