DTB's experienced staff of engineers and technicians can perform dimensional inspection on your part or product to ensure its compliance with its design specifications. This task can be accomplished by assessing the geometric characteristics that can affect both the reliability and functionality of the part or product within the desired level of accuracy – in accordance with the guidelines of ASME Y14.5.
We have a 1,000 sq. ft. temperature-controlled dimensional lab, which is equipped with three Coordinate Measuring Machines (CMM – Leitz, Mitutoyo, and Faro), an optical comparator, and a surface roughness measuring station. Our conventional open set-up measuring equipment features three large surface plates, height gages, calipers, micrometers, over 250 thread gages, and over 1,000 plug gages. In addition, our Leitz CMM, which runs QUINDOS software, can measure your gears and splines to AGMA and ANSI standards.
Equipment & Capabilities
Dimensional Lab Equipment & Capabilities
Coordinate Measuring Machines (CMMs):
The Leitz CMM allows for automatic measurements of multiple part samples. An analog probe allows for continuous scanning in all three axes simultaneously. Its QUINDOS software provides geometric tolerancing calculations, along with gear and spline measurement capabilities. The Leitz CMM Model 12.10.6 is of laboratory grade with accuracies up to 0.00008 in. (0.002 mm). This equipment has a measurement volume of 47 in. x 39 in. x 24 in., a maximum weight capacity of 3,000 lbs., and is installed in DTB’s temperature-controlled dimensional lab on an 8 ft. x 6 ft. x 4 ft. concrete slab, which is designed to minimize externally-induced vibrations.
The Mitutoyo CMM Model Crysta-Apex C7106 is a direct computer-controlled high speed programmable CMM with a measuring range of 27 in. x 39 in. x 23 in. and accuracies up to ±0.0002 in. (±0.0051 mm). Capabilities include 2D and 3D measurement analysis; GD&T evaluations; and form, contour, and inspection to CAD models. The Mitutoyo CMM is fitted with a motorized Renishaw touch-trigger probe.
DTB also has a FaroArm Edge Model with 9 ft. measuring volume. We can measure using hard probing or laser scanning techniques on your parts. Volumetric accuracies are up to ±0.0016 in. (±0.041 mm) when using the hard probe.
Surface Roughness Measuring Station:
The dimensional lab contains a Mahr-Federal digitally filtered, non-skidded probe surface roughness measuring station. This station is capable of surface roughness analysis, per ASME B46.1.
Our optical comparator is equipped with auto-edge detection and magnifications of 10x, 20x, and 50x. Capabilities include 2D measurement analysis and GD&T evaluations. The comparator can be run using either surface or profile illumination.
First Article Testing (FAT)
DTB routinely performs first article testing (FAT) for military and commercial suppliers. Complete FAT begins with a review of the supplied technical data package and a visual examination of the part.
Our dimensional inspection plan starts with a complete review of the drawing datum structure and features. The appropriate dimensional equipment is then selected, depending on part tolerances, accessibility, and measurement efficiency.
Upon completion of the inspection, the actual values are recorded on the data sheet and reviewed by our engineering team. In addition, the part may undergo a non-destructive inspection (NDI), hardness, and/or a destructive metallurgical analysis.
Production Lot Testing (PLT)
DTB performs production lot testing (PLT) for military and commercial suppliers. The purpose of PLT is to validate the quality conformance of products prior to lot acceptance. A PLT program is completed on production lots after first article approval and ensures consistency with the original first article test (FAT).
DTB has significant experience in conducting PLT programs for many different products and customers, including on prime contracts with the Navy and Defense Logistics Agency (DLA). A typical PLT program is conducted at our Bohemia, NY facility, under contract with our government customer, on a third party product. We ensure conformance to the drawings - ensuring that each production lot is manufactured to the same tolerances and quality as the first article.
The test results are then summarized in hotline or comprehensive reports, which are submitted to the customer via email or FTP site.
Non-Destructive Inspection (NDI)
Liquid Penetrant Method:
DTB has the ability to perform liquid penetrant NDI, per IAW procedures, based on ASTM E1417. We have certified Level III NDI technicians who are qualified in accordance with NAS 410.
Magnetic Particle Method:
DTB has the ability to perform NDI on parts and materials up to 9.5 ft. in length. We also have portable magnetic particle inspection equipment. The magnetic particle inspections, per IAW procedures, are based on ASTM E1444. We have certified Level III NDI technicians who are qualified in accordance with NAS 410.
DTB can measure your product’s critical features and profiles using the latest measurement technology, such as CMMs and laser scanning (using our Faro Arm). We can import your CAD files to define nominal part shape, as well as perform a part-to-CAD comparison. If you do not have drawings available, our design team can develop the models necessary for your inspection requirements.