Presentation on scissor jack
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This document describes the design and construction of a scissor jack. The objectives were to design, construct, and simplify a scissor jack. It discusses the CAD models of the scissor jack parts. Calculations were done to determine the required effort and torque to lift a 200kg load. The scissor jack parts were then constructed, including the arms, power screw, plates, and trunions. Testing showed the designed scissor jack could successfully lift medium-sized vehicles and required torque was within human capabilities. The objectives were achieved by constructing a simplified scissor jack.
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The document describes the design and construction of a connecting rod. It begins with the objectives of studying the connecting rod, understanding its function, designing it using CAD, and constructing a physical model. It then provides an introduction to connecting rods, explaining that they connect the piston to the crankshaft and transmit reciprocating motion to rotational motion. The document discusses different manufacturing processes for connecting rods and compares technologies. It presents the design process for the connecting rod, showing calculations for dimensions. Finally, it includes the CAD model and photos of the constructed physical connecting rod.
Design & Construction of a Connecting rod
The document describes the design and construction of a connecting rod. It begins with the objectives of studying the connecting rod, understanding its function, designing it using CAD, and constructing a physical model. It then provides an introduction to connecting rods, explaining that they connect the piston to the crankshaft and transmit reciprocating motion to rotational motion. The document discusses different manufacturing processes for connecting rods and compares technologies. It presents the design process for the connecting rod, showing calculations for dimensions. Examples are provided of both the CAD model and real constructed connecting rod.
connecting rod
This document describes the design and construction of a connecting rod. It begins with the objectives of studying the connecting rod, understanding its function, designing it using CAD, and constructing a physical model. It then provides an introduction to connecting rods, explaining that they connect the piston to the crankshaft and transmit reciprocating motion to rotational motion. The document discusses different manufacturing processes for connecting rods and compares their strengths. It presents the design process for the connecting rod, showing calculations for dimensions. Examples are provided of both the CAD model and physical constructed connecting rod. Materials used and their properties are also outlined.
Wire and bar Drawing
Drawing is an operation in which the cross section of a bar, rod, or wire is reduced by pulling it through a die opening.
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1) The document discusses the key parts of a DC generator, including the yoke, pole core, field coils, armature core, armature winding, commutator, brushes and brush holders, and bearings.
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3) The class covered the purpose of each generator component and conducted a quiz to test comprehension.
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Couplings are used to connect two rotating shafts and transmit torque from one to the other. There are two main types of couplings: rigid couplings for perfectly aligned shafts, and flexible couplings for shafts with misalignment which absorb shocks and vibrations. Common rigid couplings include sleeve, flange, and split-muff couplings which connect shafts through a sleeve or bolted flanges. Flexible bush pin couplings connect shafts through pins with rubber bushes to absorb shocks and compensate for misalignment.
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The document presents a comparative study of different gantry girder profiles for various crane capacities and gantry spans. Bending moments, shear forces, and section properties are calculated and tabulated for 'I'-section with top and bottom plates, symmetrical plate girder, 'I'-section with 'C'-section top flange, plate girder with rolled 'C'-section top flange, and unsymmetrical plate girder sections. Graphs of steel weight required per meter length are presented. The 'I'-section with 'C'-section top flange profile is found to be optimized for biaxial bending but rolled sections may not be available for all spans.
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This document discusses the optimization of the steering system of an all-terrain BAJA vehicle using bell cranks. The existing rack and pinion system had problems like bending of the rod end and flexing of the rack. A bell crank with a linkage was designed to improve the system. The bell crank was analyzed under different load cases and was found to not fail. Its use on the vehicle showed that it solved the problems and worked well under competition conditions.
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This is one of the projects that I have worked in a team.
My task was to provide the engineering design based on calculations by my esteemed colleagues.
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Dc motor
This document discusses DC motors, including their construction, working principle, types, and applications. It describes the key components of a DC motor such as the yoke, poles, field windings, armature, commutator, and brushes. It explains how DC motors work by converting electrical energy from direct current into mechanical energy. It also covers the different types of DC motors like series, shunt, and compound wound motors along with their characteristics. Common applications of DC motors mentioned include use in vehicles, industrial machinery, and household appliances.
Manufacturing Technology I
The document discusses various bulk metal forming processes including forging, rolling, extrusion, and drawing. It provides classifications and examples of forging types like open die and closed die forging. Rolling processes are categorized by geometry like flat or shape rolling and temperature like hot or cold rolling. Extrusion can be direct or indirect and produces parts with uniform cross-sections. Drawing reduces the diameter of wires or bars by pulling them through a die. These bulk forming methods involve compressive and tensile forces to plastically deform metals into net or near-net shapes.
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This document provides information about a sheet metal forming lab on shearing and bending. The lab objectives are to familiarize students with shearing and bending processes and analyze bending experiments to determine springback in aluminum strips. The document outlines the bending experiment procedure which involves cutting aluminum samples, bending them using different die radii, and measuring the resulting bend radii and angles to calculate springback. It also includes simulations of the bending and springback processes using finite element analysis.
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Presentation on scissor jack
- 1. DESIGN & CONSTRUCTION OF A SCISSOR JACK Course No: ME 3200 Supervised By Presented By Dr. Md. Shahidul Islam Md Fahim Faisal Professor Roll: 1405081 Department of Mechanical Engineering Section: B Khulna University of Engineering & Technology
- 2. Introduction ► Jack is a device for lifting heavy objects, specially for raising the axle of a motor vehicle off the ground to repair or inspect underside of the vehicle. ► Scissor jack is the most common form of different types of jacks. ► It is called a scissor jack as the structure consists of diagonal metal components that expand and contract in the same way as a pair of scissors. ► In this project I have designed and constructed a scissor jack, and simplified it’s construction.
- 3. Objectives ► To design a scissor jack. ► To construct a scissor jack. ► To simplify the construction.
- 4. CAD model of Scissor jack & it’s different parts Fig 1.1 : Arm of scissor jack Fig 1.2 : Bottom plate of scissor jack Fig 1.3 : Top plate of scissor jack
- 5. CAD model of Scissor jack & it’s different parts Fig 1.4 : Power screw of scissor jack Fig 1.5 : Trunion (with threaded hole) Fig 1.6 : Trunion (without threaded hole)
- 6. CAD model of Scissor jack & it’s different parts Fig 1.7 : Assembly model of Scissor jack
- 7. DESIGN Fig 1.8 : Force diagram of scissor jack Length of the arms used = 200 mm The length from base to top center of holes (At Minimum raising height of the jack), e =250 mm Let’s assume, 200 kg weight will be raised. After several calculations It was gotten that Effort required to support the load is 2448.23 N. Mean diameter of the power screw, d = 20 mm So, Torque required to rotate the screw ,τ = effort * d/2 = 2448.23 * 20/2 = 24482.30 N-mm = 24.482 N-m
- 8. CONSTRUCTION Contruction of arms of scissor jack : Flat metal were cut by metal cutter as designed dimensions. Corners were grinded by grinder. Cut two drilled hole for each arm at their two ends by drill machine. Fig 1.9 : Arm of scissor jack Contruction of power screw of scissor jack : A circular rod was turned to the required dimensions in a lathe machine.Then, a hand die was used to create thread. After threading operation two end of the power screw were grinded. Fig 1.10 : power screw of scissor jack
- 9. CONSTRUCTION Contruction of top plate of scissor jack : A flat sheet metal was cut as designed dimension.Then bended as shown in picture. Drilling operation was operated by drill machine. Contruction of bottom plate of scissor jack : Three flat metal sheet were cut as designed dimensions. Two metal sheet chamfered at two edges. Then two metal sheet welded as picture shows. Four hole were drilled by drilling machine as required. Fig 1.11 : Bottom plate of scissor jack
- 10. CONSTRUCTION Contruction of trunions of scissor jack : (a) Trunion with threaded hole: Three metal sheet cut as dimensions.Then drilled as shown.One hole is bored to fit a threaded nut as shown.Then welded the joints should be welded.Finally a threaded nut fitted in the bore by hudraulic press. (b) Trunion without threaded hole: Same as before, just at position of bore there is a drilled hole to pass the power screw easily instead of a bore with threaded nut. Fig 1.12 : Trunion with threaded hole Fig 1.12 : Trunion without threaded hole
- 11. Result & Performance Result : To raise 200 kg weight, Torque required to rotate the power screw = 24.482 N-m Performance : According to design, to raise 200 kg-weight torque required 24.482 N-m. This amount of torque is favourable for any adult human. So, this scissor jack is able to raise any medium size of vehicle like cars from off the ground.
- 12. Conclusion ► In this project I have constructed a scissor jack ,it’s different parts.I also simplified the constructing method.It’s construction process is simple comparatively to other jacks. ► According to design it is proved that this scissor jack can lift a small and medium size of vehicle. And it is easily possible for an adult man to meet the required torque to rotate screw or raise vehicle. ► Finally , I have completed my all objectives.
- 13. THANK YOU ALL FOR YOUR KIND ATTENTION