| Abstract
ID |
|
2027 |
| Title |
|
Axiomatic Design Method Applied to a Parallelogram Micromachine for Low Cost Micromechanics |
| Category |
|
Equipment, Machines & Instruments: Design & Testing |
| Primary
author |
|
|
| Organization |
|
|
|
| Content |
|
This paper describes the experience of the Laboratory of Micromechanics and Mechatronics (LMM) at Center of Applied Sciences and Technological Development (CCADET) at National Autonomous University of Mexico (UNAM), applying simple mechanisms and high level control systems to develop low cost micromechanics. To date, this group has developed three prototypes of micromachine tools, some models of manipulators and several versions of stepping motors for its automation. The main idea to develop low cost micromechanics consists of decreasing in size by a generational way the designs tested at the human scale [1]. The first generation has overall sizes around 200mm, the second generation has overall sizes around 100mm; following this way some generations after, the n-generation could have overall sizes around some millimeters. Now a day, the authors are working in the second generation of micromachine tools.
Using parallelograms and levers, as Richard Feynman propose [2], the authors developed a micromachine tool with resolution of 600 nm. This resolution is the same for the three translational axes and every single axis is able to move along 20 mm. Applying this low cost developed-mechanisms, the movements in each axis has a semicircular trajectory, this kind of motion requires advanced control techniques to convert it in lineal movements. Because of the authors are looking for a proper design to scale in many future generations of micromachines, it is necessary to analyze and to conclude the advantages and disadvantages of the proposed design. This machine has the same setup of stepping motor, gear train, feed screw, lever, and parallelogram for every axis. The employed configuration let the authors to simplify the manufacture process and reduce the number of pieces required for assembly. An advantage of this design consists in the capability to locate all the actuators and gear train elements far from the final motion elements, reducing the inertia problems. It is important to say that these mechanisms are not convenient to apply at human scale because it would result in a machine with huge components.
In order to optimize the elements associated with motion in the micromachine, the analysis design by means of axiomatic design method is presented. The results let the authors to improve original version of micromachine and to propose a better design to minimize the control requirements. The first axiom is used to know the interdependence of every function and its vulnerability in the conceptualization process, while the second axiom is used to know the operational vulnerabilities of the design. The use of the axiomatic design method results in some recommendations that will be showed in the full paper and will be considered for future generations of low cost micromachine tools. |
|
|
|
