By arbor
By sockets
By sleeves
By special clamp
Pillar drilling machine
Gang drilling machine
Radial drilling machine
Sensitive bench drilling machine
B.A thread
B.S.F thread
B.S.W thread
ACME thread
Tap drill size = Major dia ? (2 x depth)
Tap drill size = Major dia + (2 x depth)
Tap drill size = Major dia ? (2 + depth)
Tap drill size = Major dia + (2 + depth)
Too fast feed rate
Too slow feed rate
More cutting speed
Too slow spindle speed
