Attachment for machine tools provides a visual indication of the depth of cut and a positive stop to prevent overcutting. This attachment is used with drill presses, vertical milling machines, and jig borers

Laverty, J. L.

English

NASA Technical Reports Server

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April 1966	 Brief 66-10149 
NASA TECH BRIEF 
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. 
Depth Indicator and Stop Aid Machining to Precise Tolerances 
The problem: 
With many drill presses, vertical milling machines, 
and jig borers, it is difficult to consistently hold depths 
of cut to close tolerances. 
The solution: 
An attachment that provides the machine with a 
visual indication of the depth of cut and also provides 
a positive stop to prevent overcutting. 
How it's done: 
The attachment consists of a split-ring bracket 
(shown attached to a drill-press spindle quill) that
attaches to the machine and mounts a travel dial 
indicator at one end and adjustable stop bar at the 
other. The rod holding the travel dial indicator is 
positioned so that the indicator will contact a refer-
ence surface. With the cutting tool mounted in the 
spindle, the quill and spindle are lowered until the 
tool reaches the precise depth of cut desired. The 
travel dial indicator is engaged with the reference 
surface and set to zero. The stop rod is then set to 
engage the workpiece, fixture, or press bed at the 
depth of cut. The tool, spindle, and quill are retracted 
and the workpiece put in place.
(continued overleaf) 
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=19660000148 2020-03-11T17:29:47+00:00Z
Notes: 
1. With this attachment, an operator can make re-
peated cuts to precise depth by observing the travel 
dial indicator for a zero indication. 
2. Inquiries concerning this innovation may be di-
rected to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 
Reference: B66-10149
Patent status: 
No patent action is contemplated by NASA. 
Source: John L. Laverty 
of North American Aviation, Inc. 
under contract to 
Marshall Space Flight Center 
(M-FS -553) 
Brief 66-10149	 Category 05


Depth indicator and stop aid machining to precise tolerances

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