Abstract: A method includes following steps. A washer and a nut are removed from a threaded rod of an expansion bolt that is secured to a drilled hole. After removing the washer and the nut, foot of a semiconductor processing apparatus is removed from the threaded rod. The washer and the nut are placed back to the threaded rod of the expansion bolt. A lifting fork of a bolt lifter is moved such that fingers of the lifting fork are located directly below the washer. The lifting fork is lifted, by using a hydraulic cylinder, to extract the washer, the nut, and the threaded rod of the expansion bolt away from the drilled hole.

Abstract: A circuit board structure is provided. The circuit board structure includes a core substrate, two inner substrates, at least one groove structure, at least one thru-hole, and a plating layer. The core substrate includes two side surfaces opposite two each other. The two inner substrates are laminated on the two side surfaces of the core substrate. The at least one groove structure is formed between the core substrate and one of the inner substrates. The at least one groove structure includes two lateral grooves facing toward each other. The at least one thru-hole penetrates through the two inner substrates and the core substrate. The two lateral grooves of the at least one groove structure are arranged at two sides of the at least one thru-hole. The plating layer is formed on an inner side wall of the thru-hole. The plating layer has a plurality of plating gaps.

Abstract: A method for producing a circuit board structure includes an ink layer forming process implemented by forming an ink layer on a side surface of a core substrate; a laminating process implemented by laminating two inner substrates onto the two side surfaces of the core substrate; a thru-hole forming process implemented by forming a thru-hole that penetrates through the two inner substrates, the ink layer, and the core substrate; an activating process implemented by forming an activation layer covering an inner side wall of the thru-hole and the ink layer; an ink removing process implemented by removing the ink layer and portions of the activation layer covering the ink layer in the thru-hole; and a plating process implemented by performing a plating operation to replace the activation layer that remains on the inner side wall of the thru-hole with a plating layer to form a circuit board structure.

Abstract: A machine tool is provided with a bit-changing apparatus including a cam, a rocker, a roller, a linkage, a pulling element, a disc and clips. The cam is attached to the machine tool. The roller is attached to the rocker and movable against the cam. The linkage includes two connecting rods each formed with an end pivotally connected to the machine tool and another end pivotally connected to the rocker. The pulling element is provided between the rocker and the machine tool so that the roller is kept against the cam. The disc is rotationally supported on the rocker. Each of the clips is attached to the disc and used to clip a holder for holding a bit so that a selected bit can be engaged with a bit-driving unit of the machine tool.

Abstract: A machine tool is provided with a bit-changing apparatus including a cam, a rocker, a roller, a linkage, a pulling element, a disc and clips. The cam is attached to the machine tool. The roller is attached to the rocker and movable against the cam. The linkage includes at least one track attached to the machine tool, a sliding element attached to another end of the rocker and movable on the track, and a connecting rod formed with an end pivotally connected to the machine tool and another end pivotally connected to the rocker. The pulling element is provided between the rocker and the machine tool so that the roller is kept against the cam. The disc is rotationally supported on the rocker. Each of the clips is attached to the disc and used to clip a holder for holding a bit so that a selected bit can be engaged with a bit-driving unit of the machine tool.

Abstract: A chain-type bit-storing apparatus is provided for a CNC machine tool. The chain-type bit-storing apparatus includes a chain engaged with sprockets rotationally provided thereon. The chain includes links each includes a frame, a rotator rotationally connected to the frame, a pin for pivotally connecting the frame thereof to the rotator of another link and a socket connected to the frame and used to receive a bit. There is a pivoting unit for pivoting a selected one of the bits by pivoting a related one of the links.

Abstract: A tool support device for a machine tool includes a housing disposed beside a tool spindle, a tool storage rack having a shaft rotatably attached to the housing, a plate secured to the shaft and rotatably received in the housing, a number of rollers disposed on the plate, an axle rotatably disposed in the housing and having a rotary member which includes a helical groove for engaging with the rollers and for rotating the plate and the shaft and the tool storage rack relative to the tool spindle, the tool support device includes a compact structure for suitably shielding and protecting the tool support device and for preventing the tool support device from being contaminated and damaged by dirt and cut chips.