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Quality Digest


Exact Metrology Helps Pattern Maker Ensure Greater Accuracy

Accurate Pattern is able to reduce customer nonconformances by inspecting patterns in-house

Published: Wednesday, April 21, 2021 - 12:01

Located in Butler, Wisconsin, Accurate Pattern has specialized in wood, metal, and plastic patterns, tools, fixtures, gauges, prototypes, and models since 1985. Technologies and services include CAD design, manual and CNC machining, wood and metalworking, painting and welding, plastic fabrication, and form services such as design, engineering, and production job shops.

Originally known as Accurate Pattern & Model Inc., the company was founded by brothers Bruce and Brian Williams in February 1985. Accurate Pattern supplied its first customers with precision patterns for urethane-molded parts. In 1986, the company was incorporated, and Bruce became president. In November 2007, Accurate Pattern moved to its current location, a plant featuring 19,000 sq ft of shop and office space and 5,000 sq ft of mezzanine. Bruce has used Exact Metrology products throughout the years to ensure accurate, reliable results.

Bruce met Dean Solberg, Exact Metrology co-president, when he was looking to buy an Elm CMM/layout machine with PC-DMIS software. Solberg was in contact with a sales representative at Elm Systems and helped Accurate Pattern by setting them up with the right machine, configuration, and software.

“We only entered the quality-fixture market because of the inspection capabilities Dean helped us obtain,” says Williams.

Scanning the mold of a car

Close-up scan

Data from the scan

In 2014, Solberg helped Bruce by suggesting he purchase a Wenzel machine for coordinate measuring with CNC. Subsequently, Bruce purchased a Wenzel CNC CMM with Open DMIS software. The following year, he attended an Exact Metrology Open House and saw the Romer Absolute Arm in action. He purchased the Hexagon Absolute Arm 7-Axis, making it the company’s second CMM system that ensures precision and meets quality certification requirements. During the last year, Accurate Pattern worked with Exact Metrology to change the Open DMIS software on Wenzel to PolyWorks|Inspector.

The Elm machine added great capabilities to pattern and fixture measurement. Before that, the company had only been able to use height gauges and calipers, and they weren’t able to certify their work. The Elm allowed Accurate Pattern to start quality fixture building and greatly improved accuracy in all their work. According to Bruce, “The Romer Arm with PolyWorks|Inspector was a game-changer for inspecting patterns and molds 100 percent to reference CAD data.”

Previously, personnel were only able to perform spot checks with hand tools. This was both time–consuming and inefficient. Now, the large reach of the model (approximately 13 ft diameter) allows personnel to check patterns like truck hoods, wind turbine blades, and boat hulls in a single setup. If necessary, users can shift the scanner on its portable stand, and the software stitches the scan data together.

“The Romer arm’s 0.003 in. accuracy confirms the quality our customers need,” says Bruce. Switching from Elm to Wenzel CNC CMM increased checking accuracy and efficiency tenfold. Previously, they were only able to guarantee ± 0.004 in. (0.1 mm). Now, measurement accuracy is better than 0.0003 in. (0.006 mm). With support from Exact Metrology, the company added PolyWorks|Inspector software to their Wenzel DCC CMM machine. Now, they can certify-inspect quality fixtures in half the time it took with their old software.

Daniel Jones, the model-shop manager at the company, commends Exact Metrology for the attention and help they’ve received. He says that Exact does an excellent job with its customers by having workshops and open houses to teach and train them in new areas of development as well as how to use hardware and software in more productive ways. Furthermore, Jones appreciated how quickly Exact Metrology responded to their requests, as they have an office in Brookfield, Wisconsin. “On multiple occasions, when we were having difficulties, or when problems arose, they were able to be here that same day to help resolve the issue or direct us to the right solution,” says Jones. “It is good to know that we have an industry partner that is ready and able to provide the service and expertise that we needed.”

Thanks to the collaboration with Exact Metrology, Accurate Pattern was able to successfully complete two different projects. These involved first article inspections, quick changes on a car model, and modifications to a cast aluminum tool.

The Hexagon Romer Absolute Arm was used to complete first article inspections for fiberglass- and vacuum-formed parts. Romer was also used when the pattern on a model car needed changing. Thus, the scanner was used to align on a 5-axis router and recut within 0.005 in. Then, while painting, personnel laser inspected so that they knew how much to hand-sand and still maintain accuracy.

Recently, a cast aluminum tool needed to be modified. To know wall thickness and the position of water lines, the tool was laser scanned to help compare the results to the CAD data and machine within the wall, and not damage water lines.

Using Romer has greatly helped the company. “We have been able to greatly reduce our customer nonconformances by inspecting our patterns in-house,” says Jones. “This has gained us greater confidence from our customers and has helped us produce more accurate patterns. We have also been able to remachine jobs with more precision, thanks to the capabilities of scanning the job in position on the machine.”

Reverse engineering is made easy with the company’s digitizing service. Accurate Pattern digitizes existing shapes to CAD format for redesign and reproduction. This enables rapid design changes, scaling, or mirror imaging. The company builds patterns or tools to produce vacuum-formed, composite, foam, or cast parts. They typically run wood, metal, steel, and tooling boards.

Accurate Pattern serves many different industries, including aerospace, automotive, consumer, energy, lawn and garden, marine, foundry, medical, and equipment. Additional industries served are military, point of purchase, pump and valve, transportation, fiberglass, injection molding, laminating/composites, metal forming, and vacuum.

Bruce looks forward to the future of his company, stating, “I want to do verification on the machine, have handheld scanning for onsite digitizing, and have cloud-based CAD, inspection, and reverse engineering software.” He also plans on using a large-format metrology scanner.

The company will receive ISO 9001 certification this year. Having always stressed quality, Accurate Pattern will soon have a system to ensure customers that all their expectations will be fulfilled.

“We would not be the company we are without the likes of Dean and the crew at Exact,” says Bruce. “They have given us a great competitive advantage in the world of metrology that applies to all our patterns, molds, fixtures, and tools.”

For technical information on Accurate Pattern, contact the company by phone, (262) 781–5558; via their website, www.accuratepattern.com; or by email, BruceW@AccuratePattern.com. For a virtual tour of the company, download the video.

About Exact Metrology

Exact Metrology is ISO 9001- and AS9100-certified as well as FFL- and ITAR-registered. With facilities in Cincinnati; Moline, Illinois; and Milwaukee, plus affiliated offices throughout the country, Exact Metrology is a comprehensive metrology services provider, offering customers 3D and CT scanning, reverse engineering, quality inspection, product development, and 2D drawings. The company also provides turnkey metrology solutions, including equipment sales and lease/rental arrangements.


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For 40 years Quality Digest has been the go-to source for all things quality. Our newsletter, Quality Digest, shares expert commentary and relevant industry resources to assist our readers in their quest for continuous improvement. Our website includes every column and article from the newsletter since May 2009 as well as back issues of Quality Digest magazine to August 1995. We are committed to promoting a view wherein quality is not a niche, but an integral part of every phase of manufacturing and services.