Accession Number:

AD0253676

Title:

AUTOMATIC FEEDRATE REGULATION IN NUMERICALLY CONTROLLED CONTOUR MILLING

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE ELECTRONIC SYSTEMS LAB

Personal Author(s):

Report Date:

1960-12-01

Pagination or Media Count:

1.0

Abstract:

The application of continuous path numerical control and tracer control to machine tools has increased the need for a more automatic and accurate method of feedrate selection. A method of using a feedback signal from the cutting process to determine the desired feedrate is presented as a solution to this problem. The choice of the proper feedback signal is first considered. It is shown that whereas a computer regulation system is best suited to controlling the metal removal rate, a feedback regulation system is best suited to controlling the tool wear rate. The tool temperature is known to be the output of the cutting process which is most closely related to the tool wear rate. The method chosen for detecting the tool temperature is the toolwork thermocouple technique. An experimental system for regulating the feedrate of the M.I.T. numerically controlled milling machine is described. The results show that subject to certain restrictions the tool-work thermal emf can be successfully fed back to control the machine feedrate so as to keep the cutting temperature essentially invariant to changes in the cross section of the cut. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE