ASC 320
ID of Pressure-Sealed Rotor Housing: ASC 320® 
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The Challenge

A manufacturer of helicopter components is machining the ID of a pressure-sealed rotor housing. The part is made from stainless steel, and they are using an Emco Turn CNC Lathe with 300 PSI (21 bar) coolant through the tool to manufacture the parts.

With need to improve production, the customer requested a solution to reduce cycle time and eliminate part distortion.

The ASC 320 successfully reduced the cycle time. Also, the customer gained better chip control, better hole size, and a cleaner finish on the product.


Product: ASC 320
Objective: (1) Decrease cycle time
(2) Eliminate part distortion
Industry: Aerospace
Part: ID of preassure-sealed rotor housing
Material: Stainless steel
Hole Ø: 0.449" (11.405 mm)
Hole Depth: 0.75" (19.05 mm)

The Solution
The ASC 320
  • 335M11400A21M
Measure Competitor ASC 320
RPM 3 Tool Process
  • 0.300" (7.62 mm) Ø solid carbide drill
  • 4 graduated rough bores
  • Two finish bore operations
  • Each boring step required hole flushing
Speed 170 SFM (51.816 M/min)
Feed Rate 0.006 IPR (0.152 mm/rev)
Penetration Rate 11.40 IPM (289.56 mm/min)
Cycle Time 17 min 6.2 min

The Advantages
The ASC 320 provided:
  • 63% cycle time decrease
  • Better chip control
  • Cleaner finish