Machine for relief grinding tap threads
AssigneeReishauer AG
InventorEmil Vogelsanger
Life of this patent
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Abstract
A relief thread grinding machine for making screw taps wherein a workpiece 10 is clamped to a resiliently mounted body 5 of a longitudinally adjustable sled 1. The body carries a follower wheel 17 which bears on a cam roller 15 rotatably mounted on the sled. The surface of the cam roller is eccentrically lobed so that when it is axially moved varying oscillation strokes of the body 5 are produced. The cam roller can be axially adjusted as needed during the grinding process so that the amount of relief grind can be changed. In this manner it is possible to provide the conical thread on the lead end of a tap with a different relief grind than the generally cylindrical and posteriorly weak conical thread on the guide end of the tap.
Claims15
A relief grinding machine for cutting screw tap threads in a workpiece (10) mounted on a body (5) of a longitudinally movable sled, wherein means are provided on the sled for producing a stroking motion which transversely oscillates the body while the workpiece rotates and is moved by the sled past a transversely adjustable grinding disc (11), characterized by:
- the body (5) mounting a follower (17) which rides on the lobe curvatures of a cam roller (15) mounted on the sled (1), the roller axis being parallel to the direction of movement of the sled, the roller having a surface configured so that different cuts normal to the workpiece axis have varying profile depths, and the cam roller being axially adjustable and secureable to adjust the oscillating stroke of the body (5).
Dependencies are inferred from the claim text.