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Metal Additive Manufacturing

The State of the Industry Metal additive manufacturing holds tremendous promise in how it will enable the production of components that were previously cost prohibitive or could not be produced with conventional manufacturing processes. As a result, industry and academia are making a concerted effort to further the development of metal additive processes. An increasing…

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Estimating Combined Servo and Galvo Motion Accuracy

In modern motion control systems, the primary figure of merit is often the global accuracy that may be achieved on the workpiece surface. However, when configuring the motion control architecture for more advanced features, such as Infinite Field of View (IFOV), characterizing each element of the systemic errors can be very challenging. This white paper…

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Machine Positioning Uncertainty with Laser Interferometer Feedback

The purpose of this discussion is to explain the major contributors to machine positioning uncertainty in systems with laser interferometer feedback near the work point. We will use an example to quantify these uncertainties in a real implementation of a laser-feedback-driven machine. Laser interferometers are used as a measurement reference for machine correction and accuracy…

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Advanced Motion Control Optimizes Laser Micro-Drilling

In micro-drilling process equipment, the most popular ways to create microvias (blind or buried vias with a diameter ≤150 µm) are mechanical drilling and laser drilling. Mechanical drilling is mainly used in larger apertures such as PCBs or IC substrates. Laser drilling is mainly used in finer apertures such as silicon wafers, ceramic substrates, and…

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Minimum Incremental Motion and Holding Stability in Beamline Positioning

Background Many beamline applications such as X-ray microscopy and Computed Tomography (CT) require positioning of samples, detectors, and optics in order to perform measurements. Microscopy applications often require imaging of the structure of matter at the sub-micrometer and even nanometer level. Good holding stability, both short-term and long-term, is required because movement of the sample…

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Harmonic Cancellation Algorithms Enable Precision Motion Control

The internal model principle of control theory states that algorithms designed to perfectly reject input signals must contain a model of that input. Feedback control that adheres to this internal model principle has led to the development of harmonic cancellation algorithms and even more complex repetitive controllers. How Are They Useful? Periodic disturbances are commonplace…

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Maximizing Optical Alignment Precision by Choosing the Correct Positioning Architecture

Advancements in silicon photonics and micro-optic technologies are driving automated alignment tolerances down to nanometer levels. Misalignment between optical components in today’s photonic devices directly impacts the quality of light transmission, and only a few micrometers of misalignment can result in final device power losses of 50% or more (Figure 1). Photonic device manufacturers are…

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Top 3 Ways to Increase Your Positioning System’s 3D Accuracy

Positioning systems are used to automate almost every high-precision manufacturing process. Many of these processes occur in 3D. Some examples include positioning a part’s surface in 3D to be 100% inspected and laser cutting a feature along a complex 3D path. For these types of processes, it’s exponentially harder to achieve manufacturing tolerances in terms…

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