Study of metal drilling solves problems of excessive burring, oversized holes, and out-of-round holes. Recommendations deal with using the proper chemical coolants, applying the coolants effectively, employing cutting oils, and dissipating the heat caused by drilling

Edmiston, W. B.

Harrison, H. W.

Morris, H. E.

English

NASA Technical Reports Server

December 1970
	 Brief 70-10594 
NASA TECH BRIEF 
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. 
Metal Drilling with Portable Hand Drills 
The problems of excessive burring, oversized holes, 
and out-of-round holes were among those studied 
during an investigation into the equipment and proce- 
dures used in drilling metals with portable hand drills. 
The study was aimed at defining the probable causes 
of such problems and recommending corrective meas-
ures. In the process, acceptable burr heights were also 
defined. 
In general, the conclusions and recommendations 
resulting from the study include guidelines for opera-
ting portable hand drills; specific instructions for 
drilling nonferrous metals, titanium and steel and 
their alloys, and aluminum and aluminum alloys; and 
recommendations to manufacturers for improving 
their equipment. 
Specifically, the study revealed that mechanical 
instability and vibration were major contributors to 
drill degradation and low quality holes. Furthermore, 
when spindle speeds were inadequate, chips entered 
and choked the flutes, and cut off the coolant flow to 
the cutting interface. 
One conclusion was that the clamping force on the 
metal piece to be drilled should be increased con-
siderably in order to reduce burr heights. Recom-
mendations deal with using the proper chemical cool-
ants, applying the coolants effectively, employing 
cutting oils, and dissipating the heat caused by drill-
ing. 
The results of this study have already been applied 
by portable hand drill manufacturers, and improved 
hand drills are now available. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
M arsh all Space Flight Center 
Code A&TS-TU 
Huntsville, Alabama 35812 
Reference: TSP70-10594 
Patent status: 
No patent action is contemplated by NASA. 
Source: H. W. Harrison, W. B. Edmiston, 
and H. E. Morris of 
The Boeing Company 
under contract to 
Marshall Space Flight Center 
(MFS-15 180) 
Category 08 
Amk 
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.
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Metal drilling with portable hand drills

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