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:
May. 20, 1997
Filed:
Oct. 31, 1994
Fanuc Ltd, Minamitsuru, JP;
Abstract
A method of monitoring machining load on a numerically controlled machine tool in such a way that incorrect judgment due to variations in machining load which are caused according to the machining conditions is made less frequent. The method is started by performing plural trial cutting operations. A signal indicating the machining load during these trial cutting operations is sampled and thus, sampling data is obtained. Reference data about the machining load and its variance are calculated from the sampling data and loaded in a reference data table. A threshold value according to variations in the sampling data is established, using the value of the variance. A load monitor means compares the reference data with data about the machining load obtained from actual measurements whenever each interval of time elapses. A decision is made as to whether the difference exceeds the threshold value. In this way, the machining load is monitored.