ਰੋਜ਼ਾਨਾ ਪੁਰਾਲੇਖ: ਅਗਸਤ 30, 2019

Deep-hole drills are often divided into external chip removal (also known as gun drill), internal chip removal (often abbreviated as BTA by the International Association of Deep-hole Drilling), nesting or spraying chip removal. This paper mainly introduces the development and…