Hello friends I will show how create a 3dsmax 3d gear model tutorial.
I have used following techniques shown below in this 3ds max tutorial.

[1]-First of all you will press (ctrl +N) now you will see the new window is open
    Click on the Star button and create a star with the following size  

[2]-Apply the Extrude Modifier with the (Amount: 15.0)

[3]-Create a cylinder with the following size
    Now set like this

[4]-Select the Star with Boolean the Cylinder like this

[5]-Now your object should like this

[6]-Create a Tube with the following setting

[7]-Now apply the Taper Modifier and use the following setting

[8]-Now your object should like this

[9]-Create capsule in the top view port and apply the FFD modifier now select the control point
     Drag the control point like this in the front view port

[10]-Create sphere like this

[11]-Create legs with the help of cylinders and chamfer boxes

[12]-Create one more cylinder and apply FFD modifier select the control point now drag the control point like this

[13]-This is my material palette and creates materials some thing like that

[8]-Set the skylight like this with the following parameter

[9]-This is my final result are you looking it

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