High Performance CNC Milling and Turning
Milling is a machining process for removing material by relative motion between a workpiece and a rotating cutter having multiple cutting edges. In some applications, the workpiece is held stationary while the rotating cutter is moved past it (traversed) at a given feed rate. In other applications, both the workpiece and cutter are moved in relation to each other and in relation to the milling machine.
Since both the workpiece and cutter can be moved relative to one another, independently or in combination, a wide variety of operations can be performed by milling. Applications include the production of flat or contoured surfaces, slots, grooves, recesses, threads, and other such configurations.
A major advantage of high speed (high performance) milling is increased productivity. Investigations have shown that the rate of temperature increase tends to decrease at higher cutting speeds. There is no detrimental effect on the finishes produced; in fact, in most instances, smoother surface finishes are obtained
Milling is used for a wide variety of metal removal applications. Materials milled include:
- Carbon and Alloy Steels
- Stainless Steel
- Heat-Resistant Alloys
- Cast Irons
- Nonferrous materials
- Nonmetallic Materials
Turning is a machining process in which a workpiece is held and rotated about its longitudinal axis on a machine tool called a lathe. Cutting tools mounted on the lathe are fed into the workpiece to remove material and thus produce the required shape.
Turning operations are defined as the removal of material from external surfaces on rotating workpieces. Related operations on external surfaces, also performed on lathes, include facing, chamfering, grooving or necking, knurling, skiving, threading, and cutoff (parting). Operations that can be performed on internal surfaces with a lathe include drilling, reaming, boring, threading, and recessing.
Lathes are one of the most versatile machine tools available. Most lathes have the capability for threading; CNC operations include cutting tapered or contoured surfaces, both external and internal. Other operations that can be performed on lathes include spinning, honing, polishing, and buffing.
The bottom line is that the computer-controlled process used in CNC (Computer Numerical Control) machining provides a high degree of accuracy. When machining multiple parts, this permits tight tolerances and precise specifications, part after part (repeatability).
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