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Hydrostatic Spindle

Hydrostatic spindle is one of the main categories of the machining spindles. It is used for fixture of a workpiece or a tool in grinding machines, milling machines, or lathes. Hydrostatic spindles are special designed spindles for milling, turning, grinding, and special-purpose machining. The unique feature of this type of spindles is that they are run by hydrostatic bearings which are used in high load, high speed or high precision applications where ordinary ball bearings are of no use as they have short life or high noise and vibration. The integration of individual components with processes in such spindles provides the high levels of accuracy, productivity, and reliability required for machining quality.

Hydrostatic spindle

Features of hydrostatic spindles
All hydrostatic spindles have certain features as follows:

Hydrostatic spindles combine high-static stiffness, very-high rotational accuracy, and extremely high-resistance to vibration and low sensitivities to both high built-in motor temperature and imbalance force.
These spindles are wear free and have higher damping than ball bearings.
The axial and radial running of such spindles is also better.
Hydrostatic spindles have specific oil cool features which make them very effective and high functioning.
The hydrostatic oil circulates around the spindle and clean the spindle continuously. It helps the spindle to keep cool which rectify the thermal based measuring errors.
Hydrostatic spindles are made for all type of categories like belt drive, motor spindle, or direct drive.
These spindles suspend on the bearings wear free with great runout at high stiffness without reducing over time.
They are free of friction when they do not move.

Types of hydrostatic spindles

Hydrostatic milling spindles
Hydrostatic cam grinding spindles
Hydrostatic external grinding spindles
Hydrostatic spindles for test station
Hydrostatic lathe spindles etc.

Uses of hydrostatic spindles

Hydrostatic spindles are used for the machining of special motor parts of the cars with high stiffness and runout.
In modern lathes if there are higher requirements of the production to runout, damping, long term precision or temperature constancy then hydrostatic
Lathe spindles are the most preferred option.
In test stations, where precise measuring of forces and torque is necessary, hydrostatic spindles are used.
Like other spindles, hydrostatic spindles are used in various machining tasks like grinding, milling, drilling etc.

Advantages of hydrostatic spindles

They provide highest machining accuracy.
They are very stiff and damp caused by hydrostatic bearings.
They work with high shaft speeds.
They have a compact design.
They have almost unlimited bearing life.
They can take high forces etc.

Advantage of hydrostatic spindles over ball bearing spindles

There is specific improvement of the dynamic stiffness features.
They have constant finishing surface level.
Increasing of the run-out precision due to the lack of mechanical components between the spindle housing and the rotating shaft.
There is almost no vibrations due to direct contact between mechanical parts.
Equipped with autonomous thermal stabilization.
Compared with ball bearings, longer hydrostatic bearings life due to the lack of wear.
No stops due to the frequent bearing substitutions mounted on conventional spindles.
Hydrostatic spindles require high pressure oil equipment.