Control Engineering Online Update for June 11, 2004



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Aerospace Manufacturing Technologies employs non-contact laser scanning and inspection software to complement coordinate measurement machine final inspection of milled, stretch-formed, and sheet metal parts.

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Non-contact verification and CAD comparison combine to cut inspection time

Quality inspection is one of many areas where engineering processes can impact a company's supply chain operations. Few other areas in the manufacturing process hold such sway, however, when it comes to the critical point of getting customer-worthy product out the door.

"Better processes in design, analysis, machine tools, and cutter technology have improved manufacturing reliability and speed tremendously, but quality inspection still lags behind," says Matt Reinhard, CEO of Aerospace Manufacturing Technologies (AMT). "Manufacturing has a fire-hose capacity, but quality inspection clamps it down to a drizzle."

Arlington, WA-based AMT manufactures 3-, 4-, and 5-axis milled parts, stretched-formed parts, and sheet metal parts of all sizes for the aerospace industry. The company recently turned to non-contact laser scanning and computer-aided inspection software to speed its part verification. Traditional coordinate measurement machines (CMMs) are used by AMT for final quality inspections.

The new process employed by AMT starts with a Metron Systems' MSG2 scanner, which captures a manufactured part as a highly detailed 3D point cloud. The MSG2, an 18- by 26-inch cube, allows AMT to place the part ready for inspection on a rotating table and scan at a rate of up to 5,000 points per second. If the part is too large for the cube, the scanner can be moved and configured in a larger area to capture the necessary points.

The large numbers of points captured during scanning enables AMT to closely inspect complex contours, forms, shapes and holes quickly and accurately. This is a major advantage over CMMs, which can scan only 30 to 40 points in the time it takes the MSG2 to scan thousands. Metron's system can complete a scan in about half the time it would take a CMM, according to Reinhard.


Metron Systems' MSG2 scanning system

Metron's scanners ( ) can also handle materials considered problematic for non-contact scanners, such as highly reflective materials. These materials, such as aluminum and titanium, can be handled without painting, dusting or other methods of alteration.

Before implementing the MSG2 scanner, AMT's first-article quality inspection could take half a day to set up and hours to run. By changing to non-contact part verification and automating much of the work, AMT sets up inspections in as little as half an hour. The actual inspection might take only a few minutes. The reduced time saves manpower, cuts costs, and adds flexibility for design changes, according to AMT's Reinhard.

"Faster response times are critical," he says. "While CMMs are accurate, the high cost, slower speeds and difficulty correlating to 3D CAD models make them less conducive for adjustments during the manufacturing process. Customers like Boeing are pressured by OEMs as they try to cut inventory, and we need to decrease the time involved in the inspection phase of manufacturing."

Part-to-CAD comparison

The second part of AMT's new inspection process involves processing the 3D point cloud data for the manufactured part and comparing it with the corresponding 3D CAD model. For that, AMT uses Geomagic Qualify software from Raindrop Geomagic ( ).

AMT loads the CAD model supplied by the customer and the point cloud captured by the Metron scanner into Geomagic Qualify. The CAD model and the point cloud are automatically aligned within Geomagic Qualify, and color maps depict deviations. As AMT runs graphical comparisons for dimensions, datums, features, and other quality factors, the software automatically records the session for reporting purposes.

AMT uses the Geomagic Qualify reports to help designers decide what alterations are necessary, to make changes to its milling machines, or to certify that the part is suitable for further production. Reports can be formatted in HTML, PDF, Microsoft Word and Excel, allowing them to be used in print or online for collaborative assessments.

Behind the scenes, a template of information gathered by the MSG2 scanner and Geomagic Qualify during the first inspection of a particular part allows subsequent inspections of the same part without a new set-up. AMT is using this capability to develop a library of 200 different part inspection profiles that will further automate its processes.

"Once the library is implemented, we will be able to put a part on the scanner, hit a barcode, and automatically scan the part," says Reinhard. "Geomagic Qualify will bring in data from the inspection library and then develop a finished inspection report without user intervention."

Gaining acceptance

Eventually Metron's MSG2 scanner and Geomagic Qualify software could extend beyond AMT's first-article inspection and dimensional verification to encompass the company's entire quality inspection process. But for now, Reinhard says industry standards dictate using CMMs for quality inspection before shipping parts to customers.

"Our obstacle is getting customers familiar with the process we use for first-article inspection," says Reinhard. "By creating an industry standard for non-contact parts verification, valuable time savings will improve the flow of the supply chain and relieve pressure on our customers as they move to just-in-time inventory and other cost-saving measures."


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