Opening Drill
Turbine Components: Opening Drill® 
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The Challenge

The customer manufactures turbine components made from chrome molly alloy steel using a Super 8 VMC with water soluble coolant.

The boring bar machining process moved too slow. The customer needed to reduce cycle time because the parts were scheduled for quick delivery.

Not only did the Opening Drill® decrease the cycle time to meet the delivery schedule, it also greatly reduced the cost per hole.


Product: Opening Drill
Objective: Decrease cycle time
Industry: Renewable energy/energy
Part: Turbine components
Material: Chrome molly alloy steel
Hole Ø: 3.5" (88.9mm)
Hole Depth: 8.0" (203.20mm)

The Solution
The Opening Drill
  • Drill holder OP3-1L-BT50
  •  Indexable Inserts: OP-05T308-H
Measure Competitor Boring Bars Opening Drill
RPM 500 500
Feed Rate 0.005 IPR (0.127 mm/rev) 0.005 IPR (0.127 mm/rev)
Penetration Rate 2.5 IPM (63.5 mm/min) 2.5 IPM (63.5 mm/min)
Cycle Time 2 hr 59 min 1 hr 29.6 min
The Opening Drill offered 40.92% cost per hole savings over the competitor tooling.

The Advantages
The Opening Drill provided:
  • 40% cost per hole decrease
  • Decreased cycle time