Spindle
Accessories
- Centering the workpiece as in lathes, turrets, boring machines etc.
Or the cutting tool as in drilling , grinding, milling machines
- Clamping the workpiece or cutting tool such that the workpiece or the
cutting tool is reliably held in position during the machining
operation.
- Imparting rotary motion, e.g. as in lathes.
- Imparting translatory motion (as in drilling machines) to the cutting
tool or workpiece.
On the basis of the above fuctions, a spindle is capable of performing wide range of funtions like
- Drilling
- Milling
- Cutting
- Grinding
- Routing
- Engraving
- Boring etc.
The operational capabilities of machine tools in terms of productivity, accuracy, finish machine parts largely depend upon the extent to ehich the above functions are qualitatively satisfied. They also determine the important design requirements to spindle units which aregiven below:
Requirements
- The spindle should rotate with high degree of accuracy. The accuracy
of rotation is determined by the axial and radial run out of the spindle
nose and these must not exceed certain permissible values which are
specified depending upon the required machining accuracy. The rotational
accuracy is influenced at the most by the stillness and accuracy of the
spindle bearings, particularly the one located at the front end.
- The spindle unit must have high static stiffness. The stiffness of
the unit is made up of the stiffness of the spindle unit proper and the
spindle bearings. Machining accuracy is influenced on bending, axial as
well as torsional stiffness.
- The spindle unit must have high dynamic stiffness and damping. Poor
dynamic stability of the spindle unit adversely affects the dynamic
behavior of the machine tool as a whole.
- All spindles consider to be of the highest quality after having passed inspection, testing and run-off procedures prior to shipment, done by the manufacturer.
