US Patent 7284332 Punch device and system comprising same

A hole center marking system comprises a punch device and an alignment member. The punch device includes a body assembly and a punch movably disposed within the body assembly. The body assembly has a circular cross-sectional exterior shape at a first end portion thereof. An indenting tip portion of the punch is forcibly biased to a position within the body assembly adjacent the first end portion of the body assembly. The alignment member has a central bore configured for having the first end portion of the body assembly engaged therein. The central bore of the alignment member is size to provide a close-tolerance fit between the central bore and the first end portion of the body assembly.