Tutorial: how to model '' a gear '' in '' solidworks '' and show design intent

Tutorial by Tarek Zemri

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  1. Step 1:

    01) File, new, part, ok

  2. Step 2:

    02) Tools, equations, add these parameters and equations as shown
    m= 6 (module)
    z=20 (teeth number)
    p= m*pi (pitch)
    d=m*z (primitive diameter)
    da=d+2*m (head diameter)
    df=d-2*m (foot diameter)

  3. Step 3:

    03) Sketch, select front plan and draw a circle than
    replace the dimension by “=” choose “da” (Rq, this is the same procedure for the rest.)

  4. Step 4:

    04) Fuction, extrude, 25 for the thikness

  5. Step 5:

    05) A new sketch in the front face than add 3 circles and in the dimension box write “=” and chose :
    The first circle: “df” the 2nd “d” the third “da”.

  6. Step 6:

    06) Add 2 centerlines and mirror the 3rd one
    Rq: Be sure that the end of the middle centerline coincide with the “d” circle.

  7. Step 7:

    07) Add an arc in as shown be sure always that the entities hang in the good positions.
    The center in the “df” circle and and the ends on “da” and “df”
    - Mirror it twice ( reference to the two centerlines)

  8. Step 8:

    -Add radius for the arc r=35mm,
    - and for the pitch use “=p”.
    - and a relation between the arc and the point of the center line.

  9. Step 9:

    When the sketch is fully defined (black), extrude cut and select the two contours.

  10. Step 10:

    Use the circular pattern function and for the number of instance write “=” chose “z”

  11. Step 11:

    And this is the result:

  12. Step 12:

    And now our goal is here to show the result of using the design intent ^^:
    (tools, equations) We change the value of “m=9” and “z=28” for example.

  13. Step 13:

    If you enjoy this tutorial be positive and click “it worked” and “like”


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    Tarek Zemri

    Alejandro Padron, thanks.

    September 10th, 2017 11:05
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    Alejandro Padron

    This is a well illustrated tutorial thanks!

    September 10th, 2017 02:05
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    Tarek Zemri

    Zeke, you're welcome

    August 29th, 2017 08:13
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    Zeke Levin

    Thanks! I needed this to design a planetary gearbox, and this tutorial was super helpful.

    August 28th, 2017 17:07