Micro-scale force-fit insertion

Micro Scale Force Fit Insertion

Several LIGA (Lithography Galvonoforming Abforming) test mechanisms have been designed and fabricated to study tribology and performance attributes of LIGA mechanisms. The LIGA test mechanism studied in this paper is a ratchet drive mechanism consisting primarily of pawls, cams, and springs ranging in size from about one-half millimeter to tens of millimeters of various nickel alloys fabricated...

Probe-Based Micro-Scale Manipulation and Assembly Using Force Feedback

Repeatable manipulation and assembly of micro-scale components is a critical capability for future developments in opto-electronics, hybrid microelectromechanical systems, and the integration of nano-scale devices into larger systems. This paper focuses on one particular part of this problem; the manipulation and assembly of microspheres using a single probe with force feedback. A sharp probe c...

Insertion of microneedles into skin: measurement and prediction of insertion force and needle fracture force.

As a hybrid between a hypodermic needle and transdermal patch, we have used microfabrication technology to make arrays of micron-scale needles that transport drugs and other compounds across the skin without causing pain. However, not all microneedle geometries are able to insert into skin at reasonable forces and without breaking. In this study, we experimentally measured and theoretically mod...

Micro-scale Energy Harvesting

Three-axis micro-force sensor with sub-micro-Newton measurement uncertainty and tunable force range

The first three-axis micro-force sensor with adjustable force range from ±20 μN to ±200 μN and sub-micro-Newton measurement uncertainty is presented. The sensor design, the readout electronics, the sensor characterization and an uncertainty analysis for the force predictions are described. A novel microfabrication process based on a double silicon-on-insulator (SOI) substrate has been developed...