Reference no: EM133748527

Laboratory Work - Part 2

Background
A knuckle joint is a type of joint which connects two cylindrical rods whose axes lies on the same plane and are under a tensile load. It is used to transmit axial tensile force. This joint allows angular movement of the two cylindrical rods in one plane. Knuckle joint is named so as it uses a knuckle pin to join the two cylindrical rods.
Parts of knuckle joint:
1) Two rods which are to be connected
2) Eye end
3) Double Eye End or Fork End
4) Knuckle Pin
5) Collar
6) Taper Pin or Lock Pin or Split Pin

Knuckle joint is used to connect two rods in which one rod has one eye end and the other rod has two eye end or the fork end. These ends are named one and two eye ends as one of these has one hole and the other one has two holes.
One eye end is placed between the two eyes of the two-eye end or fork end. After that, a knuckle pin is inserted in the holes of the eye end and fork end. Knuckle Pin is used to hold fork end and eye end together. Some part of knuckle pin comes outside of the lowermost hole of the fork end. Knuckle pin has a small hole near its bottom. A collar and a tapper pin are used to lock the knuckle pin in the eye and fork end. The collar has two holes in it and the collar is placed in such a way that hole of knuckle pin coincides with holes of the collar and after that a tapper pin is inserted in the holes of the collar through the hole of knuckle pin. In this way a knuckle joint is formed.
Advantages of using knuckle joint :
1) It can withstand large tensile loads.
2) It has good mechanical rigidity.
3) It can be easily dismantled and assembled.

Disadvantage of using knuckle joint :
1) This joint cannot withstand large compressive loads.
2) Less flexible than universal joints
3) Allow movement in only one plane.

Applications of knuckle joint in different machines :
1) In automobile a knuckle is supporting skeleton for wheel assembly.
2) Joint between link of Suspension bridge.
3) Joint between tie bar and roof trusses.
4) Tie rod joint of jib crane.
4) Chains Of bicycle
5) Wipers of vehicle
6) Chain straps of watches

Lab Report

Students are required to document each project in the form of a lab report. The format of the Lab Report is as follows (Following the MIT format as discussed in the lectures). Use this as guideline in documenting your projects. Not all items may be needed in documenting the projects you undertake.

Purpose/Objective(s) Why are we doing the lab? What questions are you trying to answer?
Hypothesis What do you expect the results to be?
This should relate directly to the problem
Materials List of all the Materials you will use during the lab
Procedure Steps should be listed and numbered.
Steps should be clearly written, detailed, and brief
It must indicate HOW data will be taken
Tabulated Data Must be in the form of a table
Be sure to use units
Analysis Graphs, calculations, important observations
Conclusion A good conclusion answers 3 questions:
What did you do in the lab?
Restate the purpose/problem
A brief description of how you tested it
What you used to gather data
What does your data say?
Look at your data table or sketch and turn it into a sentence or two.
What did you learn?
This should answer the question posed in the purpose/problem.

Part 1: One Eye End

In order successfully complete this lab, you need to carefully read and follow every step of the instruction.
Objective: To draw 3D model of Knuckle joint parts and join them together in a full assembly
Materials Required:
Solidworks Software
Procedure:
Start-up Solidworks software by double clicking the following icon

Create a new document from File menu, select Part from Templates and click OK.

From the left below menu select units CGS (centimetre, gram, second)

Select Front Plane , click Sketch. Draw 2 circles both starting from origin of diameters of size 100 and 50 cm (user Smart Dimension to set the diameters size).

Expand and select centerline and draw horizontal centerline starting from origin of circles.

Select corner rectangle and draw corner rectangle around centerline starting from the edges of larger circle. Press . Highlight 3 lines while holding CTRL key (2 longer sides of rectangle and centerline) and under Properties make relations Symmetric.

Using Smart Dimension set the width of rectangle to 60 cm, the length to 140 cm

Click on Trim Entities and trim inside lines of larger circle and left side of rectangle (to trim entities, hold down and drag your cursor across the entities) . Press

Select Sketch Fillet tool , set Fillet Parameters to 50 cm. Select rectangle and edge of circle as shown below from both sides and press .
Exit the sketch and using Extruded Boss/Base extrude your model to 60 cm in Depth, press .

Select the following plane and click sketch, right click on that plane and click normal to .

Draw the circle in the middle,set the diameter to 50cm using Smart Dimension, set the distance between center of circle and right edge of part to 30 cm.
Select the origin point on the right and the center of circle while pressing CTRL key, under Add Relations select Horizontal and press .

Now draw the triangle using the Line tool on the upper corner of rectangle as shown below. Using Smart Dimension set the 2 sides of triangle to 18.06cm.

Select Circular Sketch Pattern (expand Linear Sketch Pattern), select the origin of circle as center point, in Entities to Pattern area select 3 lines of triangle, set number of instances to 4 and press .

Exit the sketch mode by rebuilding it, go to features tab and click Extruded Cut. Under Selected Contours area select those 4 triangles, set depth to 60 cm and press .

Select the sketch under Cut-Extrude (expand Cut-Extrude feature) and click on Extruded Boss/Base. Clear the Selected Contours area and choose the following circle and extrude it to 120.5 cm and press .

Define the material of the part using the following tool. . Double click brushed steel (Appearances MetalSteel). Now your first part is ready, save it in new folder and name Part1.

Part 2:
Create a new document from File menu, select Part from Templates and click OK. Do not forget to change the units to centimeters (if not by default)
Select Top plane and click sketch.
Draw corner rectangle starting from origin of size 250 by 120 cm (Smart Dimension tool must be used to set dimensions).

Rebuild sketch , go to features and using Extruded Boss/Base extrude the rectangle to 100 cm.

Click on top face of box, click sketch and normal to.

Draw centerline from bottom to down in the middle, draw 2 circles as shown below starting from different origin points.

Define the dimensions of circle (Smart Dimension), smaller diameter is 60 cm, larger circle diameter to 120 cm. The gap between origins of circle set to 4 cm. Set the distance of upper edge to the origin of smaller circle to 150cm.

Draw the vertical line connecting upper edge and circle's edge. Set the distance between the line and centerline to 30 cm, distance between upper edge of rectangle and origin of smaller circle to 150 cm.

Select Sketch fillet, set parameters to 50 cm and choose the line and edge of larger circle from both sides.

Now draw a vertical line connected from left center edge of smaller circle to lower edge of the rectangle. Mirror it about centerline (using mirror entities as previously).

Now select trim entities and trim below semicircle lines of smaller circle.

Click rebuild the sketch and move to Features tab.
Select the last sketch and click Extruded Cut. Select the following regions under selected Contours. Under Direction1 select Through All and press .

Select the following face and click normal to and Sketch.

Draw the circle.

While pressing CTRL key, select the edge of circle and left edge of rectangle, under Add Relations click Tangent. Repeat the procedure for upper and lower rectangle edges to make circle tangent to the 3 sides of rectangle.

Select centerline and connect the origin of circle with the right edge of part.

Draw rectangle and set Symmetric relation to horizontal sides of rectangle to centerline (highlight upper and lower lengths of rectangle and centerline and under Add Relations select Symmetric).

Set width of rectangle to 60 cm.

Draw another circle with the same origin of previous circle with diameter of 50 cm.

Choose Trim entities and delete inside lines as shown below.

Select Sketch fillet, set parameters to 25 cm, and select the upper horizontal line of rectangle with circle edge and lower horizontal line with circle edge. Press .

Select all outer edges of rectangle and click convert entities.
Go to Features tab, select last sketch, click Extruded Cut and select the following regions, under Direction 1 select Through All.

Select the following face, click Normal to and Sketch.

Draw diagonal centerline

Create the circle from the center with diameter size of 50 cm.

Using Line tool draw the following triangle. And set the 2 sides of triangle to 17.40 cm.

Click Circular Sketch Pattern. Select 3 sides of triangle in Entities to Pattern area, across the point of circle origin and press .

Go to features tab, click Extruded cut, and select those 4 triangles and cut up to 60 cm.

Now select the sketch under Cut Extrude, and clock Extruded Boss/Base. Extrude the middle circle up to 150.7 cm.

Define the material of the part using the following tool. . Double click brushed steel. And your part is ready. Save the file and name it part2.

Part 3: Knuckle Pin
Create a new document from File menu, select Part from Templates and click OK. Do not forget to change the units to centimeters (if not set by default)
Select Front plane and click sketch.
Start from origin, draw the following figure using line tool.

Assign the following dimensions.

Go to features tab and click Revolved Boss/Base.Select bottom line as axis of revolution. press .

Select Top plane, click normal to and Sketch.
Draw the circle with the diameter of 6 cm, and distance to left edge of 130 cm as shown below.

Select origin point with origin of part and add Horizontal relation.

Go to features tab, click Extrude Cut, and choose Through All-Both under Direction1. Press

Assign brushed steel for the material type, you may also change the colour of the part by clicking Edit Appearance tool.
Save the file and name it part3.

Part 4: Knuckle Pin
Create a new document from File menu, select Part from Templates and click OK. Do not forget to change the units to centimetres (if not set by default)
Select Front plane and click sketch.
Draw 2 circles from the origin with the diameter of size 70 and 50 cm.

Extrude sketch up to 20 cm

Select top plane and sketch.

Draw the circle of diameter of 6 cm and distance between upper edge and circle origin of 10 cm.

Select circle origin and part origin, create vertical relation.
Click Extruded Cut and choose Through All Both.

Assign material type to brushed steel. Save the file and name Part4.

Part 5: Taper Pin
Create a new document from File menu, select Part from Templates and click OK. Do not forget to change the units to centimetres (if not set by default)
Select Top plane and click sketch.
Draw the circle with diameter of size 6 cm.

Go to features tab and extrude the part to 72 cm.

Assign material type to brushed steel. Save the file and name Part5.

Final Part: Assembling all parts together.
Create new document, select assembly, and click ok.
Insert Part2 and click green tick.
Under Assembly tab click Insert Components and choose Part 1 and place the part.

Click Mate and under Mate Selections select the following 2 inner tube regions. Select Concentric type and press . Now the Part1 and Part 2 tubes can rotate 360 degrees relative to each other.

Select inner region of Part2 and outer region of Part 1 and choose Coincident mate and press .

Now two parts are aligned to each other.

Insert Part3 into our assembly.
Using Mate tool, align using concentric mate the following regions of Part3 and Part2

Using Mate tool, align using Coincident mate the following regions of Part3 and Part2

Insert Part4 component.
Using Mate tool, align using concentric mate the following regions of Part3 and Part4

Using Mate tool, align using concentric mate the following regions of Part3 and Part4.

Insert the last element Part5 in our assembly.
Using Mate tool, align using concentric mate the following regions of Part4 and Part5.

Using Mate tool, align using Coincident mate the following regions of Part4 and Part5 with minimum distance of 1 mm.