Proceedings of JSPE Semestrial Meeting

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In most of the Rapid Prototyping systems, finite number of layers is stacked on each other to form a final object, which in turn incorporates, so called, horizontal and vertical stair-stepping effect. One evident cause of staircase effect is deviation between designed layers and built layers. In practice layers may be trapezoidal or rectangular, depending on the slope of the surface with the build direction, but RP process can create rectangular layers only because of recoating and scanning difficulties.Keeping this in view a new SL method, Slant Beam Rotation Scanning, has been studied, which could scan sloping surfaces without additional changes in recoating etc. Adding one rotational degree of freedom and using UV light a new scanning head has been designed to control the angle between light beam and normal to the layer surface. This way light can be inclined and rotated in 360 degrees at will. Using a new data format and multi-stage motion controllers the experimental system has been fabricated to rotate the beam at required build angles.This paper describes basics of new method and other theoretical aspects of the proposed process including new data format and tentative design of the system.

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Since Stair-Stepping is severely detrimental to part accuracy, especially in the form of finish, there has been numerous research efforts in the past to eliminate or, at least, improve this effect. Apparently, any method implementing changes in recoating or scanning or even both, to build sloping surfaces, seems feasible. Paradoxically, most new techniques increase sophistication or create practical hindrances not suitable for an economical solution.The major aim of this research is reduction of stair-stepping effect using less technical resources and keeping the system simple. To realize such a system, Slant Scanning SL System has been fabricated and experimented at. A number of experiments performed have proved the feasibility of the new technique and subsequent reduction of stair-steps. The salient features of the new design are: use of UV light, lesser degrees of sophistication required and same working during up-facing and down-facing etc.This paper describes design, fabrication and experimental results of the Slant Beam Rotation Scanning system.

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Modern ink jet printers are capable of generating small sized less than 5 picolitre drops. Recently researchers has developed high concentration of silver nanoparticles with low resistivity and can be cured at temperature as low as 150°C. They can be applied to substrates such as plastic film and glass plate. With the finer pitch of electronics components, ink jet printing offers better alternative as they are non-contact and could produce higher resolution conducting lines. This study explore the possibility of using ink jet printing to directly write electronic circuit with silver nanoparticles inks.

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