CNC or Computer Numerical Control is growing in importance in
schools. This section is an introduction to CNC Router machining and explains
in simple terms the equipment needed and how it can be used.
A rotary indexing head allows a CNC Router machine
to create 3-dimensional shapes in the round. It’s an accessory that can be
added to most CNC machines. Some companies even make it as a stand alone
machine. A rotary indexing head looks similar to a standard woodturning lathe,
but its approach to shaping wood is quite different.
In fact, it’s more like milling than woodturning. One of the best features of a rotary indexing head is its ability to create shapes that aren’t easily turned on a standard wood lathe, such as this hexagonal chisel handle. Intricate round relief carvings are also possible. Because it’s CNC Router based, a rotary indexing head is capable of great precision and easy repeatability. However, since the shaping is done with a router bit in small increments (as small as 1/50" per pass), the milling process can take a while to complete.
Machining this chisel handle took about 2-1/2 hours, but its unique shape was intriguing to design and mill. It also makes an attractive addition to my tool box.
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