# Tutorial - Making a helical gear in AutoCAD?

Here is the tutorial

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.

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.

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.