Browse Prior Art Database

Blind Hole Drilling (Adjustable Spindle Stop)

IP.com Disclosure Number: IPCOM000101626D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Burdick, RL: AUTHOR [+3]

Abstract

In present day technology, it is desirable to drill blind holes in printed circuit boards.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Blind Hole Drilling (Adjustable Spindle Stop)

       In present day technology, it is desirable to drill blind
holes in printed circuit boards.

      Disclosed is a mechanically adjustable device for drilling
various depth blind holes in printed circuit boards.

      The above is accomplished by adding a special Blind Hole
Pressure Foot 23 (see the figure) and a Drilling Spindle 20 attached
to a Beam 21 located over a Printed Circuit Board 22.

      When a blind hole is to be drilled, the Pressure Foot 23 is
driven down to the top surface of the Printed Circuit Board 22
(regardless of variance in board thickness) clamping it between the
Printed Circuit Board Fixture 29 and the front end of the Pressure
Foot 23.  The Spindle 20 is actuated down until Surface X of the
Spindle 20 comes in contact with Surface Y on the Adjustable Spindle
Stop 24.

      Various depths of holes can be drilled.  This is accomplished
by adjusting the adjustable Spindle Stop Ring 24 in relation to the
Pressure Foot 23.

      The depth of the hole to be drilled will be the difference
between Dimension "D" minus Dimension "E".  ("D" - "E" = depth of
drilled hole "F") (See the figure.)
   o    Dimension "D" equals distance from Surface X on Spindle 20 to
top of the Drill 30.
      o    Dimension "E" equals distance from stop surface Y located
on Adjustable Stop Ring 24 to front end of Pressure Foot 23.
      o    Dimension "F" equals protrusion of Drill 30...