Single-edged gun drill is the common and widely used type of gun drill. The drill bit is divided into integral sintered carbide drill bit and carbide inserts-piece steel drill. Drill stem and drill
stock are heat treated. Drill bits, drill stems and drill stocks are welded as a whole.
Regrinding of Carbide Gun DrillGundrill shall be compulsorily ground regularly. In other words, regrinding shall be conducted as per Table 2 when back wear extent of the cutter reaches the indicated http://www.gsmdrilling.com ...