SPINDLE ( Device )
NEW ( BETTER )
The spindle is the main
mechanical component in machining centers. The spindle shaft rotates at
different speeds and holds a cutter, which machines a material attached to the
machine tool table. The static and dynamic stiffness of the spindle directly
affect the machining productivity and finish quality of the workpieces. The
structural properties of the spindle depend on the dimensions of the shaft,
motor, tool holder, bearings, and the design configuration of the overall
spindle assembly.
The overall expert spindle
design system is outlined in Fig. 1. The design of the spindle with optimized
bearing spacing is automated using the requirements set by the machining
application, expert spindle design rules, cutting mechanics, structural
dynamics and chatter stability of milling process.
(H. Eskicioglu, M. Akkok, O.H. Yildiz Computer aided selection of machine tool
spindle bearing arrangements, American
Society of Mechanical Engineers, Petroleum Division (Publication) PD, 64 (8-1)
(1994), pp. 181–187 )
( OLD )
A spindle is a
device that allows rotation between components whili providing three
properties: stiffness, load capacity, and accuracy. Examples are found in
machine tools, metrology instruments, and everyday conveniences like computer
hard drives. rotation of rotor relative to the spindle housing (stator) is
achived throught the use of one or more bearings, which include rolling
element, externally pressurized by hydrostatic, hydrodynamic bearings. A
spindle may be long and slender for high speed or low-profile such as rotary
table. Or it may be a workpiece between centers or perhaps a gimbal, a knife-
edge pivot, or a pair of trunnions intended for only a few degrees of rotation.
Whatever the shape, a spindle has a rotor, a stator, and bearing in between.
( Eric Marsh -
Precision spindle metrology- page 1 )
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