DESIGN AND FABRICATION OF ELLIPTICAL SLOTTED MECHANISM

DESIGN AND FABRICATION OF ELLIPTICAL SLOTTED MECHANISMA PROJECT REPORTSubmitted byKOWSALYAN.M(612712114070)KUDIYARASU.G(612712114071)MANOK KUMAR.R(612712114080)MELVIN P. ISSAC(612712114082)ABSTRACTInstrument used for drawing ellipses it's a mechanism obtained by having two sliding pairs and two turning pairs. The Elliptical Trammel (also known as the Elliptical Trammel, or the Trammel of Archimedes) is a simple mechanism which can trace an exact elliptical path. An ellipsograph is a trammel of Archimedes intended to draw, cut, or machine ellipses, e.g. in wood or other sheet materials they can be used to draw smaller ellipses but only draw smaller ellipses but only draw half at a time, having to be reversed to draw the complete ellipse.

INTRODUCTIONThe Elliptical Trammel (also known as the Trammel of Archimedes) is a simple mechanism which can trace an exact elliptical path. The trammel of Archimedes, or ellipsograph, is a mechanical device that implements this principle. The mechanism can be used with a router to cut ellipses from board material. An ellipsograph is a trammel of Archimedes intended to draw, cut, or machine ellipses, e.g. in wood or other sheet materials. An ellipsograph has the appropriate instrument (pencil, knife, router, etc.) attached to the rod. Usually the distances a and b are adjustable, so that the size and shape of the ellipse can be varied.

3PARTS OF TRAMMELThe elliptical trammel consists of the following parts.Wooden baseSliding wooden blocksHandle for drawing ellipseNails for attachment

EXISTING MODEL V/S PROPOSED MODEL

Existing Model

Proposed ModelNot provide with space for fixing a pencil

Is provided with a space on the handle for fixing a pencil to trace elliptical path

Plywood is used for just showing mechanismheavy wood used to place the board strong on a planesliding blocks move out of the provided slotperfectly spaced within the slots providing neat working visionRadius of the ellipse cannot be variedRadius of the ellipse can be varied.FUTURE OUTPUT USING ELLIPTICAL TRAMMEL MECHANISMThe initial concept behind the Stiller-Smith Engine was stimulated by a children's toy called a "do-nothing" machine. The toy is a simple wooden block divided into quarters by two grooves through which two small wooden pieces slide when the handle is turned. If the linkage that constitutes the handle is rotated at constant angular velocity the action of the sliders is sinusoidal, linear motion.ENGINE CONCEPT

ABOUT CONCEPT ENGINEThe Stiller-Smith Mechanism first consider the motion of the double-cross slider. It is a pictorial representation illustrating that the center point of the cross-slider link travels in a circular path. Previous attempts to utilize a double-cross slider took advantage of this translation component.ENGINE DESCRIPTIONThough the Stiller-Smith Mechanism is the resulting engine has planar characteristics, there is a certain 3-dimensionality to the actual construction. The mechanism may be used in a number of configurations, however, the fundamental version involves four cylinders in a cruciform layout. Each piston is directly connected to another piston across from it via a non-articulating connecting rod. This arrangement promotes an efficient exhaust cycle opposite the firing cylinder. The two connecting rods are normally perpendicular to each other .

APPLICATIONSIt is used in automatic tool changer in a machining.Elliptical Trammels are used for drawing large ellipses.They can be used to draw smaller ellipses but only draw one half at a time, having to be reversed to draw the complete ellipse.By keeping sharp edged materials in the space provided on handle materials of elliptical shape can be carved out.

ADVANTAGESIt is less expensive compared to metallic board.No much noise is produced.It is portable.Smooth working due to varnished wooden blocks.CONCLUSIONElliptical trammel is inversion of four bar mechanism by fixing a link which to provide rotary motion to other link and by using elliptical trammel we can draw an ellipse. For construction of elliptical trammel we can use wood as a material for perfect demonstration.PROPOSED MODEL

3 D OUTLOOK

REFERENCES1. Beyer Rudolf : "The kinematic synthesis of mechanisms"2.J. W Downs : practical conic sections; the geometric properties of ellipses.3. Jacky Prucz: Mechanisms and machine theory, 19834. James E. Smith : Analysis for application of elliptical trammel in internal combustion engine.5. Reuleaux : "Theoretischekinematik"

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