A tapping head configured to hold and drive different size taps with a slip joint that introduces a small amount of play bet ween the tap head and the tap to compensate for excessive lead that may damage the tap or the workpiece. The tapping head includes a base, a drive coupler, a drive sleeve, a driver, a clutch pack, a pressure ring, a clutch cover, a drive cover and a lock nut. The driver and drive sleeve are longitudinally coupled by splines that form a slip joint. The clutch pact includes discs that against the inside surface of the base and lower surface of the pressure ring. Mounted on the lower surface of the pressure ring are a plurality of clutch springs that force the pressure ring upward against the clutch pack. Disposed between the drive couple and the driver are thrust springs that exert downward forces on the driver. The clutch cover includes internal threads configured to attach to external threads formed on the base. By tightening the clutch cover on the base, the force exerted by the thrust springs on the pressure ring can be adjusted to change the amount of frictional forces exerted by the clutch pack.

The present invention discloses a tapping shank which mainly consists of axial, radial and deflection comprehensive floating mechanisms and a high-sensitivity rolling clutch safety mechanism. The present invention has an actual safety guarantee in tapping an M1 thread, solves the problems of axial pressure and tension of a main shaft on a screw tap, and eccentric and deflection errors between the screw tap and a bottom hole, ensures the precision of a hole diameter and a longest service life of the screw tap, and is also a high-precision hole machining floating reamer shank.

The present invention discloses a tapping shank which mainly consists of axial, radial and deflection comprehensive floating mechanisms and a high-sensitivity rolling clutch safety mechanism. The present invention has an actual safety guarantee in tapping an M1 thread, solves the problems of axial pressure and tension of a main shaft on a screw tap, and eccentric and deflection errors between the screw tap and a bottom hole, ensures the precision of a hole diameter and a longest service life of the screw tap, and is also a high-precision hole machining floating reamer shank.

A tapping head configured to hold and drive different size taps with a slip joint that introduces a small amount of play bet ween the tap head and the tap to compensate for excessive lead that may damage the tap or the workpiece. The tapping head includes a base, a drive coupler, a drive sleeve, a driver, a clutch pack, a pressure ring, a clutch cover, a drive cover and a lock nut. The driver and drive sleeve are longitudinally coupled by splines that form a slip joint. The clutch pact includes discs that against the inside surface of the base and lower surface of the pressure ring. Mounted on the lower surface of the pressure ring are a plurality of clutch springs that force the pressure ring upward against the clutch pack. Disposed between the drive couple and the driver are thrust springs that exert downward forces on the driver. The clutch cover includes internal threads configured to attach to external threads formed on the base. By tightening the clutch cover on the base, the force exerted by the thrust springs on the pressure ring can be adjusted to change the amount of frictional forces exerted by the clutch pack.

A quick-release adaptor for a tool for a torque limiter is provided. The quick-release adaptor has a housing having a first opening at a first end and a second opening at a second end. The first opening engages a drive shaft of the torque limiter to axially and rotationally connect the drive shaft to the housing. The second opening receives the tool. A groove is provided on an exterior of the housing between the first end and the second end. At least one through hole extends through the groove and into an interior of the housing. A ball bearing is seated within the through hole. A spring clamp is provided in the groove and extends over the ball bearing to exert a radially inward force on the ball bearing to seat the tool.

An adjustable chuck apparatus is provided with a torque limiting device; a torque transmitting mechanism; a chuck; a threaded fastener; a pin; a first positioning member including a threaded tunnel; a second positioning member including a threaded tunnel; a barbell shaped interconnection member including a first externally threaded section at one end and threadedly fastened in the threaded tunnel of the first positioning member, a second externally threaded section at the other end and threadedly fastened in the threaded tunnel of the second positioning member, a bar interconnected to the first externally threaded section and the second externally threaded section, and a hole element through the second externally threaded section; a truncated conic collet; and a cap. Each of different screw taps can be fastened by the apparatus by rotating a hand tool to adjust a distance between the first positioning member and the second positioning member.