2,486 research outputs found
Representation of 3D motion by projective angles
No full textThe paper describes a new laser device conceived for surface scanning and more specifically for mini robot calibrations. The system is based on a laser triangulation sensor which is moved by an extremely accurate device to collect a set of 3D points lying on surfaces. If the surfaces belong to the gripper of a robot that must be calibrated and a sufficient number of points of this gripper are collected, the pose of the robot can be measured. If the robot is moved to several different configurations and the gripper poses are measured for each of them, it is possible to reconstruct the kinematics of the robot and calibrate it. The paper presents the theory and describes the design, tests and calibration of the laser instrumentation with a focus on the first experimental results. These results are obtained in a working cell including a vision system, a 4-dof (xyz,) mini robot and a 2-dof rotating platform
A review on benchmark artifacts for evaluating the geometrical performance of additive manufacturing processes
No full textIn recent years, Additive Manufacturing (AM) has undergone a rapid growth, therefore several processes based on different working principles (e.g. photopolymerization, sintering, extrusion, material jetting, etc) are now available and allow to manufacture parts using a wide range of materials. Consequently, the so-called benchmark artifacts are necessary to assess the capabilities and limitations of each AM process or to compare the performance of different processes. This paper focuses on the benchmark artifacts for evaluating the geometrical performance of AM processes and proposes an extensive review of the available literature, analysing the design of such test parts in detail. The investigated test parts are classified according to the process aspect that they are able to evaluate (dimensional/geometrical accuracy, repeatability, minimum feature size) and the combination AM process/materials for which they have been used. In addition, the paper draws a summary of guidelines to design benchmark artifacts for geometrical performance evaluation
Letter from Yosh and Irene [Kuromiya] to Michi Weglyn
No full textA letter from Yosh and Irene [Kuromiya] asking Michi Weglyn for materials to create "a pictorial history of the life of Michi Nishiura Weglyn photos and documents" for the tribute to Michi Weglyn on February 21, 1998.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
Special Issue on Remote Micro- and Nano-Manufacturing Science, Engineering, and Education
No full textWe are living through challenging times. A global pandemic
has forced us to adapt to new ways of living, working, relating,
teaching, and conducting research. Our micro-manufacturing
community is presented with unique challenges during this crisis
since the majority of our research relies heavily on experiments
conducted in the labs and access to research infrastructure has
been severely limited and in-person lab work has been curtailed or
stopped altogether for a significant period. Similarly, in manufacturing education due to health concerns, most of the in-person
classes have transferred to a remote mode of teaching that very
few of us had previous experience with.
The extended duration of the undergoing emergency has transformed some of the approaches that were initially thought of as
quick workarounds and temporary solutions into more durable
methodologies for manufacturing research and education that are
here to stay (possibly in somewhat modified form) in the upcoming years even when the health crisis will pass.
The micro-manufacturing community has been active during
this fraught period in looking for new solutions to challenging
manufacturing issues. Due to limitations to in-person experimental science, many of the research approaches rely more heavily on
theoretical methodologies and simulation of manufacturing procedures. At the same time, challenges of remote operations, automation, optical recognition, implementation of artificial intelligence
in manufacturing processes were required in many cases to continue experimental work. These emerging tools, equipment, and
methods will advance our science and will continue to exist side
by side with more traditional approaches to achieve superior
results in micro- and nano-manufacturing.
This Special Issue of the ASME Journal of Micro- and NanoManufacturing is devoted to Remote Micro- and NanoManufacturing Science, Engineering, and Education. The special
issue contains a representative collection of research works on a
wide range of subjects covering areas from biomedical applications and surface functionalization to hybrid process chains and
the use of artificial intelligence techniques. Opinion pieces are
included as well, and they present reflections on the effects of the
pandemic on the micro-manufacturing research and education in
the USA and on the shift from “in-person” to “online” instruction
mode of project-based teaching of manufacturing.
The Guest Editors would like to thank the Authors for their
prompt efforts in preparing their papers, as well as all the
Reviewers for their assistance. We also thank the ASME Journal
of Micro- and Nano-Manufacturing Editor, the Editorial Office,
and the ASME Production Team.
We hope that our readers will find the subjects and topics discussed in this collection to be useful and thought-provoking
The Mindful Christian with Irene Kraegel
No full textOur guest for this episode is Irene Kraegel, the author of The Mindful Christian. We examine how Christian life is enhanced by mindfulness
- …
