Week 11- Assembly Workbench

Aim: To create assembly for CV (constant velocity) joint and quick return mechanism by creating the respective components with the given assembly drawing.

Given input:

• Assembly drawing for CV joint.
• Assembly drawing for quick return mechanism.

SOME IMPORTANT DEFINITIONS

Assembly

• The process ofputting together a number of parts to make a machine or other

Assembly drawings

• Assembly Drawings demonstrate how a number of separate subassembly drawings, detailed parts, standard components and specifications come together in a unified assembly.
• Assembly Drawings must provide sufficient information to enable the assembly of a component.

Bill of materials

• In the assembly drawing above notice the arrangement of the numbering of the individual sub-assemblies, components and standard hardware.
• They are numbered from the bottom of the parts list upwards. The relevant quantities and materials (missing) should also be stated

Top down approach

• Top downapproach starts with entire system and it will be break down into sub-assemblies again into sub systems and again and again till it reaches the elementary part.
• In Top Down Approach I will design the body of the car first, engine, wheels etc… up-to the nuts and bolts

Bottom up approach

• A bottom-upapproach is the piecing together of systems to give rise to more complex systems. Let me brief that by spotting an example of designing a car
• In Bottom-up approach I will design my wheels first and the drive shaft to fit that and i will design or choose engine based on the wheels and finally I will come to the body to house all the components

CV joint

• A CV joint, or constant velocity joint, is part of a drive shaft, the shaft that attaches to a car's transmission at one end and the wheel at the other.
• These joints are designed to be able to bend in any direction while continuing to turn the drive wheels at a constant velocity.
• They are primarily used in the drive shafts of front wheel drive cars

Quick return mechanism

• A quick return mechanismis an apparatus to produce a reciprocating motion in which the time taken for travel in return stroke is less than in the forward stroke.
• It is driven by a circular motionsource (typically a motor of some sort) and uses a system of links with three turning pairs and a sliding pair.

CONSTANT VELOCITY JOINT ASSEMBLY

BODY_1

BODY_2

BODY_3

ASSEMBLY

ASSEMBLY DRAWING

QUICK RETURN MECHANISM ASSEMBLY

BODY_1

BODY_2

BODY_3

BODY_4

BODY_5

ASSEMBLY

ASSEMBLY DRAWING