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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 spindles, each with different designs:

Belt-Driven Spindle:
Comprised 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.


 * External Motor: can be changed to create higher power and torque
 * Max speeds: 12,000-15,00 RPM
 * Advantage: cost affective
 * Disadvantage: limited max speed limits applications

Integral Motor Spindle:
A main component of this spindle is the motor, stored internally.


 * Internal Motor: limited power and torque due to restricted space within the spindle housing
 * Speed Range: 20,000 -60,000 RPM (top speed according to design)
 * Advantage: high top speed expands application use
 * Disadvantage: sensitive life range according to use

Both types, the belt-driven and the integral motor spindles, have advantages and disadvantages according to their design. Which one is more desirable depends on the the purpose of the machine and product(s) being produced.