capstan lathe and turret lathe- comparison

Sr. No.	Aspects	Capstan lathe	Turret lathe
1	Turret position	Turret is mounted directly on the saddle.	Turret is mounted on an auxiliary slide, which moves on the guideways provided on the saddle.
2	Feeding of tools	For feeding the tools entire saddle moved.	The saddle is fixed at a convenient distance from the work and the tools are fed by moving the slide.
3	Extent of rigidity	Very high rigidity because all the cutting forces are transferred to the lathe load.	Because of the overhung of the slide or ram, the tool support unit is subjected to bending and deflection, resulting in vibrations.
4	Capability to handle jobs	Can handle heavier jobs.	Can handle lighter jobs.
5	Maximum bar size that can be handled	Upto 200 mm diameter.	Upto 60 mm diameter.
6	Tool travel	Almost full length of the bed.	Limited tool travel.
7	Rate of tool feeding	Relatively slower.	Relatively faster.

Type of carriage

Reach over type or side hung type.

Usually equipped with the reach over type only since it is employed for relatively smaller jobs and therefore, does not require a large swing

over bed.

Other provision

Heavier designs are usually provided with pneumatic or hydraulic chucks to ensure a firmer grip over heavy

jobs.

These lathes do not have such provisions.

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