In machine tool, a spindlehttp://https://www.youtube.com/watch?v=7Qah4iledMQ is a Rotating axis of the machine, which often has a Shaft at its heart. The shaft itself is called a spindle, but also, in shop-floor practice, the word often is used metonymically to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it
A machine tool may have several , such as the headstock and tailstock on a bench lathe. That is usually the biggest one. References to “the spindle” without further qualification imply the main . Some machine tools that specialize in high-volume mass production have a group of 4, 6, or even more main .
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High speed spindle
High speed spindles are used strictly in machines, like CNC mills designed for metal work. There are two types of high speed , each with different designs:
Belt-driven spindle
Consisting of spindle and bearing shafts held within the spindle housing, the belt-driven spindle is powered by an external motor connected via a belt-pulley system.
Integral motor spindle
- Internal Motor: limited power and torque due to restricted space within the housing
- Speed Range: 20,000-60,000 RPM
- Advantage: high top speed expands application use
- Disadvantage: sensitive life range according to use
Both types, the belt-driven and the integral motor , have advantages and disadvantages according to their design. Which one is more desirable depends on the purpose of the machine and product(s) being produced.
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