| 摘要 |
A machine tool 2 comprising a shaft 12, for attaching the tool to a rotary drive, and a head, to which a removable abrading disk 10 may be attached, mounted for rotation via a universal joint 20 to the shaft. The universal joint 20 comprises an inner member 22 contained within an outer member 24, the universal joint 20 being so arranged that, in use, the inner member 22 rotates relative to the outer member 24 with two degrees of freedom, whilst rotational movement is transmitted between the inner 22 and outer 24 member. The outer 24 member, and preferably the inner member 22, are of single-piece construction and may be made, preferably from nylon, using 3-D printing. The inner member 22 may further have a spherical body from which extend two pairs of opposing cylindrical portions 34. A flexible seal may also be included between the interior of the outer member 24 and the exterior, and the head may include a spigot 26 for piloting the tool 2 around a hole in which the spigot is received. Methods of preparing the surface of a metal for an aircraft and electrically bonding a metal part to another are also included. |
