Threaded pilot allows machining of a port component, or boss, after the reciprocating hole has been threaded. It is used to align cutting surfaces with the boss threads, thus insuring precision alignment

Goldman, R.

Schneider, W. E.

English

NASA Technical Reports Server

Cutting Tool Squared End 
For Wrenching 
Threaded 
February 1966
	
Brief 66-10074 
NASA TECH BRIEF 
_____	 - _	 _ i 	 ------ -------	 -	 - -- _ -J -	 - --- - 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
ii-i	 --	 -	 - --------------------------
Threaded Pilot Insures Cutting Tool Alignment 
Cutting Edge
The problem: 
The standard practice in machining a port compo-
nent, or boss, requires that the hole be threaded after 
the piece has been first drilled and machined. The 
machined surface of the boss must be normal and 
concentric in relation to the threads. 
If the boss has to be reworked, an unusual amount 
of time and care are required to remachine and retain 
perfect threads. The reworking process results in 
many bosses being scrapped or replaced. 
The solution: 
A threaded pilot that is used to align cutting sur-
faces with the boss threads. This allows machining to 
be done after threading, and insures precision align-
ment. 
How it's done: 
After the boss is drilled and threaded, a threaded 
pilot is screwed into the boss and a cutting tool that 
fits over the threaded pilot shaft is used to machine 
the boss surfaces. The use of the threaded pilot 
keeps the machined surfaces normal and concentric
to the threads. For reworking a boss, the threaded 
pilot is screwed in, and the surfaces are machined in 
the same manner as that used for the original work. 
Notes: 
1. This device is recommended for use wherever pre-
cise alignment of port threads and boss face is 
required. 
2. Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 
Reference: B66-10074 
Patent status: 
No patent action is contemplated by NASA. 
Source: William E. Schneider and 
Reuben Goldman of 
North American Aviation, Inc. 
under contract to 
Marshall Space Flight Center 
(M-FS-527) 
Category 05 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000074 2020-03-11T17:34:22+00:00Z


Threaded pilot insures cutting tool alignment

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server