An assembly apparatus includes a retainer, a position measurement device, and a machining device. The retainer is configured to hold an assembly. The position measurement device is configured to measure a difference between an intended machining position and an actual machining position of a first coupling hole in a first assembly component. The first coupling hole is capable of being coupled to the assembly. The machining device is configured to form a second coupling hole capable of communicating with the first coupling hole in the assembly based on a reference position set on the assembly and the difference.

A board drilling apparatus, drill bit, and method for board drilling apparatus to drill a board. The board drilling apparatus (4) is configured to drill a board comprising at least a target conductive layer (13), an insulation layer, and a hole (3) covered with conductive material through at least part of the board in thickness, to remove at least part of the conductive material, the board drilling apparatus (4) comprising a drill bit (41) and a controller (43): the drill bit (41) comprising an insulation part (412) at least in center of end of the drill bit (41) and a conductive part (411) at least on edge of the end of the drill bit (41), arranged to enable only the insulation part (412) to be in touch with the conductive material of the hole (3) when the board drilling apparatus (4) is drilling the board, and arranged to enable the conductive part to get in touch with the target conductive layer (13) once the conductive material on the way to the target conductive layer (13) has just been removed; and the controller (43) configured to stop drilling when receiving an electrical signal occurred in response to the drill bit touching the target conductive layer of the board.

A board drilling apparatus, drill bit, and method for board drilling apparatus to drill a board. The board drilling apparatus (4) is configured to drill a board comprising at least a target conductive layer (13), an insulation layer, and a hole (3) covered with conductive material through at least part of the board in thickness, to remove at least part of the conductive material, the board drilling apparatus (4) comprising a drill bit (41) and a controller (43): the drill bit (41) comprising an insulation part (412) at least in center of end of the drill bit (41) and a conductive part (411) at least on edge of the end of the drill bit (41), arranged to enable only the insulation part (412) to be in touch with the conductive material of the hole (3) when the board drilling apparatus (4) is drilling the board, and arranged to enable the conductive part to get in touch with the target conductive layer (13) once the conductive material on the way to the target conductive layer (13) has just been removed; and the controller (43) configured to stop drilling when receiving an electrical signal occurred in response to the drill bit touching the target conductive layer of the board.

An apparatus for drilling out a plug of material, the apparatus comprising: a base plate having a top surface, a bottom surface, and a central longitudinal axis; a circumferentially-extending side wall extending distally from the top surface of the base plate, the circumferentially-extending side wall terminating in a circular distal end surface; a drill bit centered on the central longitudinal axis of the base plate and extending distally therefrom, the drill bit comprising a distal portion, a proximal portion and an intermediate portion extending between the distal portion and the proximal portion; wherein the intermediate portion of the drill bit comprises a first laterally-extending flat comprising a cutting edge disposed a first distance away from the central longitudinal axis towards the circumferentially-extending side wall and a second laterally-extending flat extending a second distance away from the central longitudinal axis towards the circumferentially-extending side wall, and further wherein the first distance is greater than the second distance.

An apparatus for drilling out a plug of material, the apparatus comprising: a base plate having a top surface, a bottom surface, and a central longitudinal axis; a circumferentially-extending side wall extending distally from the top surface of the base plate, the circumferentially-extending side wall terminating in a circular distal end surface; a drill bit centered on the central longitudinal axis of the base plate and extending distally therefrom, the drill bit comprising a distal portion, a proximal portion and an intermediate portion extending between the distal portion and the proximal portion; wherein the intermediate portion of the drill bit comprises a first laterally-extending flat comprising a cutting edge disposed a first distance away from the central longitudinal axis towards the circumferentially-extending side wall and a second laterally-extending flat extending a second distance away from the central longitudinal axis towards the circumferentially-extending side wall, and further wherein the first distance is greater than the second distance.

An apparatus for drilling out a plug of material, the apparatus comprising: a base plate having a top surface, a bottom surface, and a central longitudinal axis; a circumferentially-extending side wall extending distally from the top surface of the base plate, the circumferentially-extending side wall terminating in a circular distal end surface; a drill bit centered on the central longitudinal axis of the base plate and extending distally therefrom, the drill bit comprising a distal portion, a proximal portion and an intermediate portion extending between the distal portion and the proximal portion; wherein the intermediate portion of the drill bit comprises a first laterally-extending flat comprising a cutting edge disposed a first distance away from the central longitudinal axis towards the circumferentially-extending side wall and a second laterally-extending flat extending a second distance away from the central longitudinal axis towards the circumferentially-extending side wall, and further wherein the first distance is greater than the second distance.

An apparatus for drilling out a plug of material, the apparatus comprising: a base plate having a top surface, a bottom surface, and a central longitudinal axis; a circumferentially-extending side wall extending distally from the top surface of the base plate, the circumferentially-extending side wall terminating in a circular distal end surface; a drill bit centered on the central longitudinal axis of the base plate and extending distally therefrom, the drill bit comprising a distal portion, a proximal portion and an intermediate portion extending between the distal portion and the proximal portion; wherein the intermediate portion of the drill bit comprises a first laterally-extending flat comprising a cutting edge disposed a first distance away from the central longitudinal axis towards the circumferentially-extending side wall and a second laterally-extending flat extending a second distance away from the central longitudinal axis towards the circumferentially-extending side wall, and further wherein the first distance is greater than the second distance.

A method and apparatus. The apparatus comprises a first portion of a tool and a second portion of the tool. The first portion of the tool has a first surface. The first surface has a shape that is complementary to a first portion of a part. The second portion has at least one of a second surface configured to be recessed from a second portion of the part or a hollow portion.

The present invention belongs to the technical field of machining of fiber-reinforced composites, and relates to a method for measuring distribution of a thrust force during drilling of a unidirectional composite along with a fiber cutting angle. The method includes: cutting the surface a composite sample piece to form a groove; drilling on an existing experimental platform for measuring a thrust force during drilling, where a through hole obtained through the drilling is required to intersect with the groove; obtaining a curve of the thrust force during drilling, comparing the curve with a conventional curve of the thrust force to find a mutation point, and determining the mutation point, namely a fiber cutting angle at the groove; and calculating fluctuation periods of the thrust force according to machining parameters to reckon the distribution of the thrust force along with the fiber cutting angle in all the periods.