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APU Bell Inlet for the Aerospace Industry

APU Bell Inlet
APU Bell Inlet

At Precision Metal Products, we specialize at providing low volume, high mix manufacturing services to customers in the aerospace industry. Producing the bell inlet shown here, which featured dimensions of 12" in diameter and 4" in length, required diligent planning and scheduling for the execution of multiple fabrication and assembly processes.

We formed the Poroplate® inner skin and stainless steel outer skin pre-forms on our punch press, then moved them to the spinning lathe to create the axial geometry. Our technicians then used a laser to trim them to a tight ±.005" tolerance. We rough machined the forged ring and welded to the inner liner, then used an adhesive film to bond the honeycomb between the inner and outer liners. Additional operations consisted of finish machining the forged ring, fiberglass layup on the external skin, masking, and painting.

This project showcases our ability to use multiple materials and use a large mix of manufacturing, assembly, test, and inspection processes to produce high-integrity, critical components for demanding applications. If you would like to learn more, or have a project you would like us to evaluate and quote on, please contact us directly.

APU Bell Inlet Project Highlights

Product Name
APU Bell Inlet
Product Description
APU Bell Inlet for the Aerospace Industry
Capabilities Applied/Processes
  • Forged
  • Fabrication
  • Punch Press
  • Metal Spun
  • Laser Trimmed
  • Machined
  • Welded
  • Bonding
  • Riveting
  • Masked
  • Painted
Equipment Used to Manufacture Part
Punch Press and Laser
Paint Shop, Punch Press, and Bonding
Overall Part Dimensions
Ø12" x 4"
Tightest Tolerances
Material Used
Acoustic Poroplate, Honeycomb, Cres 304
Stainless Steel
Fiber Glass
Material Finish
√125 Max
Additional Facts
Poroplate inner skin and Stainless outer skin are formed by use of punch press and metal spinning then laser trimmed to size. Forged ring is rough machined and welded per AWS D17.1 to inner liner. Assembly consists of adhesive film bonding of the honeycomb between the inner and out liners, welded and final machine of forged ring to size. Fiber glass layup on external skin, masked and painted (primer).
In process testing/inspection performed
Standard Inspection Methods, Gaging, Penetrant Inspection, and CMM inspection.
Industry for Use
120 Units/Year
Delivery/Turnaround Time
70 Days
Delivery Location
Standards Met
  • Customer Specifications, 2D CAD Drawing
  • AWS D17.1