Abstract: An apparatus and method are provided for performing multiple machining operations on a workpiece such as a crankshaft. Oil holes may be drilled in a crankshaft by a tool shifted along a curved path between successive, acute angle tool plunging locations. The tool's carrier is shifted parallel to the crankshaft axis and the tool carrier is rotated to the desired acute angle about a point on the crankshaft axis for each of successive oil hole drilling locations thereby reducing programming needed to drill the oil holes at the specified angles. Offset tolerance errors are reduced by a large factor as the tool is plunged from an outer initial position toward the crankshaft axis.

Abstract: A method and apparatus are provided for rolling outer fillets of arcuately offset, split pin bearings on crankshafts with a pair of work rollers, each pair engaging and rolling a respective outer pin fillet. A backup roller is positioned opposite the pair of work rollers. The work rollers may be positioned above and below a centerline of the split pin, preferably about 90° apart. The work rollers can perform identical rolling operations at identical pressure and the work rollers and backup rollers are positioned to keep the adjacent tool heads in parallel planes during these rolling operations. Rolling arms carry the tool heads and stops are provided to keep rear portions of the tool arms in parallel planes against sideways forces. The work rollers and the backup roller may be mounted on the same tool arm and are movable relative to each to clamp or release a pin bearing.

Abstract: An apparatus and method are provided for roll hardening of crankshafts having split-pin bearings without requiring multiple rolling stages or operations therefor. The apparatus and method herein utilize a single tool unit that varies the rolling pressure on the fillets on either side of one of the split-pin bearings such that the areas needing strengthening are simultaneously rolled with a higher pressure than those areas at which bending of fence walls between adjacent bearings can occur with high pressure rolling, despite their arcuately offset orientation relative to each other. The tool unit has a pair of rollers rotatively housed at predetermined positions so that, when engaged against the opposite fillets of a bearing, they will be at arcuately offset or spaced positions from each other about the bearing.

Abstract: An apparatus and method are provided for roll hardening of crankshafts having split-pin bearings without requiring multiple rolling stages or operations therefor. The apparatus and method herein utilize a single tool unit that varies the rolling pressure on the fillets on either side of one of the split-pin bearings such that the areas needing strengthening are simultaneously rolled with a higher pressure than those areas at which bending of fence walls between adjacent bearings can occur with high pressure rolling, despite their arcuately offset orientation relative to each other. The tool unit has a pair of rollers rotatively housed at predetermined positions so that, when engaged against the opposite fillets of a bearing, they will be at arcuately offset or spaced positions from each other about the bearing.

Abstract: An apparatus for deep fillet rolling the undercut radii of crankshaft bearings, especially on a production scale basis. The apparatus is provided with increased versatility and flexibility for various engine crankshafts that may vary in number of pins and mains.

Abstract: In known deep-hole drilling machines, the undesirable situation arises, in the case of large drilling depths, that the boring bar, which becomes increasingly softer with increasing drilling depth, sags and starts to vibrate, so that the boring bar must be supported. This should, however, be possible at suitable spacings in the simplest possible manner and without interrupting the working process. For this purpose, it is envisaged that at least one guide bush for supporting the boring bar in a workpiece bore is provided on the boring bar, the guide bush being associated in a coaxial arrangement with a clamping ring of a ringe thickness which makes self-jamming tilting on the boring bar possible, and which clamping ring is pivotally coupled at one peripheral point to the guide bush to permit a small radial movement and has an external diameter smaller than that of the guide bush, and that at least one disengageable stopping device for a guide bush is provided within the coolant feed device.