Icon Warning Step 1: Approach
  • 50 RPM
  • 12 IPM (300 mm/min)

Details:

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

Coolant: OFF

DHD APX Coolant OFF
 
DHD APX 1
 

 

Step 2: Feed-In

  • Speed at 75% of recommended start
  • Feed at 50% of recommended start

Details:

  • Drill 3/4" deep at 75% recommended speed and 50% recommended feed to establish the hole.

Coolant: ON

DHD APX Coolant ON
 
DHD APX 2
 

 

Step 3: Deep Hole Drilling - Blind

  • 100% RPM
  • 100% IPR (mm/rev)

Details:

  • Drill to full depth at recommended speed and feed for longer drills (according to Allied Machine speed and feed charts).
  • No peck cycle recommended.

Coolant: ON

DHD APX Coolant ON
 
DHD APX 3
 

 

Step 4: Deep Hole Drilling at Breakout

  • 50% RPM
  • 100% IPR (mm/rev)

Details:

For through holes only:

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

Coolant: ON

DHD APX Coolant ON
 
DHD APX 4
 

 

Icon Warning Step 5: Drill Retract
  • 50 RPM max

Details:

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

Coolant: OFF

DHD APX Coolant OFF
 
DHD APX 5
 
Icon Warning Tool failure can cause serious injury. To Prevent:
 
  • When using holders without support bushing, use a short T-A® holder to establish an initial hole that is a minimum of 2 diameters deep.
  • Do not rotate tool holders more than 50 RPM unless it is engaged with the workpiece or fixture.