First,I must draw out a pipe.Then must set the polygon pipe options>apply>drag to make it bigger/fit the size you want.
Next,right-click on mouse button > chose face, This results the surfaces to turn peach or brown in color when your mouse hover over it.
Next,by selecting the surfaces,we need to hold the shift key and drag the surface we want to select.
After making sure we have selected the right surfaces. We need to check all faces inside/below the pipe to see if we have accidentally selected the unnecessary . If so, we have to press shift+click to deselect it.
Follow by creating the teeth of the gear.we need to go to Edit polygons>Extrude face
The extrude manipulator appears (:
This allows us to perform transform operations on the extruded faces.
Remember transform means translate,rotate and scale.(you can see the red arrow,blue and green arrow)(The X,Y and Z axis)
By clicking on the green arrow we shrink the surface into a smaller rectangle
Then follow by clicking the red arrow moving towards center.It became a square. Example in the screenshot.
Finally, the blue arrow(Z axis). We need to pull out the surfaces. Gear is form ! ;)
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