Rapid prototyping with laser cutting

1995 ◽  
Author(s):  
William Leichter
Keyword(s):  
Rapid Prototyping ◽  
Laser Cutting

Compact Tensegrity Robots Capable of Locomotion Through Mass-Shifting

2019 ◽  
Author(s):  
Tyler Rhodes ◽  
Vishesh Vikas
Keyword(s):  
3D Printing ◽  
Rapid Prototyping ◽  
Laser Cutting ◽  
Design Methodology ◽  
Center Of Mass ◽  
Point Contact ◽  
Internal Mass ◽  
Continuous Change ◽  
Reaction Forces ◽  
Breaking Symmetry

Abstract Robustness, compactness, and portability of tensegrity robots make them suitable candidates for locomotion on unknown terrains. Locomotion is achieved by breaking symmetry and altering the position of center-of-mass to induce “tip-over”. The design of curved links of tensegrity mechanisms allows continuous change in the point of contact (along the curve) as compared to discontinuities in the traditional straight links (point contact) which induces impulse reaction forces during locomotion. The illustrated curve-link tensegrity robot achieves smooth locomotion through internal mass-shifting. Additionally, this tensegrity robot displays folding and unfolding. Introduced is a design methodology for fabricating tensegrity robots of varying morphologies with modular components created using rapid prototyping techniques, including 3D printing and laser-cutting. The techniques are utilized to fabricate simple tensegrity structures, followed by locomotive tensegrity robots in icosahedron and half-circle arc morphologies.

scholarly journals Proportional Microvalve Using a Unimorph Piezoelectric Microactuator

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 130 ◽  
Author(s):  
Arun Gunda ◽  
Gürhan Özkayar ◽  
Marcel Tichem ◽  
Murali Krishna Ghatkesar
Keyword(s):  
Form Factor ◽  
Power Consumption ◽  
Rapid Prototyping ◽  
High Power ◽  
Laser Cutting ◽  
Maximum Displacement ◽  
Open Flow ◽  
Flow Control Devices ◽  
Effective Form ◽  
Control Devices

Microvalves are important flow-control devices in many standalone and integrated microfluidic applications. Polydimethylsiloxane (PDMS)-based pneumatic microvalves are commonly used but they generally require large peripheral connections that decrease portability. There are many alternatives found in the literature that use Si-based microvalves, but variants that can throttle even moderate pressures (1 bar) tend to be bulky (cm-range) or consume high power. This paper details the development of a low-power, normally-open piezoelectric microvalve to control flows with a maximum driving pressure of 1 bar, but also retain a small effective form-factor of 5 mm × 5 mm × 1.8 mm. A novel combination of rapid prototyping methods like stereolithography and laser-cutting have been used to realize this device. The maximum displacement of the fabricated piezoelectric microactuator was measured to be 8.5 μm at 150 V. The fabricated microvalve has a flow range of 0–90 μL min−1 at 1 bar inlet pressure. When fully closed, a leakage of 0.8% open-flow was observed with a power-consumption of 37.5 μW. A flow resolution of 0.2 μL min−1—De-ionized (DI) water was measured at 0.5 bar pressure.

Modular Elastic Lattice Platform for Rapid Prototyping of Tensegrity Robots

2017 ◽  
Author(s):  
Lee-Huang Chen ◽  
Mallory C. Daly ◽  
Andrew P. Sabelhaus ◽  
Lara A. Janse van Vuuren ◽  
Hunter J. Garnier ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
Laser Cutting ◽  
Lattice Structure ◽  
Tensegrity Structures ◽  
Assembly Time ◽  
Scientific Experiments ◽  
Different Shapes ◽  
Time Required ◽  
Elastic Lattice ◽  
Design Techniques

This paper presents a new platform for prototyping tensegrity robots that uses an elastic lattice structure for the robots’ tension network. This approach significantly reduces the time required for design, manufacturing, and assembly, while increasing experimental repeatability and symmetry of the tensioned robot. The platform allows more scientific experiments to be performed in less time and with higher quality. This lattice platform, with associated laser-cutting design techniques developed in this work, has been applied to three types of tensegrity structures: 6-bar spheres, 12-bar spheres, and multiple-vertebra tensegrity spines. For the 12-bar tensegrity case in particular, this new lattice platform has allowed multiple different shapes to be explored as designs for future robots. Basic testing confirmed a reduction in robot assembly time from multiple hours down to a mean of one-two minutes for the 6-bar prototype, five-ten minutes for the various 12-bar prototypes, and approximately seven minutes for the spine.

Toying With Design: Experiencing Design for Rapid Prototyping Using Mini-Fabrication Exercises

2018 ◽  
Author(s):  
Siddharth Banerjee ◽  
Caleb Carithers ◽  
Aniket Chavan ◽  
Devarajan Ramanujan ◽  
Karthik Ramani
Keyword(s):  
Rapid Prototyping ◽  
Undergraduate Students ◽  
Material Properties ◽  
Computer Aided Design ◽  
Laser Cutting ◽  
Classroom Setting ◽  
Gear Pair ◽  
Design Problems ◽  
Hands On ◽  
Aided Design

This study explores the use of mini-fabrication exercises for helping students learn design for rapid prototyping in computer-aided design and prototyping courses in engineering curricula. To this end, we conducted mini-fabrication exercises in ME444 — an undergraduate course at Purdue University. The exercises provide hands-on exposure to design for rapid prototyping principles using simplified design problems. We developed two mini-fabrication exercises in ME444; (i) gear pair design & box design using laser cutting, and (ii) toy catapult design using stereolithography printing. These exercises were tested in a classroom-setting with 51 undergraduate students. Results show the mini-fabrication exercises facilitated students’ learning of geometric dimensioning & tolerancing, part sizing, and material properties in laser cutting and stereolithography printing.

Method to evaluate residual stresses in the laser cutting process

2002 ◽  
Vol 12 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Y. Zamachtchikov ◽  
F. Breaban ◽  
P. Vantomme ◽  
A. Deffontaine
Keyword(s):  
Residual Stresses ◽  
Laser Cutting ◽  
Cutting Process

Medical rapid prototyping (MRP) in adult- and paediatric cardiac surgery

2011 ◽  
Vol 59 (S 01) ◽  
Author(s):  
R Sodian ◽  
S Haeberle ◽  
S Weber ◽  
T Lueth ◽  
A Beiras-Fernandez ◽  
...  
Keyword(s):  
Cardiac Surgery ◽  
Rapid Prototyping ◽  
Paediatric Cardiac Surgery
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