Drilling fixture

Details Drilling fixture Drilling fixture

B - Operations, Transporting

27

C

77/10

B27C 3/00 (2006.01) B23B 47/28 (2006.01)

Patent

CA 1190772

DRILLING FIXTURE Abstract of the Disclosure A drilling fixture for drilling either cylindrical or flat workpieces on or off center is disclosed. The fixture includes a base having a V-shaped groove for receiving larger cylindrical workpieces, a pair of smaller V-shaped openings in the side walls of the base for receiving smaller cylindrical workpieces, a cover attached to the base, and a rotatable, indexable drill bushing mounted to the cover. The larger and smaller V-shaped grooves intersect at a common workpiece center- line drilling point. Thumbscrews are provided to clamp the workpieces in the grooves. The drill bushing includes a series of different size drill guide holes spaced about the circumfer- ence of the bushing on a common radius for receiving predeter- mined drill bit diameters to guide the drill bits along their longitudinal axes during a drilling operation. The bushing has intersecting planar side faces and vertical edges which engage a raised indexing and locking block on the cover for locating and positively locking the bushing in place for the drilling opera- tion. V-shaped stepped inserts can be mounted in the larger V-shaped groove in the base to allow for drilling of common sizes of channel steel, angle iron, and similar structural shapes.

420065

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