Browse Prior Art Database

Machine Tool Production Monitor

IP.com Disclosure Number: IPCOM000073664D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Smelter, RE: AUTHOR

Abstract

Machine tool operation may be monitored by measuring the power, or current being utilized by the machine. An example of the current versus time curve 10 of a machine tool is shown. The output of the transducer sensing power or current is converted to digital data by a computer control system.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Machine Tool Production Monitor

Machine tool operation may be monitored by measuring the power, or current being utilized by the machine. An example of the current versus time curve 10 of a machine tool is shown. The output of the transducer sensing power or current is converted to digital data by a computer control system.

To monitor its operation. a threshold level 11 is first established by program. The control system can use a hardware comparator to compare the digital data with this threshold. If the current or voltage level exceeds this threshold, it indicates that the machine is cutting metal and a computer interrupt is initiated. At the time of the interrupt, the computer reads the time of the event from an interval timer. When the current or voltage level fails below the threshold level, another interrupt is generated and the timer again read. The difference between readings comprises the duration of the cut, which is compared to a standard to determine whether it was a valid cut. If valid, a piece counter is incremented.

1