Issue link: https://iconnect007.uberflip.com/i/1323994
46 SMT007 MAGAZINE I JANUARY 2021 nest, followed by a bottom-side inspection of critical features. TAP eliminates the inaccu- racies of alternative solutions caused by part movement during a post-inspection (top side only) pick process. Top-Side Alignment Process Steps 1. Machine starts by feeding the component to the feeder location. 2. The Pattern Error Correction (PEC) camera locates the programmed topside features on the component. The topside feature is referred to as the artwork. 3. The PEC camera locates a reference feature with respect to the artwork. 4. The machine then calculates and stores the artwork-to-reference feature offset. 5. The head picks and scans them over the upward looking camera (ULC). Using ULC, it recognizes the same reference feature used by the PEC. 6. The artwork-to-reference feature offset is considered in the determination of the final placement location. 7. The components are then placed on the substrate. Figure 1: Top-side alignment process features. Figure 2: TAP process flow.