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In addition, CNC routers may have accessories such as vacuum pumps, with grid table tops or t-slot hold down fixtures to hold the parts in place for cutting. CNC routers are typically available in 3-axis and 5-axis CNC formats. Many manufacturers offer A and B axis for full 5-axis capabilities and rotary 4th axis.
A CNC wood router uses CNC (computer numerical control) and is similar to a metal CNC mill with the following differences: The wood router typically spins faster — with a range of 13,000 to 24,000 RPM; Professional quality machines frequently use surface facing tools up to 3" in diameter or more, and spindle power from 5 to 15 horsepower.
Many modern routers allow the speed of the bit's rotation to be varied. A slower rotation allows bits of larger cutting diameter to be used safely. Typical speeds range from 8,000 to 30,000 rpm. Router bits can be made to match almost any imaginable profile. Custom router bits can be ordered.
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These are often used in CNC machining centers for removing burrs (the small flakes of metal) after a machining process. To achieve optimal surface speed and cutting conditions, burrs are rapidly rotated at high speeds, often in the range of thousands or tens of thousands of RPM , which is typically the maximum speed supported by a given spindle.
A wire-cut EDM machine using the CNC drawing plotter and optical line follower techniques was produced in 1974. Dulebohn later used the same plotter CNC program to directly control the EDM machine, and the first CNC EDM machine was produced in 1976. [10] Commercial wire EDM capability and use has advanced substantially during recent decades. [11]