Design of integrated eccentric mechanisms and exact constraint fixtures for micron-level repeatability and accuracy

Culpepper, Martin L.; Kartik, Mangudi Varadarajan; DiBiasio, Christopher M.

doi:10.1016/j.precisioneng.2004.05.007

Cited by 27 publications

(11 citation statements)

References 8 publications

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“…In order to achieve the function of positioning and fixture based on the kinematic couplings, the concept of hybrid positioner-fixture is developed (9) , which designed a six-axis adjustable coupling, moving groove and eccentric ball. According to degree of freedom of motion platform, the adjustable coupling should be designed to have a relative independent position inputs.…”

Section: Design Of An Adjustment Mechanismmentioning

confidence: 99%

Analysis and Design of 3-DOF Parallel Mechanism Based on Kinematic Couplings

Han¹

2012

Journal of manufacturing engineering & technology

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This paper presents a high-speed automatic micro-alignment system that is a part of an inspection machine for small-sized molded lenses of mobile phones, palm-top computers, and so on. This work was motivated by the shortcomings of existing highest-grade commercial machine. A simple tip/tilt/Z parallel mechanism is designed based on kinematic couplings, which is a 3-degree-of-freedom (3-DOF) moderate-cost alignment stage. It is used to automatically adjust the posture of each lens on the tray, which is impossible by the conventional instrument. Amplified piezoelectric actuators are used to ensure the accuracy and dynamic response. Forward kinematic analysis and simulation show that the parasitic motion is small enough compared to the actuator stroke. From the workspace analysis of the moving platform, it is clear that the output motion range satisfies the design requirements.

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Section: Design Of An Adjustment Mechanismmentioning

confidence: 99%

Analysis and Design of 3-DOF Parallel Mechanism Based on Kinematic Couplings

Han¹

2012

Journal of manufacturing engineering & technology

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“…Servo controlled kinematic couplings can also use servo controlled actuators to adjust the groove width and position or the relative ball position to control the position of the coupling with three [29] or even six degrees of freedom [30][31][32][33]. The groove contact surfaces are supported by flexures which are then positioned by actuators.…”

Section: Servo Controlled Kinematic Couplingsmentioning

confidence: 99%

Kinematic couplings: A review of design principles and applications

Slocum

2010

International Journal of Machine Tools and Manufacture

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a b s t r a c tFrom the humble three-legged milking stool to a SEMI standard wafer pod location to numerous submicron fixturing applications in instruments and machines, exactly constrained mechanisms provide precision, robustness, and certainty of location and design. Kinematic couplings exactly constrain six degrees of freedom between two parts and hence closed-form equations can be written to describe the structural performance of the coupling. Hertz contact theory can also be used to design the contact interface so very high stiffness and load capacity can also be achieved. Potential applications such as mechanical/electrical couplings for batteries could enable electric vehicles to rapidly exchange battery packs.

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“…[4] described the modular fixturing in computer integrated manufacturing. [5] introduced the six-axis alignment corrections and thereby improved the accuracy of the fixture, and the errors were made to determine and also to adapt the technology where it is feasible.…”

Section: Introductionmentioning

confidence: 99%

Automated Fixture Assembly for a Shallow Water Jet Motor Assembly

Sankar¹,

Sethuraman²,

Sankaran³

et al. 2016

JAMES

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A production unit could be claimed successful, only when it increases the likelihood of easy assembling and minimizes unit production cost. In order to undergo mass production methods, their orientation play a major role in enabling the ultimate operational time and cost. To cope up with such methods, the use of jigs and fixtures are facilitated. The paper encompasses the alternative solution for material handling flaws caused in the assembly process. The frequent reasons for the leakage are the improper positioning of the ceramic bushes in the impeller casing unit, owing to the downfall of the motor efficiency. The bushes are placed manually in general, leading to the improper positioning of the bushes, getting in contact with the rotor/impeller resulting in non-uniform wear, leading to water leakage. These defects could be overcome by introducing an assembly fixture for motor placement and using pneumatic cylinder actuation for the accurate bush placement. This indeed includes the reduction of idle lead time in the assembling process by automating the process of manual bush placement and the manufacturing of defect free products. This signifies the reduced lead time to increase the productivity factor and the efficiency of the motors. Lean study was conducted to reduce the lead time and Value Stream Map (VSM) is reported in this paper.

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Design of integrated eccentric mechanisms and exact constraint fixtures for micron-level repeatability and accuracy

Cited by 27 publications

References 8 publications

Analysis and Design of 3-DOF Parallel Mechanism Based on Kinematic Couplings

Analysis and Design of 3-DOF Parallel Mechanism Based on Kinematic Couplings

Kinematic couplings: A review of design principles and applications

Automated Fixture Assembly for a Shallow Water Jet Motor Assembly

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