Tutorial - Making a helical gear in AutoCAD?

Sudhir Gill

7 Feb, 2012 07:03 AM

Here is the tutorial

1. Step 1:

   Start AutoCAD.
   

   

2. Step 2:

   Make a circle of 35mm radius at center.
   

   

3. Step 3:

   Make another circle of 50mm concentric to previous one.
   

   

4. Step 4:

   Make two arcs like this one for cutting teeth.
   

   

5. Step 5:

   Trim down the circles. Now enter PEDIT command.
   

   

6. Step 6:

   Right click on the screen and select multiple.
   

   

7. Step 7:

   Select all arcs.
   

   

8. Step 8:

   Press enter and keep the input Y and press enter.
   

   

9. Step 9:

   Now click on the join.
   

   

10. Step 10:

    Press Enter.
    

    

11. Step 11:

    Now we can see that it has become a polyline.
    

    

12. Step 12:

    Enter helix command.
    

    

13. Step 13:

    Enter the radius value of (0,35). Any other value will distort the sweep. Keep the default value for the upper radius. Press Enter.
    

    

14. Step 14:

    Now select turns and enter a value of 0.15.
    

    

15. Step 15:

    Now enter a height of 50mm. We have helix path generated which will later be used for cutting the teeth.
    

    

16. Step 16:

    Create a circle of 50mm with origin as center.
    

    

17. Step 17:

    Extrude it by 25mm.
    

    

18. Step 18:

    Enter SWEEP command.
    

    

19. Step 19:

    Select the polyline to sweep and press enter.
    

    

20. Step 20:

    Right click and select alignment.
    

    

21. Step 21:

    Select No.
    

    

22. Step 22:

    Again right click and select twist.
    

    

23. Step 23:

    Keep the default values and press enter. Now select the helix as the sweep path.
    

    

24. Step 24:

    We have one cut body generated.
    

    

25. Step 25:

    Now enter array command.
    

    

26. Step 26:

    Select array type polar and enter origin as center for array. Click select object and select the sweep. Now enter the no. of items be 10. Click OK.
    

    

27. Step 27:

    Subtract the arrayed sweeps from the cylindrical body and we have the helical gear created.