unit ii-turret lathe

UNIT II

Lathe machine

Lathe (centre lathe)

http://metalworkinglathess.com/wp-content/uploads/2012/03/Lathe-Machine-Tools.jpg

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

Turret (multiple tool post)

https://www.artcotools.com/html5/Turret-HMTL5/Turret-HMTL5.html

Capstan Lathe

Centre Vs Turret /Capstan Lathe

• Headstock has more and heavier range of speeds for higher production rates


• Multiple tool can be positioned• Tailstock is replaced by a tool turret tool

with upto six tool positions


• 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 lathe:

Very high rigidity.

Capstan lathe: Tool support unit

bends/deflects causing vibration.


Turret lathe:

Can handle heavier jobs.

Capstan lathe: less cutting loads. lighter jobs and

precision works.


Turret lathe:

Max. 200mm dia. bar size handling.

Capstan lathe: Max. 60 mm dia. bar

size handling.


Turret lathe:

Full lenght tool travelling.

Capstan lathe: Limited tool length

travelling.


Turret lathe:

Slow rate of tool travelling.

Capstan lathe: Tool traverse is faster

and less fatigue to operator.

Turret /Capstan Lathe Operations

Cylindrical turning


Taper turning


Form turning


Facing


Boring


Drilling


Reaming


Threading


Chamfering


Knurling

unit ii-turret lathe

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