Landing Gear: BT-A 
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The Challenge

The customer is machining aerospace landing gear made from 4340 alloy steel using a LeBlond Heavy Duty Lathe with 60 GPM (227 LPM) of oil.

The customer needed to improve the process and reduce cost. They asked Allied for a durable solution at a lower price.

The BT-A Drill completed 43 pieces against Sandvik’s disappointing 2 pieces. The BT-A Drill cost was justified after only 15 parts.


Product: BT-A
Objectives: Improve process
Industry: Aerospace
Part: Landing Gear
Material: 4340 Alloy steel
Hole Ø: 2.05" (52.07mm)
Hole Depth: 11.0" (279.4mm)

The Solution
The BT-A Drill
  • BT-A Drill head
  • T-A insert: #4 series special super cobalt
Measure Competitor BT-A Drill
RPM 500 125
Feed Rate 0.003 IPR (0.0762 mm/rev) 0.006 IPR (0.152 mm/rev)
Penetration Rate 1.5 IPM (38.1 mm/min) 0.75 IPM (19.05 mm/min)
Cycle Time 15 min 1 min 20 sec
Tool Life 2 holes 43 holes
BT-A offered 99% cost per hole savings compared to competitor tooling.

The Advantages
The BT-A Drill provided
  • 99% cost per hole savings
  • Increased tool life
  • Decreased cycle time
  • Eliminated set-up and deburr time