Tap-starting guide

Abstract

Abstract This invention relates to tap-starting guides. The following improvements are included in the objects. This tap-starting guide is made of tough, hard material in the form of a rectangular block in which most of the cylindrical bores share the same space with other cylindrical bores, so the device is relatively light (one-half pound) and also very compact in size (1 1/4 X 1 1/2 X 2) with the capacity of containing 12 different sizes of cylindrical bores (0 to three-quarter diameter). The side opposite the side that contains nine cylindrical bores is a mirror image, therefore a left- or right-hand corner or edgetapping situation is accommodated simply by inverting the tap guide block. For easy and accurate manufacturing of the tap guide block, the intersecting cylindrical bores cross on center, and there is not a minimum to the flat work surface required to permit the use of the tap guide block. During the tap-starting period lubrication of the tap threads is achieved through the access of an intersecting horizontal cylindrical guide bore. After starting a tap the guide can be removed from the work surface without first removing the tap for large sizes or it may remain on the work surface for the full depth of the thread on very small sizes to act as a steady rest.

Inventors

• 👤 Frank A Wojcik

Bibliographic Details