Low level direct interpolation for parametric curves

This article presents an algorithm for the direct interpolation of parametric planar curves C(u) with a CNC machine. It expresses parametric planar curves as sequences of machine tool axes discrete movements of BLU size. Therefore, the curve C(u) is directly approximated by the pulse trains, hence eliminating one source of the machining errors

Digital twin control of multi-axis wood CNC machining center based on LinuxCNC

Abstrack: This paper presents an application of an open architecture control system implemented on a multi-axis wood computer numerical control milling machining center, as a digital twin control. The development of the digital twin control system was motivated by research and educational requirements, especially in the field of configuring a new control system by “virtual commissioning”, enabling the validation of the developed controls, program verification, and analysis of the machining process and monitoring. The considered wood computer numerical control (CNC) machining system is supported by an equivalent virtual machine in a computer-aided design and computer-aided manufacturing (CAD/CAM) environment, as well as in the control system, as a digital twin. The configured virtual machines are used for the verification of the machining program and programming system via machining simulation, which is extremely important in multi-axis machining. Several test wood workpieces were machined to validate the effectiveness of the developed control system based on LinuxCNC

Break, Make, Retake: Interrogating the Social and Historical Dimensions of Making as a Design Practice

Making and digital fabrication technologies are the focus of bold promises. Among the most tempting are that these activities and processes require little initial skill, knowledge, and expertise. Instead, they enable their acquisition, opening them up to everyone. Makerspaces and fab labs would blur the identities between professional and amateur, designer and engineer, maker and hacker, ushering in a broad-based de-professionalization. Prototyping and digital fabrication would unite design and manufacturing in ways that resemble and revive traditional craftwork. These activities and processes promise the reindustrialization of places where manufacturing has disappeared. These promises deploy historical categories and conditionsexpertise, design, craft production, manufacturing, post- industrial urbanismwhile claiming to transform them. This dissertation demonstrates how these proposals and narratives rely on imaginaries in which countercultural practices become mainstream by presenting a threefold argument. First, making and digital fabrication sustain supportive environments that reconfigure contemporary design practice. Second, making and digital fabrication simultaneously reshape the categories of professional, amateur, work, leisure, and expertise; but not always in the ways its proponents suggest. Third, as making and digital fabrication propagate, they reproduce traditional practices and values, negating much of their countercultural and alternative capacities. The dissertation supports these claims through a multi-sited and multinational ethnographic investigation of the historical and social effects of making and digital fabrication on design practice and the people and places enacting. The study lies at the intersection of science and technology studies, human-computer interaction, and design research. In addressing the argument throughout this scholarship, it explores three central themes: (1) the idea that making and digital fabrication lead to instant materialization of design while re-uniting design with manufacturing; (2) the amount of skill and expertise expected for participation in these practices and how these are encoded in rhetoric and in practice; and (3) the material and social infrastructures that configure making as a design practice. The dissertation demonstrates that that the perceived marginality of making, maker cultures, digital fabrication allows for its bolder promises to thrive invisibly by concealing other social issues, while the societal contributions of this technoculture say something different on the surface

Productivity improvements at small manufacturing company’s shop-floor

An effort to increase and improve the productivity has been started by the case company at which this thesis was conducted. Various productivity measures and improvements are being currently being studied to achieve a leaner production and easy material flow. In productivity improvements the ultimate goal is to seek out new production manufacturing processes that can increase the company’s overall efficiency in order to stay competitive in the market. This could be accomplished by the reduction or total elimination of losses that occur mechanically or through a bad operational process. The aim of this thesis is to develop a simple productivity measuring of the manufacturing machine and also to make a bidding calculator or sales tool to be used to speed the rate at which they set bids. By using literature from previous studies, unstructured interviews of managers, supervisors and employees the tasks to be performed were set. A recording sheet was created to record the rate at which the machines at the shop-floor were being utilized and this study we named as machine hour study. This study is to help us to understand the current state of utilization so as to figure out measures to increase the productivity. The second task was to modify the bidding calculator or sales tool to be more user-friendly. Lastly, the author was to recommend other projects that could help in the improvement of productivity at the shop-floor. The significant result is the fact that the machines being used in manufacturing were being underutilized which was agreed by the supervising managers at the shop-floor. Some of the reasons pertaining to this result are too much setup in a working day, long searchers for tools, not enough work, etc.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format