Step 1: Pilot Hole

• 100% RPM
• 100% IPR (mm/rev)

Details:

• Establish the pilot hole using the same diameter short drill to a depth of 2xD minimum.
• Utilize a pilot drill with the same or larger included point angle.

Coolant: ON

Step 2: Feed-In

• 50 RPM max
• 12 IPM (300 mm/min)

Details:

• Feed the longer drill within 1/16" (1.5mm) short of the established pilot hole bottom at a maximum of 50 RPM and 12 IPM (300 mm/min) feed rate.

Coolant: OFF

Step 3: Deep Hole Transition Drilling

• 50% RPM
• 75% IPR (mm/rev)

Details:

• Drill additional 1xD past the bottom of the pilot hole at 50% reduction of recommended speed and 25% reduction of recommended feed.
• Minimum of 1 second dwell is required to meet full speed before feeding

Coolant: ON

Step 4: Deep Hole Drilling - Blind

• 100% RPM
• 100% IPR (mm/rev)

Details:

• Drill to full depth at recommended speed and feed for longer drill according to Allied speed and feed charts.
• No peck cycle recommended.

Coolant: ON

Step 5: Deep Hole Drilling at Breakout

• 50% RPM
• 75% IPR (mm/rev)

Details:

For through holes only:

• Reduce speed by 50% and feed by 25% prior to breakout.
• Do not break out more than 1/8" (3mm) past the full diameter of the drill.

Coolant: ON

Step 6: Drill Retract

• 50 RPM max

Details:

• Reduce speed to a maximum of 50 RPM before retracting from the hole.

Coolant: OFF