There is little space available and the complex movements put a lot of strain on the cables. The feed rate is 100m/min. and the travels are 4 to 6m. Furthermore, protection from swarf and dust is necessary.
As drilling is carried out at up to 24,000 revolutions, very fine dust is produced which must not be allowed to enter the chain joints, even when the machines are working with flying swarf. The chain should also allow for fast assembly and easy maintenance.