Milling spindles are typically the main spindle of machine tools and are responsible for continuous machine cutting. Different tool interfaces are employed to suit the tooling used, including, for example, HSS (hollow-shaft taper), SK (rapidly changeable taper) and HSK (hard surface ketterer). The type of the spindle, the size of the machine, its speed and the materials to be processed can also determine the types of machining applications that it can perform.
Machining applications of the machining spindle may include drilling and cutting, screwing, threading, lathing, grinding, turning and punching. Most machines have a two-sided rotating motion, which means that the first side of the machining spindle rotates in a clockwise direction while the other rotates in a counterclockwise direction. The turning motion of the machining spindle is typically reciprocating. The rotation of the machining spindle enables it to grind or slice through various materials. Most of the machining equipments are equipped with a spindle feed mechanism.
The common tool interface employed by the machining spindles is the ball bearing. Ball bearing can perform both rotating and non-rotating processes. The ball bearings can be either static (they have a fixed roll rate) or dynamic (they move depending on the speed of the machine and other external factors such as temperature, etc). They can also be serviced, adjusted and lubricated.
The machining spindle has a series of parallel rotating disks with three or more teeth on each disk. These teeth are called gears. The gears rotate at different speeds. This allows the machine to run with either a single or multiple speed. For example, in a lathe, a single speed spindle can perform the turning tasks without any noise and friction. On the other hand, in a lathe, multiple speeds machining spindles can perform the non-rotating task in the same batch.
Tool spindles are often fitted with a safety lock to prevent the operator from accidentally cutting the tool. It is also designed with a mechanism for providing a smooth operation when cutting on a rough surface. A number of controls are provided for controlling the cutting speed and the rotation rate of the spindle. Some spindles are designed to operate on automatic mode. When the operator moves the handle on the control, the spindle will automatically rotate. The operator can also engage the automatic operating mode on the machining spindle.
Machining equipment require an accurate and fast tooling. Thus, the safety of the operator and the machining machine are the most important factors to be considered while choosing a machining spindle for machining.