Computer-aided design of switched attenuators with high precision

1993 ◽  
Vol 40 (8) ◽  
pp. 533-536
Author(s):  
A. Lesnicki
Keyword(s):  
High Precision ◽  
Computer Aided Design ◽  
Computer Aided ◽  
Aided Design

Prototyping of Polymer based Microbioreactors: Micromachining by using Poly(Methyl Methacrylate) and Poly(Dimethylsiloxane) Polymer Materials

2013 ◽  
Vol 63 (1) ◽  
Author(s):  
Hazwan Halimoon ◽  
Muhd Nazrul Hisham Zainal Alam
Keyword(s):  
Methyl Methacrylate ◽  
High Precision ◽  
Computer Aided Design ◽  
Soft Lithography ◽  
Processing Time ◽  
Polymer Materials ◽  
Poly Methyl Methacrylate ◽  
Design Considerations ◽  
Computer Aided ◽  
Aided Design

Polymers have been widely accepted as materials for the fabrication of microbioreactor prototypes. In this work, microfabrication strategies namely the micromachining and casting (soft lithography) with the use poly(methyl methacrylate) (PMMA) and poly(dimethylsiloxane) (PDMS) polymers as substrates for fabrications were discussed in details. A step-by-step illustration (including examples on digital prototyping of the microbioreactor by using a computer-aided-design (CAD) software) for the above mentioned micromachining procedures, and discussions on the necessary design considerations were presented as well. In the work, we showed the simplicity of such machining procedures for the fabrication of microbioreactor prototypes. It was confirmed that through micromachining, microbioreactor prototypes can be fabricated by using poly(methyl methacrylate) (PMMA) and poly(dimethylsiloxane) (PDMS) polymers with high precision (down to one tenth of mm). It was also demonstrated that the processing time for the fabrication of the microbioreactor prototypes was in the order of few hours and maybe days for a complex reactor design. 

Fixtureless Sensor Standoff Control for High-Precision Dimensional Inspection of Freeform Parts

2006 ◽  
Vol 129 (1) ◽  
pp. 172-179 ◽  
Author(s):  
Vijay Srivatsan ◽  
Reuven Katz ◽  
Debasish Dutta
Keyword(s):  
Turbine Blade ◽  
High Precision ◽  
Computer Aided Design ◽  
Manufacturing Systems ◽  
Turbine Blades ◽  
Dimensional Inspection ◽  
Manual Intervention ◽  
Precision Inspection ◽  
Computer Aided ◽  
Aided Design

High-precision, noncontact dimensional inspection requires sensor standoff control due to the working range limitation posed by high-precision range sensors. Constant sensor standoff with the surface of the part is necessary to ensure accurate measurement. This paper presents a novel computer-aided design (CAD) independent approach to sensor standoff control called “fixtureless sensor standoff control (FSC),” which contrary to current methods does not require a fixture or manual intervention for registration. This approach to sensor standoff control will enable rapid, flexible, and high-precision inspection of freeform parts, thus catering to the needs of future manufacturing systems. In the FSC methodology, the sensor’s position for the next measurement is estimated based on immediate previous measurements. The method was implemented on a four-axis machine used to inspect turbine blades. Results from measurement of an example turbine blade showed the deviation from desired standoff to be significantly smaller than the working range of the sensor.

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