Abstract: The present disclosure concerns an electrode holder (100, 200) for electrical discharge machining, the electrode holder (100) comprising: a frame (103) having a first end (104) and an opposing second end (105); and a cartridge (110, 200) moveably mounted to the frame (103) and having a resilient sealing member (201) with a series of holes (308) each configured to receive a first end of one of a plurality of tubular electrodes (102, 301), the cartridge (110, 200) having an inlet for receiving a pressurised supply of dielectric fluid for transmission to each of the tubular electrodes (102, 301), wherein a cross-section of the resilient sealing member (201) in a plane parallel to a longitudinal direction of the tubular electrodes (102, 301) has a narrow central portion (305) between broader outer portions (306, 307).

Abstract: A component including a first flange located in a first section of the component, the first flange including a contact surface. The component also including a second flange located in a second section of the component. The first flange is configured to attach to the second flange, and the second flange includes a contact surface configured to contact the contact surface of the first flange. The contact surface of the first flange and the contact surface of the second flange each has an undulating surface profile, where each undulating surface profile is defined by at least one peak point and at least one trough point connected by a curved line extending in at least one of a radial or a circumferential direction relative to a central axis of the component.

Abstract: This invention concerns alignment of parts of a multi-part component such as an Intermediate Pressure Compressor (IPC) or High Pressure Compressor (HPC) casing. First and second sections (124,126) of a component (114) are provided with flanges (128,130) having contact surfaces (138,140) provided with corresponding surface profiles formed using smooth radius curves to limit the relative locations of the first and second sections (124,126).