Browse Prior Art Database

Self Centering Hole-Location Gauge Unit

IP.com Disclosure Number: IPCOM000106198D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 79K

Publishing Venue

IBM

Related People

Hernolf, B: AUTHOR

Abstract

Disclosed is a fast and inexpensive way of measuring the linear position of a mass produced hole, difficult to access and often blind to inspection by conventional measuring methods. It eliminates an extra set up of the part being measured. The hole position within a tolerance zone can be located unseen and its position measured precisely.

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Self Centering Hole-Location Gauge Unit

      Disclosed is a fast and inexpensive way of measuring the linear
position of a mass produced hole, difficult to access and often blind
to inspection by conventional measuring methods.  It eliminates an
extra set up of the part being measured.  The hole position within a
tolerance zone can be located unseen and its position measured
precisely.

      Two embodiments are described for differing requirements.  The
first (Fig. 1) is for measuring the position of cylindrical holes,
cones, chamfers, threaded holes, with a square or cylindrical
tolerance zone.  Measurement is made against an outer point on a
steel ball the diameter of which limits probing height.  The second
embodiment (Fig. 2) also measures the position of cylindrical holes
with square or cylindrical tolerance zone; measurement is not limited
to a ball diameter but is made to any point against the diameter of a
vertical rod which remains perpendicular (YY) regardless of lateral
(XX) tolerance movement.  Both embodiments allow small probes to be
attached, or to be the probe of a measuring machine.  When the object
is placed in the fixture the gauge automatically centres on the hole
to be checked.

      An embodiment is shown in Fig. 1.  A hole (1) to be located and
accurately measured for position in an object (2) is presented to
gauge unit (3) held in an inspection fixture (4).  Projecting from
the gauge unit (3) is a sprung loaded plunger with a concave seating
(5) projecting through a clearance hole (6) in the top of gauge unit
(3).  Plunger and concave seating (5) is prevented from passing
outside hole (6) by underside washer (7).  Coil spring (8) is
compressed...