▁holes , ▁otherwise ▁it ▁will ▁over he at ▁the ▁dr ill ▁bit . ▁It ▁is ▁also ▁used ▁when ▁dr illing ▁string y ▁material ▁to ▁break ▁the ▁ch ips . ▁ ▁When ▁it ▁is ▁not ▁possible ▁to ▁bring ▁the ▁material ▁to ▁the ▁С N С ▁machine , ▁a ▁Mag net ic ▁Base ▁Dr illing ▁Machine ▁may ▁be ▁used . ▁The ▁base ▁allows ▁dr illing ▁in ▁a ▁horizontal ▁position ▁and ▁even ▁on ▁a ▁ce iling . ▁Usually , ▁for ▁these ▁machines , ▁it ▁is ▁better ▁to ▁use ▁cut ters ▁because ▁they ▁can ▁dr ill ▁much ▁faster ▁with ▁less ▁speed . ▁C utter ▁sizes ▁vary ▁from ▁ 1 2 mm ▁to ▁ 2 0 0 mm ▁D IA ▁and ▁from ▁ 3 0 mm ▁to ▁ 2 0 0 mm ▁DO C ( depth ▁of ▁cut ). ▁These ▁machines ▁are ▁widely ▁used ▁in ▁construction , ▁fabric ation , ▁marine , ▁and ▁oil ▁& ▁gas ▁indust ries . ▁In ▁the ▁oil ▁and ▁gas ▁industry , ▁p neum atic ▁magnetic ▁dr illing ▁machines ▁are ▁used ▁to ▁avoid ▁spark s , ▁as ▁well ▁as ▁special ▁t ube ▁magnetic ▁dr illing ▁machines ▁that ▁can ▁be ▁fixed ▁on ▁pip es ▁of ▁different ▁sizes , ▁even ▁inside . ▁ ▁Dr illing ▁in ▁wood ▁ ▁Wood ▁being ▁so fter ▁than ▁most ▁met als , ▁dr illing ▁in ▁wood ▁is ▁consider ably ▁easier ▁and ▁faster ▁than ▁dr illing ▁in ▁metal . ▁C ut ting ▁flu ids ▁are ▁not ▁used ▁or ▁needed . ▁The ▁main ▁issue ▁in ▁dr illing ▁wood ▁is ▁ens uring ▁clean ▁entry