drilling lecture 1
TRANSCRIPT
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DRILLING MACHINE
Lecture # 1
Ravi Kumar K
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Drilling
Drilling is the operation of producing circular hole in thework-piece by using a rotating cutter called DRILL.
The machine used for drilling is called drilling machine.
The drilling operation can also be accomplished in lathe,in which the drill is held in tailstock and the work is held
by the chuck.
The most common drill used is the twist drill.
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Tool Nomenclature
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It is the simplest and accurate machine used inproduction shop.
The work piece is held stationary ie. Clamped in
position and the drill rotates to make a hole.
Types :Types :--a) Based on construction:
Portable, Sensitive,Radial, up-right, Gang,Multi-spindle
b)Based on Feed:
Hand and Power driven
Drilling Machine
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Sensitive Drilling Machine Drill holesfrom 1.5 to15mm
Operatorsenses the
cutting actionso sensitivedrillingmachine
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Radial Drilling Machine
It the largestand mostversatile
used frodrillingmedium tolarge and
heavy workpieces.
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Drill MaterialsThe two most common types are
1. HSS drill
- Low cost
2. Carbide- tipped drills
- high production and in CNC machines
Other types are
Solid Carbide drill, TiN coated drills, carbidecoated masonry drills, parabolic drills, split pointdrill
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Drilling And Drills
Types of drills
Twist drill: mostcommon drill
Step drill:
produces holesof two or moredifferentdiameters
Core drill: usedto make an
existing holebigger
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Drill fixed to the spindleDrilling operationsDrilling operations
Drilling Centre Hole
Drilling Deep Holes
Drilling ThinMaterial
Drilling Pilot Hole
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Tool Holding devices The different methods used for holding drill in
a drill spindle are
By directly fitting in the spindle hole. By using drill sleeve
By using drill socket
By using drill chuck
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Work Holding Devices
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Drilling Operations
Operations that can be performed in a drillingmachine are
DrillingReaming
Boring
Tapping
Counter boringCountersinking
Spot Facing
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Operations in drilling machine
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Operations in drilling machine
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Types of cutters
Reamers :-Multi tooth cutting tool
Accurate way of sizing and finishing the pre-existinghole.
Accuracy ofs0.005mm can be achieved
Boring Tool:-
Single point cutting tool.
Boring tool is held in the boring bar which has theshank.
Accuracy ofs0.005mm can be achieved.
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Types of cutters
Countersinks :-Special angled cone shaped enlargement at the end
of the hole
Cutting edges at the end of conical surface.Cone angles of 60, 82, 90, 100, 110, 120
Counter Bore Tool:-Special cutters uses a pilot to guide the cutting
action .
Accommodates the heads of bolts.
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Counter bore and spot facing
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Tapping:-
For cutting internal thread
Multi cutting edge tool.
Tapping is performed either
by hand or by machine.
Minor dia of the thread is
drilled and then tapping isdone.
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W
ork Holding Devices 1. Machine Table Vice