Post on 18-Apr-2015
UNIT II
Lathe machine
Lathe (centre lathe)
Lathe (centre lathe)
Limitations of Centre Lathe
• Only one tool can be used.
• Large setting time of the job
• Idle time in setting and movement of tools is large
• Skilled labour is required
Turret lathe and Capstan lathe
• Multiple tool availability
• Work holding methods
• Automatic feeding of the tools
• Automatic stopping of the tools at precise locations
• Automatic control of sequence of operations
Turret Lathe
Capstan Lathe
Centre Vs Turret /Capstan Lathe
• Headstock has more and heavier range of speeds for higher production rates
Centre Vs Turret /Capstan Lathe
• Multiple tool can be positioned• Tailstock is replaced by a tool turret tool
with upto six tool positions
Centre Vs Turret /Capstan Lathe
• Two or more tools mounted can cut simultaneously.
• Semi-skilled operators are sufficient.
Turret Vs Capstan Lathe
Turret lathe:
Turret is mounted directly on the saddle.
Capstan lathe: Turret is mounted on a
auxiliary slide on the saddle
Turret Vs Capstan Lathe
Turret lathe:
Very high rigidity.
Capstan lathe: Tool support unit
bends/deflects causing vibration.
Turret Vs Capstan Lathe
Turret lathe:
Can handle heavier jobs.
Capstan lathe: less cutting loads. lighter jobs and
precision works.
Turret Vs Capstan Lathe
Turret lathe:
Max. 200mm dia. bar size handling.
Capstan lathe: Max. 60 mm dia. bar
size handling.
Turret Vs Capstan Lathe
Turret lathe:
Full lenght tool travelling.
Capstan lathe: Limited tool length
travelling.
Turret Vs Capstan Lathe
Turret lathe:
Slow rate of tool travelling.
Capstan lathe: Tool traverse is faster
and less fatigue to operator.
Turret /Capstan Lathe Operations
Cylindrical turning
Turret /Capstan Lathe Operations
Taper turning
Turret /Capstan Lathe Operations
Form turning
Turret /Capstan Lathe Operations
Facing
Turret /Capstan Lathe Operations
Boring
Turret /Capstan Lathe Operations
Drilling
Turret /Capstan Lathe Operations
Reaming
Turret /Capstan Lathe Operations
Threading
Turret /Capstan Lathe Operations
Chamfering
Turret /Capstan Lathe Operations
Knurling