The chisel system, an age-old technique in precision machining, plays a crucial role in the creation of threaded shaft ...

A chisel will only cut as accurately as you hold it. It should be vertical to the face of the wood and held firmly on the line. Strike the chisel firmly so that it sinks well into the wood.

Not with a hammer and chisel, but a 13-foot zinc alloy arm and a spinning diamond-crusted finger. Water jets kept Leonardo cool. This was a week's work for Robo with another two to go.