Abstract: A magnetic drill press includes a main housing, a base coupled to the main housing and including a magnet for selectively magnetically latching to a ferromagnetic workpiece. The magnetic drill press further includes a drill unit supported by the main housing for relative movement therewith in a direction of a rotational axis of the drill unit, a spindle assembly operable to selectively position the drill unit relative to the main housing, and a handle assembly. The handle assembly is removably coupled to the spindle assembly without the use of tools, for driving the spindle assembly.

Abstract: A drilling/tapping/unscrewing apparatus including a transmission shaft of a power source on which a drilling ratio gear, a tapping ratio gear and an unscrewing ratio gear are mounted for transmitting the power of the power source to a bit. The apparatus further includes an adjustment unit for controlling the switching between the drilling, tapping and unscrewing operations of the apparatus. The adjustment mechanism includes a bit shaft on which a drilling gear, a tapping gear and an unscrewing gear are fitted. The tapping gear and the unscrewing gear are respectively engaged with the tapping ratio gear and the unscrewing ratio gear. The drilling gear and the tapping gear are controlled by an adjustment button to synchronously move up and down on the bit shaft, whereby the drilling gear can be engaged with or disengaged from the drilling ratio gear.

Abstract: A tapping attachment for driving a tapping spindle constructed to be adapted for both direct drive and reverse drive of the spindle. The drive of the spindle is by way of a resiliently mounted dog ring having rigid radially extending drive dogs, extending radially outwardly and inwardly from a drive ring. The driving dogs are rigid, having slanting sides to accommodate clutching engagement and disengagement. Clutching engagement and disengagement occur as a result of relative axial movement as between the attachment and the drive spindle. The drive spindle has a central bore in which is provided an insert member having an axial bore which is connected to a flexible tube within the bore of the spindle, which accommodates relative axial movement, the flexible tube communicating with a similar bore in a tap itself. These bores provide a channel for continuously supplying coolant to the machine and to the spindle itself.

Abstract: An internal thread forming apparatus includes a housing body fixed on a machine tool, a driving spindle connected to the rotatable main shaft of the machine tool and rotatable at the same speed as that of the main shaft, a movable body movable vertically within the housing body, a rotary lever actuatable to move the movable body downward, and a first return spring biasing the rotary lever to return to a static position. A positive-revolution driving body and a reverse-revolution driving body are carried on and are movable synchronously with the movable body, and rotate in opposite directions. A speed reduction gearing interconnects the driving spindle and the face gears so as to rotate the face gears at a speed less than that of the driving spindle. An output spindle is mounted slidably within the movable body. A tap is fastened to the output spindle. A driving block is carried on the output spindle.

Abstract: Dismountable machining apparatus for use at different work site locations, and having base means releasably attachable to a workpiece, and having a collar including an opening having a predetermined central axis and having attachment means, drive housing means connecting releasably with the attachment means, and defining a central opening in registration with said central opening of said portions, so that the drive housing means may be assembled and disassembled from said base member at a work site, drive sleeve means in the drive housing incorporating a central bore, drive transmission means for the drive sleeve means, and adapted to be coupled to a power source for driving the drive sleeve, an auxiliary drive connected to the drive sleeve, and driven in unison therewith, a machining bar member slidably received within the drive sleeve whereby the machining bar member may be rotatably driven by the drive sleeve, and may be axially slid therein, and being releasable, a feed housing and a feed sleeve member fo

Abstract: This disclosure relates to a tool holder including a driving cylinder, a driven cylinder reciprocatable and rotatable within the driving cylinder and attachable with a tool, first threaded means reciprocatable and rotatable together with the driven cylinder and having the same pitch as that of said tool, and second threaded means in threading engagement with the first threaded means and rotatable relative to and engageable with part of the driving cylinder to stop axial movement away from a workpiece and adapted to prevent its rotation relative to said first threaded means, such that the rotation of said first threaded means forces the tool to be advanced accurately with the same pitch as that of the tool.

Abstract: A tapping attachment for a machine having at least one rotating workpiece spindle and associated coaxial tool drive shaft. The tapping attachment couples a tapping tool to the drive shaft in a manner selectively controlling the tool to rotate with respect to a workpiece attached at one of two predetermined velocities in the same direction as the spindle. The attachment is selectively adapted so that one of the two velocities is above and the other below that of the spindle.

Abstract: This application discloses an improved quill feed unit of the type used in automatic or semi-automatic machines for holding and advancing the tool during the machining operation, wherein the rapid advance, feed, and rapid retract movements present in each machine cycle are performed entirely mechanically.Previously, substantially all of such guill feed units have been operated by the use of a hydraulic or pneumatic power, or a combination thereof, i.e., a hydraulic or pneumatic cylinder would advance and retract the tool, while a suitable motor would rotate the tool.Despite efforts to solve them, severe problems were and are still encountered with these units. Problems such as leakage, poor start up, tool breakage and ease of tampering are commonplace.