A pressure testing system for a hollow component, such as a component formed by a filament winding system and method, includes an outer frame defining a base, and a support mechanism coupled to the base and having at least one movable platform for supporting the hollow component within the outer frame.

To provide a rotating shaft with which flexibility of forming a bend is increased, and the strength is increased while reducing the amount of material.

A V-shaped rotating shaft formed by bending sheet metal. An angle formed on an inner side of a bent portion is less than 90°.

A filament winding system, components, and methods include a rotatable mandrel and a filament source with a set of filaments for wrapping about the rotatable mandrel and forming a component. The filament winding system can also include a mandrel assembly, a tensioner assembly for the set of filaments, and a cutting assembly.

To provide a rotating shaft with which flexibility of forming a bend is increased, and the strength is increased while reducing the amount of material. A V-shaped rotating shaft formed by bending sheet metal. An angle formed on an inner side of a bent portion is less than 90.

A feeding device includes a rotation shaft, a feeding roller that includes a through-hole and that is attached to an attachment position of the rotation shaft by moving along the rotation shaft from one end side of the through-hole through the rotation shaft in a case of attachment, and a stop mechanism that stops movement of the feeding roller before the feeding roller moves to the attachment position in a case of being moved along the rotation shaft from the other end side of the through-hole of the feeding roller through the rotation shaft.