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Coherix 3D Inline Mastic Dot Inspection

Measuring Mastic Dots and Other Unique Shapes.

Coherix 3D DotMaster™ provides a robust real-time 3D inspection and process control solution for the mastic dot dispensing process. It reduces process variation, minimizes production down time caused by robot re-programming, improves product quality, and increases throughput.

Coherix 3D DotMaster is a specialized Coherix 3D sensor that inspects mastic dots and other unique shapes up to 38 mm in diameter. It ensures the dispensed dot is within user defined tolerances by measuring width at the specified height.

Mastic dots are critical to assuring anti-flutter between panels; in automotive manufacturing they are used to bond the inner and outer panels of hoods, doors, decklids, etc.

Embedded with Coherix proprietary solution software, Coherix 3D DotMaster provides in-line, real-time 3D information on mastic dot height and width with no external computer needed. The sensor is not affected by part color or ambient lighting changes, providing robust operation even in “black-on-black” or “gray-on-gray” situations where 2D techniques fail.

Coherix 3D DotMaster is mounted around the dispensing nozzle and equipped with four high-speed 3D sensors, providing a 360° 3D view of mastic dots in any dispensing direction with no added complexity to robot programming.

Product Features

  • Self-contained, around-the-nozzle solution
  • Quick and easy setup
  • Robot carried or pedestal mounted
  • Robust 3D inspection of dot height, width, and volume 400 times per second
  • Accurate inspection of dot location relative to
    part features
  • Configurable reporting and displays
  • 100% part traceability with flexible archiving options
  • Impervious to ambient lighting and part color changes
  • Automatic adaptation to robot speed changes
  • No added complexity in robot programming
  • Rugged and crash-resistant, IP67 construction for sealed operation
  • No moving components
  • Large storage options (up to 1TB SSD)
  • Easy maintenance



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Once and done

Single-pass 3D dot profile inspection is accomplished using four high-speed laser sensors leading and trailing the dispensing nozzle to track and inspect the dot when applied in either forward or backward direction. Acquiring and processing 400 samples per second, Coherix 3D DotMaster has industry-leading acquisition speed avoiding production slow-downs.

Easy to integrate

Coherix 3D DotMaster mounts around the dispensing nozzle. It easily communicates with whatever protocol your dispenser or robot uses. Coherix 3D Inline Mastic Dot Inspection does not add complexity to robot programming. There are no time-consuming setup changes required for robot speed changes commonly required on other available systems.


Coherix 3D DotMaster leverages a 3D high-speed imaging and processing platform which has proven reliability, inspecting millions of customer parts to date. In addition, Coherix 3D technology has been widely deployed for bead inspection for numerous applications including powertrain RTV, body shop structural adhesive and sealants, final assembly urethane glass, battery thermal paste, and more with OEM and Tier suppliers globally.


The Coherix 3D DotMaster sensor is built with a solid aluminum frame to withstand impacts and IP67 sealed housing that protects the unit in a production environment. There are no moving parts and Coherix 3D DotMaster is the online system that stays online.


5 Year Warranty on Adhesive Inspection