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NDT-RAM Systems Selection Guide
Home > NDT > Non-Destructive Small Part Quality Test System – NDT-DTF

Non-Destructive Small Part Quality Test System – NDT-DTF

Resonant Inspection Drop Test Fixture

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

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.


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 (*Note: Video shows NDT-DTF without Industrial Computer, model NDT-DTF2)

The NDT-DTF 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 three seconds per part, the NDT-DTF 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.

NDT-DTF3 Upgraded Features:

  • Industrial Computer
  • Larger part handling capability up to 5 in.
  • Visual pass/fail indication via light tower
  • New exit chutes for a wider variety of part sizes
  • Wider base for increased stability
  • Multiple feeding options (left, center, right)

Product Included

  • NDT-RAM Criteria Setup Guide
  • NDT-RAM Software Manual
  • NDT-DTF Hardware Manual
  • LanSharc™ Smart Digital Controller
  • Industrial Computer
  • Calibration Certificates
  • Computer
  • Acoustic Pickup Microphone
  • Free Standing Drop Test Fixture
  • Force Transducer
  • Cables

Support Services

System Specifications


Drop Test Rate Control Adjustable to your feed-rate
Part Throughput 3 seconds per part, typical*
Part Types Component parts with high stiffness
Maximum Analysis Range 50 kHz
Minimum Analysis Range 500 Hz
Frequency Resolution 512 to 32,768
Analysis Modes Spectrum or Scaled
Available Criteria Ranges 20
Trigger Input Setting Input channel 1 or 2
Delay Processing Capability -50 to +200%
Data Logging Peak frequency and amplitude
Spectral Logging Toggle on/off
Digital Input Solid state relay, qty 4
Relay Setup via Software Normally open or normally closed
Relay Duration, Settable >0.1 seconds
Data Overlay Up to 1500 traces
PC Comm Configuration Includes internal Ethernet and/or serial
PC OS Windows XP, Vista or 7
*Part throughput rate dependent upon part size, belt size, data acquisition setup parameters, and other part handling requirements

Mechanical Specifications


Overall Fixture Size (LxWxH) 24 x 24 x 50 inches
Overall Fixture Weight 80 lbs

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, porosity, 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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