The drilling tests showed that, when drilling 1015
steel, TiN, TiAlN coated and uncoated tools were
able to drill 30 holes in both drilling conditions
(Fig. 3). When drilling 2080 steel in the cutting
condition of V=17.6 m/min (800 rpm), f=0.10
mm/rev, the number of holes drilled by TiN coated
tool was 29 when which drilled by TiAlN and
uncoated tools were 19 and 3, respectively.
However, in the cutting condition of V=26.4 m/min
(1200 rpm), f=0.15 mm/rev, the number of holes
drilled by TiN coated tool was 11 when which
drilled by TiAlN and uncoated tools were 4 and 1,
respectively. TiN coating was found to be
superiour than the others. End view of the