INTRODUCTIONINTRODUCTION

• DrillingDrilling is a metal cutting process carried out by a is a metal cutting process carried out by a

rotating cutting tool to make rotating cutting tool to make circular holescircular holes in solid in solid

materials.materials.

• Tool which makes hole is called as drill bit or twist drill.Tool which makes hole is called as drill bit or twist drill.

TYPES OF DRILLING MACHINE.TYPES OF DRILLING MACHINE.

• Portable drilling machinePortable drilling machine

• Bench drilling machineBench drilling machine

• Radial drilling machineRadial drilling machine

• Pillar drilling machinePillar drilling machine

• Gang drilling machineGang drilling machine

• Multiple drilling machineMultiple drilling machine

PORTABLE DRILLING MACHINEPORTABLE DRILLING MACHINE

BENCH DRILLING MACHINEBENCH DRILLING MACHINE

• Vertical main columnVertical main column

• BaseBase

• Moving drill headMoving drill head

• Work table Work table

• Electric motorElectric motor

• Variable speed gear box Variable speed gear box

and spindle feed and spindle feed

mechanism. mechanism.

RADIAL DRILLING MACHINERADIAL DRILLING MACHINE

• Heavy baseHeavy base

• Vertical columnVertical column

• Horizontal armHorizontal arm

• Drilling headDrilling head

DRILLING MACHINE DRILLING MACHINE OPERATIONOPERATION

• ReamingReaming

• BoringBoring

• Counter boringCounter boring

• Counter sinkingCounter sinking

• Spot facingSpot facing

• Tapping Tapping

REAMING REAMING

• It is a process of It is a process of smoothingsmoothing the surface of drilled holes the surface of drilled holes

with a tool.with a tool.

• Tool is called as reamer.Tool is called as reamer.

• Initially a hole is drilled slightly smaller in size.Initially a hole is drilled slightly smaller in size.

• Drill is replaced by reamer.Drill is replaced by reamer.

• Speed is reduced to half that of the drilling.Speed is reduced to half that of the drilling.

BORING BORING

• It is process carried on a It is process carried on a

drilling machine to drilling machine to

increase the size of an increase the size of an

already drilled hole.already drilled hole.

• Initially a hole is drilled to Initially a hole is drilled to

the nearest size and using the nearest size and using

a a boringboring tool the size of tool the size of

the hole is increased.the hole is increased.

SPOT FACINGSPOT FACING

• It is a finishing operation It is a finishing operation

to produce flat round to produce flat round

surface usually around a surface usually around a

drilled hole, drilled hole, for proper for proper

seating of bolt head or seating of bolt head or

nut.nut.

• It is done using a special It is done using a special

spot facing tool.spot facing tool.

TAPPING TAPPING

• Process of cutting internal Process of cutting internal

threads with a thread tool threads with a thread tool

called as called as taptap..

• Tap Tap is a fluted threaded is a fluted threaded

tool used for cutting tool used for cutting

internal threadinternal thread

• Cutting speed is very Cutting speed is very

slow.slow.