Opening Drill
Landing Gears: Opening Drill® 
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The Challenge

The customer manufactures landing gears made from 4340 alloy steel (269 Bhn) using a Mazak horizontal lathe with water soluble oil coolant. They were opening a 2.125” (53.975 mm) hole to 3.75” (95.25 mm).

To improve production, the customer needed to decrease the cycle time.

The Opening Drill® provided significant time savings. The cost per hole decreased beyond the customer’s expectations.

Product: Opening Drill
Objective: Decrease cycle time
Industry: Aerospace
Part: Landing Gears
Material: 4340 alloy steel, 269 Bhn
Hole Ø: 3.75" (95.25mm)
Hole Depth: 7.00" (177.8mm)

The Solution
The Opening Drill
  • Drill holder: OP3-1L-SS1.5
Measure Competitor Boring Bar Opening Drill
RPM 400 509
Feed Rate 0.012 IPR (0.305 mm/rev) 0.004 IPR (0.102 mm/rev)
Penetration Rate 4.8 IPM (121.92 mm/min) 2.04 IPM (51.816 mm/min)
Cycle Time 19 min 3 min 30 sec
Tool Life 30 parts 30 parts
The Opening Drill offered 73.84% cost per hole savings over the competitor tooling.

The Advantages
The Opening Drill provided:
  • 82% cycle time decrease
  • Decreased cost per hole
  • Eliminated need for multiple passes