Replacement of opposing smooth rollers with appropriately grooved rollers in manual tubing cutter allows smooth severance of tubing of different diameters and eliminates raised lip around cut end

Giandomenico, A.

English

NASA Technical Reports Server

1972	 B72-10095 
NASA TECH BRIEF 
NASA Pasadena Office	
-4 
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 National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Tubing Cutter 
The problem: 
Tools which sever tubing by means of a cutter 
wheel often leave a small raised lip around the cut 
end; the lip must be removed before the tubing can 
be inserted into a close-fitting hole. A manual tubing 
cutter was needed to cut tubing of different dia-
meters and leave a smooth edge. 
itter Wheel
cutting wheel are replaced with grooved rollers 
shaped as indicated in the lower part of the diagram. 
The sharp-edged cutting wheel shown in the upper 
part of the diagram raises a lip on the periphery of 
tubing because the cutting action forces the tubing-
wall material to the sides of the cut. When the 
cutting action begins, the small lip is cleared by the 
roller groove, because the groove is wider than the 
initial cut, but as the cut becomes wider and the lip 
height increases, the edges of the groove in the roller 
bear down on the lip and prevent it from rising. Just 
before the tubing is severed, the width of the cut 
equals the width of the roller groove (as indicated 
in the lower part of the diagram) and the smoothing 
action is complete. 
Note: 
Requests for further information may be di-
rected to: 
Tube
Technology Utilization Officer 
NASA Pasadena Office 
Grooved Roller	 4800 Oak Grove Drive 
Pasadena, California 91103 
Reference: TSP72-10095 
The solution: 
Replace the opposing smooth rollers which are 
ordinarily used in tubing cutters with appropriately 
grooved rollers. 
How it's done: 
The two smooth, opposing rollers ordinarily used 
in tubing cutters which use a third sharp-edged.
Patent status: 
No patent action is contemplated by NASA. 
Source: Anthony Giandomenico of
Caltech/JPL
under contract to
NASA Pasadena Office 
(NPO-11524) 
Category 07 
.
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.
https://ntrs.nasa.gov/search.jsp?R=19720000095 2020-03-17T03:25:10+00:00Z


Tubing cutter

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