Many modifications have been made in the past to the conventional
drill points and references to the better performance of curved
lip drills when cutting cast iron can be found. Similar drill
points do not seem to be as successful with steel.
The objective of this research was set to analyse drill design
and to study the effect on drill performance of changing the drill
conventional flute form when cutting steel.
Changing the conventional flute form has an immediate effect on
the shape of the drill lip - it is no longer a straight cutting
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.