Abstract: A boring machine used for a line boring bearing housings of an automotive engine block which provides for very secure mounting and precise operation by having rigidity built into the mounting table but yet is low cost, easy to fabricate, and readily adapted to a wide variety of different sizes of engine heads.

Abstract: A feed attachment for controlling the axial movement of a rotatable boring bar relative to a workpiece. The feed attachment includes a split clamp selectively secured to the boring bar for rotation with the boring bar about its axis. A collar is rotatably mounted concentrically with respect to the split clamp by a bearing which permits the collar to rotate about the axis independently of the boring bar and split clamp. A plate threadably engages the collar one one one side thereof and nonrotatably engages a workpiece on the other side thereof. The collar and plate are threadably engaged so that rotation of the collar moves the collar, base portion, and boring bar axially with respect to the plate and the workpiece. The plate is adaptable to nonrotatably engage workpieces of differing surface configurations.

Abstract: A preset indicator assembly has a dial indicator and a radially extending feeler post which can be preset to a desired diameter indication and used in a machine that is used for boring the bearing housings of an engine for quickly and accurately locating the center line of the bores prior to reboring the housings. The indicator is used in a method that provides setting the indicator very quickly, and also very quickly using the indicator for proper location of a head or block that is being worked on for reboring bearing bores. The bores may be either cam shaft bores or main bearing bores for the crank shaft of an engine.

Abstract: An apparatus and method for reconditioning cylinder heads and more particularly for permitting proper, quick, and easy alignment of the cylinder head relative to a machine for drilling and reaming valve guides for reconditioning the valve guides in the head. The method pertains particularly to orienting properly the axes of the valve guides to be reconditioned when the valve guides are canted at a compound angle with respect to the plane surface of the head, which is used for mounting the head onto a cylinder block.