Operations on Lathe Machine drilling, boring and reaming & machine troubleshooting

1. DRILLING|Boring|Reaming
Machine Tools & Machining
Department of Mechanical Engineering
University of Engineering & Technology Lahore

2. Presented By:
Ali Raza 2017-ME-516

3. Drilling
• Drilling is a material removing or cutting process
that uses a drill bit to cut a hole of circular cross-
section in solid materials
• The bit is pressed against the work-piece and rotated
at rates from hundreds to thousands of revolutions
per minute.

4. Working Principle
• The rotating edge of the drill exerts a large force on
the workpiece and the hole is generated.
• The removal of metal in a drilling operation is by
shearing and extrusion.

5. Materials
High Speed Steel (HSS) is used to drill metal
Cobalt Steel alloys are used to drill stainless steel and
other hard material
Low carbon steel is used for drilling wood
Tungsten carbide is used to drill hole with diameters
less than 1 mm
Polycrystalline diamond (PCD) bits are typically used
in the automotive, aerospace, and other industries to
drill abrasive aluminum alloys, carbon-fiber
reinforced plastics, and other abrasive materials

6. Materials Coating
Black Oxide
Titanium nitride
Titanium Aluminium Nitride
Titanium Carbon Nitride
Zirconium Nitride
Aluminium Chromium Silicon Nitride
Boron Aluminium Magnesium

7. 1- Operations | Drilling
When we need a circular hole in a workpiece
of any size there, we can use drilling operation,
by a drilling operation we can form any size of
holes in a workpiece.

8. 1- Drilling: Centre Drill
If a long piece of material has to be turned on a lathe then a centre
drill is used to produce the hole at one end. This allows the drilled end
to be supported by the tailstock centre.
The starting point for drilling with a centre lathe is to use a
countersink bit. This is used to drill slightly into the material and
creates a starting point for other drills that are going to be used

9. 1- Drilling: Twist Drill
Once a hole has been produced by a centre drill,
machine twist drills can be used to enlarge the
hole and if necessary to drill all the way through.

10. 2- Operations | Boring
Boring operation is used to enlarge a hole or
cylindrical cavity made by a previous process
(drilling) or to produce circular internal grooves.
Boring process can be done after drilling
operation.

11. 3- Operations | Reaming
Reaming process is used to finishing the drilled
hole.
Reaming process makes the surface smooth.

12. Troubleshoot
 Possible Errors:
1. Insufficient Machine Torque
2. Insufficient Machine Power
3. Hole not symmetrical
4. Poor Toll Life
5. Broken insert screw
6. Deflections
7. Hole not cylindrical
8. Flank or Crate wear
9. Drill Breakage

13. Troubleshoot
1- Indexable Insert Drill:
Increase coolant flow, clean filter, clear coolant
holes in drill
Check alignment on lathe

14. Troubleshoot
2- Vibrations:
• Shorten drill overhang, improve the workpiece
stability
• Reduce cutting speed

15. Troubleshoot
3- Chip jamming in the drill flutes:
• Check geometry and cutting data
recommendations
• Increase coolant flow, clean filter, clear coolant
holes in drill
• Reduce feed within recommended cutting data
• Increase cutting speed within recommended
cutting data