A series of tests have been carried out to determine the machinability
characteristics of Ultra High Tensile Steels in the 120 tons sq. ins. T/S range
with hardness values of 550 to 600 V.P.N.
Tool geometry and cutting conditions for end and face milling, drilling
and tapping were investigated. A basic approach to tapping tests and tap
design was developed.
Short descriptions of the tests and a graphical presentation of the
results are included. These show optimum conditions and the very critical
nature of the variables on tool efficiency for the processes of drilling
and end and face milling, under finishing condition
