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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 [3]-60,000 RPM [2] (top speed according to design) Advantage: high top speed expands application use; Disadvantage: sensitive life range according to use
The machine operates by a high-speed air spindle rotating a grinding bit. The air spindles are removable and interchangeable to achieve varying surface speeds. Some spindles are fixed speed (such as at 60,000 rpm), others are adjustable (such as from 30,000 to 50,000 rpm), and still others are very high speed (such as at 175,000 rpm).
Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. A cutting speed for mild steel of 100 ft/min is the same whether it is the speed of the cutter passing over the workpiece, such as in a turning operation, or the speed of the cutter moving past a workpiece, such as in a milling operation.
Ultra-high speed grinding (UHSG) can run at speeds higher than 40,000 fpm (200 m/s), taking 41 s to remove 1 in 3 (16 cm 3) of material, but is still in the research-and-development (R&D) stage. It also requires high spindle power and high spindle speeds.
Milling is the process of machining using rotary cutters to remove material [ 1 ] by advancing a cutter into a workpiece. This may be done by varying directions [ 2 ] on one or several axes, cutter head speed, and pressure. [ 3 ] Milling covers a wide variety of different operations and machines, on scales from small individual parts to large ...
In 1984, Makino introduced the first commercial high-speed spindle for milling. [6] In 1990, Makino introduced Geometric Intelligence, the first servo-control software tailored to high-speed machining, [6] and Flush Fine machining, a method for cutting hardened materials.
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