US 4,062,255 AGranted

Center turning tool

OwnerJohn J. Perotti, George O. Pangburninventors

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Abstract

A center turning tool usable with a machinist lathe and insertable in the tailstock thereof. This tool may be used by the improved method of leaving the workpiece set up of the lathe as is and with the addition of this tool perform the cutting or reforming of a proper center in the workpiece. This center reforming tool includes a main support structure having a movable and accurately adjustable keyed toolfinger therein for supporting a toolbit removably held in place thereon. Accurately threaded adjustment structure is provided for the movable toolfinger together with appropriate handle mechanism for making fine accurate movements of the toolfinger structure and toolbit held thereby. A keyway and associated guide pin prevent the toolfinger from revolving within the main support as the toolfinger is moved in and out thereof. The pin is also adjustable to eliminate any sloppiness or movement of the toolfinger and to apply proper tension thereto. The main body is also provided with a tapered or straight arm for supporting same in the tailstock and/or chuck of a lathe.

Claims4

Dependent claims

A center turning tool for use with a machinist lathe and the like comprising:

means provided so that the tool can be used to recut and reform a damaged center of a workpiece held in the lathe without disturbing the compound tool rest of the lathe and the workpiece including;
a main support structure fittable removably into the adjustable tailstock of the lathe, an adjustable tool holder mounted at a predetermined angle on the main support structure by means of an accurately drilled aperture in the main support structure, the adjustable tool holder being a close fit within said aperture, an elongated longitudinal keyway provided in the outer circumference of said tool holder, an adjusting screw mounted in the tool holder perpendicular to the aperture and the keyway of the tool holder and extending into said keyway to prevent rotation of the tool holder relative to said aperture in the main support structure, a workpiece center cutting tool held in said adjustable tool holder, and means for accurately adjusting the toolholder, the adjusting means including a stud having fine accurate threads provided thereon for engagement with complementary threads within an aperture provided in the adjustable tool holder.

Dependencies are inferred from the claim text.