Recently, Naxos-Union introduced a new, highly integrated PENDULUM MACHINING CENTER it developed to speed up traditional crankshaft production at the Deutz Motor Works in Cologne, Germany. [ ... ] The new crankshaft machining center at Deutz consists of a two dual wheelhead PENDULUM GRINDING MACHINES with two PENDULUM GRINDING HEADS each with a respective cutting capacity of 120 meters per second [ ... ] During PENDULUM GRINDING, which is a very technically demanding process in terms of the open and closed loop technology involved, the shaft is always centrally fixed with respect to the main bearing axis. To achieve the oscillating movement of the grinding blocks weighing several tons, which follows three superimposed angle functions, at the required performance level and submicrometer precision, a high-performance CPU is needed.
http://www.automation.siemens.com/wcmsnewscenter/details.asp...

That's what hundreds of years of experience of making cuckoo clocks does for you, I guess.

Harrap's