drilled in a piece of steel. What is the procedure to countersink the hole?
• A. Set spindle speed to approximately 30% of regular drilling speed, feed countersink into material, then check countersink finish
• B. Set spindle speed to approximately 40% of regular drilling speed, feed countersink into material, then check countersink depth
• C. Set spindle speed to approximately 60% of regular drilling speed, apply cutting fluid, feed countersink into material, then check countersink depth
• D. Set spindle speed to approximately 60% of regular drilling speed, feed countersink into material, apply cutting fluid, then check countersink finish