For high-bay and outdoor lighting fixtures, the cost of LED driver electronics is reported to be 17 percent of the total fixture cost. An additional 40 percent of the fixture cost comes from the mechanical, thermal and electrical portions of the fixture [1]. These portions help support the weight and volume of the LED driver, as well as protect the driver against surge events, such as lightning...

This paper presents a modeling procedure and diagnostic algorithm for fixture related faults in panel assembly. From geometric information about the panel and fixture, a fixture fault model can be constructed off-line. Combining the fault model with inline panel dimensional measurements, the algorithm is capable of detecting and classifying multiple fixture faults. The algorithm, which relies h...

We set up a library of virtual fixtures with both haptic and graphic properties and behaviors. For a given task, Virtual Fixture Assembly Language (VFAL) could be used to construct various virtual fixture series, with graphic and force guidance rules, making the low-level haptic and graphic rendering details transparent to the developers. An experiment evaluated the application of virtual fixtu...

In a machining process, since the geometric accuracy of a manufacturing workpiece mainly relies on the relative position of workpiece to the machining tool, fixtures are needed to locate the workpiece. The clear concept of locating correctness is presented based on Venn diagram and a general algorithm is proposed to determine the locator number and layout. On one hand, the theoretical and pract...

The objective of positioning the fixture elements in the fixture is to make the workpiece stiff, so that geometric errors in the manufacturing process can be reduced. Most of the work for optimal fixture layout used the minimization of the sum of the nodal deflection normal to the surface as objective function. All deflections in other direction have been neglected. We propose a new method for ...

Corresponding Author: Douglas Hiura Longo Department of Informatics and Statistic, Federal University of Santa Catarina, Florianópolis, Brazil Email: [email protected] Abstract: This paper presents an approach to the development of fixture setup code through an objects notation that is applied on implicit test fixtures. This approach is integrated with a management mechanism to call the fi...

We present a class of fixtures that can be disassembled into four pieces to extract the loosely-tied knot. We prove that a fixture can be designed for any particular knot such that the knot can be extracted using only simple pure translations of the four fixture sections. We explore some of the issues raised by our experimental work with these fixtures, which show that simple knots can be tied ...