June 24, 2007
June 24, 2007
June 27, 2007
12.1107.1 - 12.1107.9
Development of Non Contact Surface Roughness Measurement Instrumentation Abstract
This paper presents the design and implementation of a non-contact Surface Roughness probe from a pc based data acquisition system to a standalone measurement instrument system. The use of OrCAD PSpice is demonstrated for circuit design, analysis and PCB layout for the fabrication of the PCB board that will interface and drive the surface roughness probe.
Introduction: Need and Background
The demand for higher product quality requires continuous monitoring of various processes and product conditions. It is obvious that one of the essential aspects of quality control in many manufacturing operations is the measurement of surface finish quality of the machined parts during the manufacturing process. Variation in the texture of a critical surface of a part influences its ability to resist wear and fatigue, to assist effective lubrications to increase or decrease its friction and abrasive action with other parts, and to resist corrosion
Many techniques have been developed to measure surface roughness, which vary from the conventional profilometer to the recently developed laser diffraction technique. An attempt is made in this paper to present a simple, reliable and robust way of evaluating the roughness of an engineering surface regardless of the work piece orientation. The research has wide applications in manufacturing industries. One typical application suggested in this paper is the measurement of surface finish of an aircraft gas turbine rotor blade.
The original use of the Surface Roughness Probe was part of an inspection system, used on CNC / Robotic machines for Pratt and Whitney . Currently, for analyzing surface roughness, the probe is connected to a PC via a data acquisition card running VisSim as shown in Figure 1. In this current configuration the probe is capable of reaching an instrument accuracy of ±0.025 µm for a Ra range of .05 to 0.4µm. Computer Interface Data Robot Acquisition Card
Workpiece Laser Probe
Figure 1. Surface Roughness Inspection system setup
Campana, C., & Derynioski, B., & Moslehpour, S. (2007, June), Non Contact Surface Roughness Measurement Instrumentation Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. 10.18260/1-2--2857
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