Triangular cutting tool uses carbide tips for notching heat-treated or abrasive materials, and alloys subjected to high structural stresses. The tool is rigidly mounted in a slot of mating contour to prevent deflection during cutting of tensile specimens. No other expensive machine equipment is required

Spier, R. A.

English

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I I 
Detail-
October 1970
	 Brief 70-10411 
NASA	 H 
NASA Tech Briefs announce new technology derived from the U .S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Vee-Notch Tool Cuts Specimens 
The problem:	 cutting operation. Since no expensive machine equip-
To design a vee-notch cutting tool for use on tensile
	
ment is required, the tool can be mounted on a stand 
specimens that would cost less and be easier to set up
	 or table and operated by laboratory technicians.

than any existing equipment for that purpose. Also a How it's done: 
higher degree of precision could be achieved than
	 The tool is hollow ground on the end, allowing all 
that obtainable by conventional methods.
	 three edges to be used prior lo resharpening. Since 
The solution:	 neither the carriage nor the cutter can be deflected, 
A triangular cutting tool, rigidly mounted in a slot
	 uniformity of the vee-notch position is positive in 
of mating contour to prevent deflection during the
	 relation to the holes. In addition, spring collets are 
(continued overleaf) 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned.rights.
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provided for positioning of the specimen from the 
existing holes. This precise positioning eliminates 
any misalignment of the opposed notches due to 
variation of tolerance in the hole size. A rocker, activ-
ated by an electrically driven bellcrank (not shown) 
causes the triple edged cutter to oscillate up and down. 
Simultaniously, turning the carriage adjustment wheel 
moves the specimen against the cutter blade. The geo-
metry of the cutter provides for the application of 
carbide tips when used in notching heat-treated or 
abrasive materials, or exotic alloys contemplated for 
use in structures subjected to high stresses. Further-
more, the tool can be adapted to other types of notch-
ing and/or light duty punching of holes or slots.
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Code A&TS-TtJ 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: TSP70-1041 I 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
-Source: Raymond A. Spier

Marshall Space Flight Center

(M FS-20730) 
Brief 70-10411	 Category 06


Vee-notch tool cuts specimens

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