ity and viewing angles. For both round and shaped holes, the VisionGauge 700 Series automatically verifi es precise hole presence and accurately measures hole location—typically achieving repeatability of ±0.0001" (0.00254 mm).


“We must meet strict requirements, including dimensional tolerances that can be as small as ± 0.0063 mm,”


Tong reports several benefi ts since using the 700 Series to check the hundreds of holes on the heat shield family of products. “The CMM can only rotate on the head whereas the VisionGauge fi ve-axis solution can locate on the X-Y plane as well as Z,” said Tong. “The 700 Series has linear axes with 0.25 µm resolution and a 0.005" [0.127-mm] resolu- tion on the rotary axis, making it more accurate in angle inspection than with the CMM. Unlike the VisionGage, the CMM can only rotate at every 7.5°, which limited our ability to meet our customer’s inspection requirements.” Tong also likes that the 700 Series requires no contact with the parts, which eliminates the possibility of marking or material deformation of the part. The digital optical compara- tor works directly with the part’s CAD data and does not require any overlays, Mylars or templates, which can result in increased errors.


Paradigm inspectors have appreciated the high-resolution 20× optical magnifi cation in a 38" (965-mm) diagonal image viewing area, which allows them to easily and accurately lo- cate holes in all different angles. Tong points out that an ultra- bright all-LED illumination offers stable, repeatable multiangle and multiquadrant illumination conditions via a program- mable, computer-controlled system. The system comes with very fl exible and general-purpose refl ected illumination. The 700 Series features CAD Auto-Align and CAD Auto Pass/Fail tools. The Auto-Align tool automatically aligns CAD data to the part in less than two seconds, producing repeatable and accurate results that are completely operator- independent. The powerful Auto Pass/Fail tool automatically determines, very accurately and in real-time, if a part is within tolerance. The Auto Pass/Fail tool can be point-based or can consider complete geometric entities and perform both simultaneously, on the same part.


The comparator can be set up to automatically collect complete electronic documentation and device history for SPC and quality compliance purposes. “VisionGauge Digital


Optical Comparators allow users to compare a part to its CAD data in real-time, fully automatically,” said Tong. “This elimi- nates human error and signifi cantly speeds up the process.”


Proof in the Results


When evaluating the VisionGauge 700 Series, Paradigm found no other method was comparable to this fi ve-axis digi- tal optical comparator solution. By switching from the CMM to the VisionGauge 700 Series, results include increased accuracy, especially on parts—or holes—with complex ge- ometry. Time saving is another huge benefi t. Hellwig said that on one part with 50 holes, inspection used to take about one hour with the CMM. Now the same part takes about 10–15 minutes, a 75% time savings. Tong continued, “An even greater time savings of 85% is


realized when inspecting parts with 300 holes or more. And, VisionGauge makes 100% inspection more realistic in order to meet our customers’ expectations.”


VisionGauge 700 Series Digital Optical Comparator at Paradigm Precision.


Since Paradigm supplies components to many major


aerospace engine manufacturers, requirements from each OEM vary. But the VisionGauge 700 Series is versatile for meeting whatever requirements the aerospace majors have, allowing them to customize inspection for each customer. As a component supplier to aerospace OEMs, being ac-


curate, effi cient and fl exible are key to remaining competitive, and the VisionGage solution has helped Paradigm’s inspec- tion fl y.


This feature was edited by Senior Editor Michael Anderson from information provided by Method Machine Tools Inc.


137 — Aerospace & Defense Manufacturing 2015


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