Clevelant Twist Drill Q Carbide Drills

Drilling a 5/16" diameter through hole, 3/4" deep in ASTM A514 Gr. B. structural steel (248 Brinell) with Omega cutting oil at:

2,443 RPM (200 SFM), 0.008 IPR, 20 IPM

Drills were pulled after 500 holes due to desired consistency of wear for regrinding. After 500 holes:

-Avg. maximum cutting lip wear = .006

-Avg. cutting lip corner wear = .011