Opening Drill
Stacked Plates: Opening Drill® 
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The Challenge

The customer manufactures steel lift arms for the heavy equipment industry. The customer purchased two new horizontal boring machines in order to produce these parts. Both machines use a single point bore with coated cermet for finish diameters. The work pieces are stacked plates made of A36. They use 430 PSI (29.647 bar) and synthetic coolant with additives. There were five hole diameters and depths in this complex operation.

The Opening Drill® effectively reduced cycle time and increased tool life, accomplishing the customer’s goals for this operation.

Product: Opening Drill
Objective: Decrease cycle time
Industry: Heavy equipment
Part: Stacked plates
Material: A36
Hole Ø: 4.00" (101.6mm)
Hole Depth: 3.07" (77.978mm)

The Solution
The Opening Drill
  • Drill Holder: OP3-1S-CV50
Measure Competitor First Boring Bar Pass Competitor Second Boring Bar Pass Opening Drill
RPM 528 790 288
Speed 430 SFM (131.064 M/min) 715 SFM (217.932 M/min) 300 SFM (91.44 M/min)
Feed Rate 0.015 IPR (0.381 mm/rev) 0.012 IPR (0.305 mm/rev) 0.006 IPR (0.152 mm/rev)
Cycle Time 4 min 2 min 18 sec
Tool Life 20 min 30 min

The Advantages
The Opening Drill provided:
  • 50% tool life increase
  • Decreased cycle time
  • Eliminated need for multiple passes