1. Drilling and Allied Operations
By: Iman Maleki
1383 Autumn

2. Drill Nomenclature Web Neck Point Shank Web Thickness Flutes Tang
Helix Angle
Land
Body
Point Angle
Margin

3. Classes of Drills (I)

4. Classes of Drills (II)

5. Drill Sizes Numbered (0.0059-0.4130 in.) Lettered (0.0059-0.4130 in.)
Fractional inch ( in.)
Millimeter ( in.)

6. Drill Material Insert Drills HSS TiN coated Material HSS
Tungsten Carbide
Coat
TiN
TiC
TiCN
Al2O3

7. Drilling Speed • The type of material being drilled.
The cutting tool material and diameter.
The types and use of cutting fluids.
The rigidity of the drill press.
The rigidity of the drill
The rigidity of the work setup.
The quality of the hole to be drilled.

8. Drilling Feed IPR IPM = IPR x RPM Twist Drill Wear
IPM = inches per minute
IPR = inches per revolution
RPM = revolutions per minute.
Twist Drill Wear

9. Drilling Time & Cost Csx1000 RPM = N = pd Drill feed = f = N x fn
Drilling time = T = (L + l)/f
Machining cost = C = (Ch x T )/60
Cs: Cutting speed (m/min)
L: Drilling depth
l: Distance from drill point to workpiece
Ch: cost per hr of machine time
Fn: feed rate per rev.

10. Other Drilling Operations
Spade Drills
length-to-diameter ratios over 100 to1
not available in diameters smaller than 0.75 inch.
Penetration exceed by 60 to 100 percent.
Indexable Carbide Drills
Time consuming in steps

11. Other Drilling Operations
Deep-hole Drilling

12. Other Drilling Operations Deep-hole Drilling
Trepanning
greater tool life because of more teeth.
Up to 6 inch

13. Other Drilling Operations Deep-hole Drilling
Gun Drilling Systems
fast, precision machining

14. Types of Drill Presses
Simple Drill Press

15. Types of Drill Presses
Radial Drill
For Big workpiece

16. Drilling Machine Components
Base
gray iron or ductile iron casting
Column
gray cast iron or ductile iron
steel
Table
Head
Quill assembly

17. Size Classification The horsepower of the motor.
Twice the distance from the center of the spindle to the inner face of the column
The maximum length of quill travel
The size of the Morse taper in the spindle
The horsepower of the motor.

18. Drilling Systems
Multi Spindle Drilling
Gang Drilling

19. Drilling Systems
Turret Drill

20. Operation Set-up
Vises
Drill Jigs
3 purpose (W.P.,Tool)

21. Related Drilling Operations
Reaming

22. Related Drilling Operations
Boring

23. Related Drilling Operations
Tapping

24. Related Drilling Operations
Counterboring
Countersinking

25. Related Drilling Operations
Centering
Spotfacing

27. THE END