(english) The flaring or tapering of a machined hole, usually made at the entrance end because of misalignment or spring of the cutting tool.
ภาษาไทย
ภาษาอังกฤษ Bell Mouth
ภาพประกอบ (english) The flaring or tapering of a machined hole, usually made at the entrance end because of misalignment or spring of the cutting tool.