Mechanical Engineering

1. Muhammad Zaroon
University of Central Punjab (UCP) Lahore
Mechanical Engineering

2.  a machine for making holes with removal of chips. Drill
ing machines are used for drilling, boring, countersinki
ng, reaming, and tapping.
 Vertical drilling machines are the most widely used in
metalworking

4. Cutting Diameter is the
largest diameter measured
across the top off the land
behind the point.
Back Tapper
The diameter reduces towards
the shank to provide the clearance
And prevent the Friction and Heat

5. parabolic Conventional chip breaker
Provide greater space
for the chips to .
In industry most of
the drills have this
type of construction.
Process where long
chips are produce ,
tight flute radii helps
to breakdown of
chips
The axial length from the
outer corners of the cutting
lips to the extreme back
end of the flutes

6.  To form the cutting edge on the point
 To allow the chip to escape
 To cause the chip to curl
 To permit the cutting fluid to reach the cutting edges
The part of drill body
between the flutes is called Land.
Increase land  increase Tensional Strength
Decrease Land  Chip width increases

7. The helix or rake angle is the angle formed by the leading edge of
the land with a plane having the axis of the drill.

8. TYPES
HIGH SPIRAL
degree
REGULAR SPIRAL
degree
SLOW SPIRAL
degree
34 to 38 28 to 32 12 to 22

9. Fast spiral Drills Slow spiral Drills
•Greater lifting power for
chips
•Used for deeper holes
•Weaker in strength
•Lesser lifting Power for chips
•Generally for shallow holes
•Stronger in Strength