Significant advancements in the field of controls engineering have recently been commercialized which have application to the fields of micromachining as well as for automated alignment, precision machining, tracking and active optics:
1. Cost effective, industrial-class implementations of Momentum Compensation (also known as Frahm Damping) provide low-order cancellation of inertial inputs to supporting structures and are of particular applicability to structures with low natural resonance frequencies;
2. Input Shaping, a patented digital controls algorithm developed at the Massachusetts Institute of Technology, provides effective cancellation of structural resonances in arbitrary actuation;
3. Input Preshaping, a technique realized in both a priori and self-learning implementations, substantially eliminates following errors in repetitive actuation.
Simultaneous advancements in the minimization of multi-axis positioner workpiece mass via parallel kinematics technologies have increased the native bandwidth of the positioners used in these throughput-intensive applications.
The author reviews applications of each of these, alone and together, in a comprehensive overview of the state of the art of high-bandwidth positioning techniques for micropatterning and micromachining.