Adjustable drill bar incorporates a micrometer screw which, when used in conjunction with standard gage blocks, provides rapid method of drill hole location and reduces time and skill requirements for precision drilling on large surfaces. Device picks up oddly dimensioned tool hole points and acts as sine drill bar

Coventry, J. H.

English

NASA Technical Reports Server

December 1970
	 Brief 70-10547 
NASA TECH BRIEF
	
r ' G 
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 progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Adjustable Drill Bar Replaces Complex Jigs 
Figure 1. Previous Method 
The problem: 
To reduce the time and skill requirements for 
precision drilling on large surfaces. The complex jigs 
(see Figure 1) used in the past took appreciable time 
and put a premium on the skill of the setup man. 
The solution: 
An adjustable drill bar, shown in Figure 2, incor-
porates a micrometer screw which, when used in con-
junction with standard gage blocks, provides a rapid 
method of drill hole location.
How it's done: 
The desired hole pattern is obtained by making a 
drill plate from an engineering drawing. A three-hole, 
90' 10" increment grid is made, and the .stationary 
member is fastened to one side of this grid. The mem-
ber is held in place by the two hold-downs. The ma-
chined ways permit the movable member of the 
assembly to slide to any desired position within its 
range. By using an appropriate gage block, the selected 
drill hole in the movable member can be placed pre-
This document ssts prepared under the sponsorship of the NitionaI 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes an Liahilit resulting from the use ol 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=19700000529 2020-03-17T00:36:46+00:00Z
Hol Down
Stationary Member
Micrometer Screw 
Gage Block 
Moveable Men
Figure 2. Adjustable Drill Bar 
cisely on the workpiece using the micrometer screw.
	 Patent status: 
Notes:	 No patent action is contemplated by NASA. 
1. This device is versatile in picking up oddly di-
	
Source: John H. Coventry of 
mensioned tool hole points and acts as a sine drill
	
North American Rockwell Corp. 
bar,	 under contract to 
2. No additional documentation is available. Specific
	
Manned Spacecraft Center 
questions, however, may be directed to:
	 (MSC-15624)
Technology Utilization Officer 
Manned Spacecraft Center, Code BM7 
Houston, Texas 77058 
Reference: B70-10547 
Brief 70-10547 Category 07


Adjustable drill bar replaces complex jigs

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