Drilling 1018 Steel Application

Recently we had an application drilling and counterboring 1018 steel for a customer where they had to drill 9 holes 3/8" x 2" deep. The machine was CAT 40 spindle with 300 PSI coolant thru the tool. The parts were fixtured in a vise- 5 parts to the vise. The customer was originally peck drilling and his cycle time for the 5 parts was > 1hour. Running our carbide drills (coolant fed) 3/8" diameter x 8Xdiameter, @ 5000 RPM @ .012" per rev, we drilled 45 holes in < 5 minutes. We then plunged a 1/2" diameter endmill 3/4" deep to create a counter bore @32" per minute. We ran into a problem with the chip control with the 1/2" endmill. So we then specified a 180 degree drill to drill the c'bore @ 2387 RPM @ .007" per rev. This took < 3 seconds per hole or 3 minutes for all 45 holes. The customer told me right there from his experience that we saved him 48 minutes in cycle time per 5 parts.