Component manufacturing process for skeleton type clockwork, involves rectifying peripheral surface of temporary holes by grinding ,with help of relative movements between plate and grindstone

摘要

The process involves drilling temporary holes (3-9) having diameter lower than the size of a final hole. The drilled holes are enlarged for modifying its shape and/or its dimension. The peripheral surface of each hole is rectified by grinding it with the help of relative movements between a plate and a grindstone. The plate is fixed on a support comprising an edge parallel to the plate. An independent claim is also included for a component in hard crystalline material such as in plate or bridge made-up of sapphire, obtained by a component manufacturing process.