Small Part Non-Destructive Resonant Inspection Drop Test Fixture

High Volume Resonant Inspection for Small Parts | RAM-DROP

The Drop Test Fixture, Model RAM-DROP, Resonant Inspection System, allows automated sorting and quality testing of small metal injection molded (MIM), powder injection molded (PIM), additively manufactured, and other small parts by using the Resonant Acoustic Method (NDT-RAM).



  • Industrial Computer
  • Large part handling capability, up to 5 in
  • Visual pass/fail indication via light tower
  • Exit chutes support a wide variety of part sizes
  • Wide base for increased stability
  • Multiple feeding options (left, center, right)


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

The principle of NDT-RAM is simple. Every part has a unique resonant signature or pattern that reflects its composition. Any deviation from the expected signature or pattern indicates the presence of a structural flaw or variation. An example is a cracked bell that no longer has a clear ring and cannot hold its tone.

RAM-DROP automates easily with typical small part automation components like bowl feeders or vibratory tables and is instrumented with a laboratory grade force sensor, microphone, and digital signal analyzer while still being rugged enough for the manufacturing environment. This easy-to-use NDT system can detect imperfections or flaws such as cracks, missing features, and mixed parts. It can also detect if processes have been missed, such as a machining or heat treating operation.

With typical throughput speeds of one to three seconds per part, RAM-DROP provides a means for objective sorting that requires no human interpretation. A simple pass/fail result is returned by the system and parts are automatically sorted via a controlled servo motor.



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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
Overall Dimensions24 x 48 x 67 inches, typical (0.6 x 1.2 x 1.7m)
Overall WeightApproximately 250 lb (113 kg)

*Throughput dependant on part size and system setup.


Reference DocumentationNDT-RAM Criteria Setup Guide
NDT-RAM Software Manual
NDT-DTF Hardware Manual
Hardware ComponentsSmart Digital Controller
Industrial Sealed PC
Acoustic Pickup and Microphone
Free Standing Drop Test Fixture
Force Transducer
QualityCalibration Certificates

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.