An improved apparatus for repairing broken mounting holes in engines, such as broken exhaust manifold mounting holes, is disclosed. The adjustable template can be readily mounted to different components on different types of engines and provides adjustable carriages that allow for the precise alignment of bushing and various repair tools to facilitate repair of broken mounting holes.

A machining tool assembly is provided for machining a blank to form a firearm lower receiver. The assembly includes a pair of side plates positionable on opposed sides of the blank to capture the blank therebetween. A template plate having a template aperture is adapted to be removeably attachable to the side plates. The template aperture is aligned with a top surface of the blank and is adapted for machining a cavity within the blank having a peripheral contour complimentary to a peripheral contour of the template aperture. A centering mechanism is adapted to be removeably attachable to the template plate, with the centering mechanism including an opening aligned with a corresponding void formed on the blank to align the blank with the template plate.

An improved apparatus for repairing broken mounting holes in engines, such as broken exhaust manifold mounting holes, is disclosed. The adjustable template can be readily mounted to different components on different types of engines and provides adjustable carriages that allow for the precise alignment of bushing and various repair tools to facilitate repair of broken mounting holes.

According to one implementation, a rotary cutting tool includes: a body without a back taper; and a cutting edge part integrated with the body. The body has a flow path of a cutting oil inside the body. The cutting edge part has a first supply port that supplies the cutting oil toward a workpiece. The body has at least one second supply port that supplies the cutting oil to a clearance formed between a bush for positioning and the body. The bush is used by being inserted in the body.

An orbital drill bushing adapter for use with a drill unit. In one embodiment, the orbital drill bushing adapter comprises a main body and locking arms. The main body includes a base member having an upper surface, a lower surface, and an external side wall that extends between the upper surface and the lower surface. The main body further includes a cylindrical spacer that projects from the lower surface of the base member, and is configured to fit in a drill hole of an orbital drill bushing. The main body includes a cylindrical hole that passes through the base member and the cylindrical spacer. The locking arms are pivotally coupled to the base member, and are configured to clamp the main body onto the orbital drill bushing.

A device for securely attaching a drilling device to a drill plate provided with a plurality of positioning bores. The attachment to the drill plate including an expandable collet with balls.

According to one implementation, a drill includes: a body without a back taper and a cutting edge part. The body has a flow path of a cutting oil. The flow path is branched to first and second flow paths inside the body. The cutting edge part has a first supply port that supplies the cutting oil toward a workpiece. The first supply port is an outlet of the first flow path. The body has a second supply port that supplies the cutting oil to a clearance between the body and a bush for positioning the body. The second supply port is an outlet of the second flow path. The second flow path has a pressure loss by which the cutting oil is not scattered from the second supply port in a radial direction of the body but exuded from the second supply port.

The method of locating hole features so that old components can be replaced with new components and still match fit with the airframe includes the steps of adhering a bushing assembly into a fixture plate, rigidly attaching the fixture plate with the bushing assembly to the old component, heating the liquid metal above the liquid metal melting temperature such that the cylindrical drill bushing can move within the assembly, inserting an alignment pin within the cylindrical drill bushing such that the alignment pin is also inserted into an existing hole in the old component and the airframe, allowing the liquid metal to re-solidify; removing the alignment pin from the old component, replacing the old component with the new component, and using the re-solidified assembly as a drill guide for replacing holes in the new component.

An orbital drill bushing adapter for use with a drill unit. In one embodiment, the orbital drill bushing adapter comprises a main body and locking arms. The main body includes a base member having an upper surface, a lower surface, and an external side wall that extends between the upper surface and the lower surface. The main body further includes a cylindrical spacer that projects from the lower surface of the base member, and is configured to fit in a drill hole of an orbital drill bushing. The main body includes a cylindrical hole that passes through the base member and the cylindrical spacer. The locking arms are pivotally coupled to the base member, and are configured to clamp the main body onto the orbital drill bushing.

Drilling aid apparatuses and methods for drilling a structure are provided. In one example, a drilling aid apparatus includes a bushing holder portion. The bushing holder portion has a first surface for facing a first structure portion, a second surface on a side opposite the first surface, and an opening formed through the bushing holder portion extending from the first surface to the second surface. The opening is configured to receive a bushing that is sized for guiding a drill bit for drilling into the first structure portion. A first coupling member is coupled to the bushing holder portion and is configured to couple to a second structure portion for supporting the bushing holder portion in a fixed position relative to the first structure portion.