This tutorial exercise provides step by step instruction on creating a hubless spur gear. Follow the steps shown below.

 

Step One

Open CATIA by double clicking the Icon which would be in your desktop if you are using Windows and believe it to be the same for UNIX also. The screen would be as in Figure 1.

Figure 1.

 

Step Two

Click File menu from top of your screen and click new file option from the menu list as shown in Figure 2.

Figure 2.

 

Step Three

Then a small dialogue box appears as shown in Figure 3. Select part from the list and click OK. Then a default part with name part1 is opened.

Figure 3.

 

Step Four

Select “yz plane” from specification tree as shown in Figure 4.

Figure 4.

 

Step Five

Select “Sketcher” workbench by clicking the icon as shown in Figure 5.

Figure 4.

Step Six

Now let us select “Circle” tool by clicking the icon as shown in Figure 6 or select from Insert > Profile > Circle > Circle menu Figure 7.

Figure 6.

Figure 7.

 

Step Seven

Draw a circle as shown Figure 8.

Figure 8.

 

Step Eight

Now select “Constraint” tool by clicking the icon in the tool bar as shown in Figure 9.

Figure 9.

 

Step Nine

Now just click on the circle and the diameter of the circle would be displayed as shown in Figure 10. When you double click on the diameter value “Constraint Definition” dialogue box appears where you can see present diameter value as shown in Figure 11. Now let us change the value of diameter to 100mm and click ok, as shown in Figure 12.

Figure 10.

Figure 11.

Figure 12.

Step Ten

Create one more circle inside the present one and set it’s diameter to 194mm as shown in figure 13.

Figure 13.

 

Step Eleven

Exit "Sketcher" workbench by clicking the icon in toolbar as shown in Figure 14.

Figure 14.

 

Step Twelve

Select “Pad” tool by clicking the icon in the toolbar as shown in Figure 15 or go to Insert > Sketch-Based Features > Pad menu and select pad tool as shown in Figure 16.

Figure 15.

Figure 16.

Step Thirteen

When “Pad Definition” dialog box appears after selecting pad tool enter the values as shown in Figure 17 and click ok.

Figure 17.

 

Step Fourteen

The resultant part would be as shown in Figure 18.

Figure 18.

 

Step Fifteen

Select “Fillet” tool by clicking the icon in toolbar as shown in Figure 19 or go to Insert > Dress-Up Features > Edge Fillet menu and select “Fillet” tool Figure 20.

 

Figure 19.

Figure 20.

Step Sixteen

When “Edge Fillet Definition” dialog appears select four edges and enter 4mm as radius as

shown in Figure 21 and click ok.

Figure 21.

 

Step Seventeen

Select “yz plane” from specification tree as shown in Figure 22.

Figure 22.

 

Step Eighteen

Select “Sketcher” workbench by clicking the icon as shown in Figure 23.

Figure 23.

 

Step Nineteen

Now let us select “Line” tool by clicking the icon as shown in Figure 24 or select from Insert > Profile > Line > Line menu as shown in Figure 25.

Figure 24.

Figure 25

Step Twenty

Draw a sketch as shown in Figure 26.

Figure 26.

 

Step Twenty One

Exit “Sketcher” workbench by clicking the icon in toolbar as shown in Figure 27.

Figure 27.

 

Step Twenty Two

Select “Pocket” tool by clicking the icon in toolbar as shown in Figure 28 or go to Insert > Sketch-Based Features > Pocket menu and select “Pocket” as shown in Figure 29.

Figure 28.

Figure 29.

 

Step Twenty Three

When “Pocket Definition” dialog box appears select “Sketcher.4” as profile and enter 20mm depth of pocket as shown in Figure 30 and click ok.

Figure 30

Step Twenty Four

Select “Pocket.1” from specification tree as shown in Figure 31.

Figure 31.

 

Step Twenty Five

Select “Circular Pattern” tool by clicking the icon as shown in Figure 32 or to go Insert > Transformation Features > Circular Pattern menu and select the tool as shown in Figure 33.

Figure 32.

Figure 33.

 

Step Twenty Six

When “Circular Pattern Definition” dialog box appears enter the parameters as shown in Figure 34.

Figure 34.

 

Step Twenty Seven

Resultant spur gear with out hub would be as shown in Figure 35.

Figure 35.