FreeCAD/C3/Eye-end-part-of-Knuckle-Joint/English

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Title of the script: Eye end part of Knuckle Joint.

Author: Dr. Sathiya Narayanan, K. Sakthivel

Keywords: FreeCAD, Part Design, sketcher tools, datum plane, fillet tool, 3D component, video tutorial.


Visual Cue Narration
Slide 1

Title slide

Welcome to this Spoken Tutorial on Eye end part of Knuckle Joint.
Slide 2

Learning Objectives

In this tutorial, we will learn to,
  • Draw an eye end part of the Knuckle joint using Sketcher tools.
Slide 3

System Requirements

To record this tutorial, I am using
  • Windows 11 OS and
  • FreeCAD version 0.21.2
Slide 4

Prerequisite

https://spoken-tutorial.org

To follow this tutorial,
  • Learners must be familiar with the FreeCAD interface.
  • For the prerequisite tutorials, please visit this site
Slide 5


Eye end part.

The Eye end part of the knuckle joint is used to join parts that need to pivot or rotate.
Open the FreeCAD.

Select File and New to open the new file.

Click on the Start dropdown.


Select the PartDesign workbench from the drop down.

Let us open FreeCAD.

I will open a new file.


I have selected the PartDesign workbench.

From the toolbar select Create body.


Select Create sketch.


In the Combo view click on XY-plane(base plane).


Click on OK.

Point to the Sketcher workbench.

Let us create a new Body.


Now select Create sketch to create a new Sketch.


Select the XY-plane and click on OK.

The workbench switches to Sketcher workbench.

Select the Create circle tool from the tool bar.

Place the cursor in the middle of the plane.


Draw a large circle.


Draw a small circle with the same centre.

Now I will select the Create circle tool from the toolbar.


Place the cursor on the centre of the plane and draw two concentric circles.

Point to the tool.

Select the large circle.


Select the Constrain radius tool from the tool bar.


In the Insert radius dialog box, set the radius to 25 mm and click ok.


Select the small circle.


Select the Constraint radius tool from the tool bar.


In the Insert radius dialog box, set the radius to 12.5mm and click ok.

Let us set the radius of the circles using the Constrain radius tool.


Let us change the radius of the larger circle to 25 mm.


Similarly change the radius of the smaller circle to 12.5 mm.

Select the Create polyline tool from the tool bar. Let’s select the Create polyline tool.


The Polyline tool allows you to draw lines continuously.

Place the cursor on the left side circumference of the outer circle.


Left click and drag the cursor horizontally to the left.


Left click again to complete the line.


Drag the cursor vertically downwards.


Left click to complete the line.


Drag the cursor horizontally to the right and place the cursor on the outer circle.


Left click to complete the line.

Place the cursor on the left side of the outer circle.


Drag the cursor to the left to draw a horizontal line.

Left click to complete the line.

Now to draw a vertical line, drag the cursor vertically downwards.

Left click to complete it.


Now draw a horizontal line to the right to connect it to the circle.

Point to the top horizontal line.

Select the top horizontal line.


Select the Constrain horizontal distance tool from the tool bar.


In the Insert length dialog box, set the length to 80 mm and click ok.

Let us set the length of the top horizontal line to 80 mm.


Click on the line, and click the Constrain horizontal distance tool.


Change the length to 80 mm.

Select both the horizontal lines.


Select the Constrain equal tool from the toolbar.

Now select both the horizontal lines and select the Constrain equal tool.


Constrain equal tool is used to make two or more drawings of equal size.

Select the vertical line.


Select the Constrain vertical distance tool from the tool bar.


In the Insert length dialog box, set the length to 30 mm and click ok.

Now select the vertical line.

Set its length to 30 mm using the Constrain vertical distance tool.

Select the Trim edge tool from the tool bar.


Select the circumference of the outer circle between the horizontal lines.

Now select the Trim edge tool.


Trim edge tool is used to delete a line or curve between two intersection points.


Select the arc of the outer circle that is between the horizontal lines to trim it.

Click close in the Combo view. Now click Close in the Combo view.
Select the view to Top using the Gizmo. Select the top view using the Gizmo.
Go to the Model tab.


Select the sketch.

Go to the Model tab and select the sketch if not already selected.
Select the Pad tool from the tool bar.

Pad Parameters dialog box opens in the Combo view.

In the Combo view, set the length to 30mm.


Tick the Symmetric to plane check box.


Click OK.

Now select the Pad tool from the tool bar.


In the Combo View, under Pad Parameters change the length to 30 mm.


Also tick the Symmetric to plane check box.


Now click the OK button.

Place the cursor on the center of the drawing.


Press and hold the middle mouse button.


Right click and drag the cursor to the right.

Now let us rotate the drawing.


Place the cursor on the centre of the component.


Press and hold the middle mouse button.


Right click and drag the cursor to the

right.

Select the Create a datum plane tool from the tool bar. Now select the Create a datum plane tool from the toolbar.


It is used to create a new plane to draw the components.

Select the back end face of the square.


Click ok in the Combo view.

Now select the back face of the square, to set it as a reference.


Then click OK in the Combo view.

Shows the plane. You can see that a plane appears at the bottom of the component.
Select the datum plane from the model tab.


Select Create sketch from the tool bar.

Select the datum plane from the Model tab if not selected.


Now select Create sketch.

Select the arrow near the Create regular polygon tool.


Select the octagon.

Now select the arrow near the Create regular polygon tool.


It is used to draw different polygons.


In the drop down, select Octagon.

Place the cursor in the middle of the plane.


Left click and drag the cursor.


Adjust the octagon so that the sides of the octagon are parallel to the background square.


Left click on your mouse.

Now place the cursor in the middle of the plane.


Left click and drag to see a model drawing.


Adjust the octagon to make its sides parallel to the background square.

Now left click again to complete the octagon.

Select the left side line.


Select the Constrain vertically tool from the tool bar.

Select the left side line of the octagon.

And select the Constrain vertically tool from the toolbar.


This makes the side vertical.

Select the left side of the octagon and the midpoint of the plane.


Select the Constrain distance tool from the tool bar.


In the Insert length dialog box, enter the length as 15mm and click ok.

Select the left side line of the octagon and the midpoint of the plane.


Select the Constrain distance tool from the toolbar.


In the Insert length dialog box, set the length as 15 mm and click OK.

Click Close in the Combo view. Observe that the octagon is perfectly placed.


Click Close in the Combo view.

Select the sketch in the model tab. Now select the sketch if not selected.
Select the Pad tool from the tool bar.


In the Length field, enter 40mm and click ok.

Select the Pad tool from the tool bar.


Change the length to 40 mm and click OK.

Select the datum plane in the combo view.


Press the Space key.

Select the datum plane in the Combo View and press Space bar.

This hides the plane.

Select the component.


In the Property tab, go to Data tab.


Under Part Design change the Refine, value to True.

Now select the component.


In the Property tab, go to Data.


Under Part Design change the Refine value to True.

Click on a blank space. Now click anywhere in the blank space to deselect the component.
Select Create a datum plane tool from the tool bar.


Select the bottom face of the octagon and click ok.

Now select Create a datum plane tool from the tool bar.


Select the bottom face of the octagon and click OK.

Select the datumplane in the model tab.


Select Create sketch tool from the tool bar.

Now select the datum plane from the Model tab if not selected.


Now select Create sketch.

Select the Create circle tool from the tool bar.


Place the cursor in the middle of the plane.


Left click and drag to draw a circle.


Left click again to complete it.


Select the circle.


Select the Constrain radius tool from the tool bar.


In the Insert radius dialog box, enter the radius as 12.5mm and click ok.


Click Close in the Combo view.

Select the Create circle tool from the tool bar.


Draw a circle from the middle of the plane.


Using the Constrain radius tool, let us set the radius as 12.5 mm.


Then click Close in the Combo view.

Select the sketch from the model tab.


Select the Pad tool from the tool bar.


In the Combo view, change the length to 25mm and click ok.

Now select the sketch if not selected.


Select the Pad tool from the tool bar.


In the Combo view change the length to 25 mm and click OK.

Select the datumplane from the combo view.


Press the Space key in the keyboard.

Now select the datum plane in the Combo view and press Space bar to hide it.
Click on a blank space. Now click anywhere in the blank space to deselect the component.
Select the Create fillet tool from the tool bar.


Select the intersection line between the ring shape and the rectangle.


Rotate the drawing.


Select the other intersection line between the ring shape and the rectangle.

Now select the Create fillet tool from the toolbar.


Select the intersection line between the ring and the rectangle.


Repeat it for the other side also.

In the Combo view, change the radius to 24mm.


Click Ok in the Combo view.

In the Combo view under Fillet parameters, two edges are shown.


In the Radius field change the radius to 24 mm.


Then click OK.

Select the Create fillet tool from the tool bar.


Select the diagonal intersection line in the corner between the rectangle and the octagon.


Rotate the drawing and select all four lines.

Again select the Create fillet tool from the toolbar.

When an octagon is drawn inside a square, four triangular edges are formed.


We have to smoothen these triangular edges.


Let’s rotate the drawing and select all the triangular edges as shown.

Point to the Combo View Fillet Parameters window.


Point to the edges shown in the Preview.

In the Combo View Fillet Parameters window opens.


In the Preview all the four selected edges are shown.

In the Combo view change the radius to 3mm and click ok. In the Radius field change the radius to 3 mm and click OK.
Only narration. You can now see that the component is ready.
Go to file.


Click save.


In the save dialog box, type the appropriate name and click save.

Now let us save the file with an appropriate name.
Only Narration With this we come to the end of this tutorial.


Let us summarize.

Slide 5

Summary

In this tutorial, we have learnt to,
  • Draw an eye end part of the Knuckle joint using Sketcher tools.
Slide 6

Assignment

As an assignment,

Draw a joint pin as shown in the figure.


Slide 7

About spoken tutorial project

This video summarizes the spoken tutorial project.

Please download and watch it.

Slide 8


Spoken tutorial workshops

We conduct workshops using spoken tutorials and give certificates.


Please write to us.

Slide 9

Forum questions

Please post your timed queries in this forum.
Slide 10

Acknowledgement

Spoken tutorial project was established by the ministry of education government of India.
Slide 11

Thank you

This tutorial is contributed by Dr. Sathiya Narayanan and K.Sakthivel.


Thank you for joining.

Contributors and Content Editors

Madhurig

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