Automated Non-Destructive Test Resonant Inspection System

For High Volume Production Lines | RAM-AUTO

Resonant Acoustic Method is designed to help deliver fully inspected parts, economically and on time. Every component has a unique resonant signature or pattern that reflects its composition. NDT-RAM™ detects deviations from the expected signature or pattern. The RAM-AUTO System is perfect for applying efficient and reliable quality control testing to high volume production lines of powdered metal parts, castings and similar components. The system stands alone and can be moved into any production line. RAM-AUTO is fully automated, requiring no user intervention during testing, for efficient and cost effective 100% part testing.


  • Fast - One to three seconds per part, typical*
  • Objective - Ideal for in-line, automated, objective inspection
  • Unattended - No operator intervention needed for inspection
  • 100% Inspection - Test every part prior to shipment
  • Customizable - Conveyor configuration for a variety of parts


  • Powdered Metal
  • Castings
  • Forgings
  • Metal Stampings
  • Ductile/Gray Iron
  • Ceramics
  • Composites
  • Additive Manufacturing
  • Braze/Weld Joints
  • Metal Injection Molding (MIM)

An industrial electric impact hammer strikes parts traveling along a conveyor with a known and repeatable force, and a microphone measures the acoustic response from the part.  Input force and response spectra are measured by the controller, which digitizes the signal, and performs FFT analysis.  NDT software compares results against reference criteria limits and either rejects or accepts the part accordingly.

All of the NDT-RAM systems are ideal for 100% inspection requirements of manufacturers or users of powder metal, metal injection molded (MIM), castings (including ductile iron), forgings, stampings or welding. NDT-RAM provides screening for cracks, chips, holes, out-of-tolerance dimensions, variations in hardness, residual stress, bonding failures and heat-treating processes. Manufacturers that have significant inspection costs (either material or labor costs), produce or use safety-critical parts, have substantial scrap costs due to false rejects or simply want to improve their part quality can benefit from NDT-RAM technology.


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Part Testing RateMinimum 0.5 seconds, typical 1 to 3 seconds *
Part Types TestedMetal, ceramic, high-stiffness composition
Criteria RangesUp to 20 per part setup
Power Requirements200 VAC, Single Phase, 10 Amps
Air RequirementsRegulated 60 psi to 90 psi (414 kPa to 621 kPa)
Overall Dimensions 6 x 4 x 6 feet, typical (1.8 x 1.2 x 1.8 m)

*Throughput dependent on part size and system setup.


Reference DocumentationNDT-RAM Criteria Setup Guide
NDT-RAM Software Manual
RAM-AUTO Hardware Manual
Hardware ComponentsSmart Digital Controller
Industrial Sealed PC
Industrial Electric Impact Hammer and Cables
Acoustic Pickup and Microphone
Variable Speed Conveyor System
Aluminum Frame on Locking Caster for Mobility
Adjustable Photo Eyes
Programmable Logic Controller
Acoustic Chamber
Ejector Cylinder
QualityCalibration Certificates