Trepanning on inconel 718

Trepanning on inconel 718, outside diameter Φ360, length 1200mm, trepanning holeΦ200, Φ150 core left . Trepanning is a drilling process that leaves a core. Trepanning is a deep hole drilling process that has broad application over many industries. In many cases, trepanning is meant to be a roughing operation to be honed for finish, or machined further. In other cases, the trepanned hole is fit for use ‘as-drilled’. The common factors for choosing trepanning are a long design,