Monday, September 19, 2011

018 Spur Gear Parametric Modeling

In this tutorial, a spur gear is parametrically modeled using Parameters and Relations in Catia. The gear involute is initially modeled using the generative surface design. This tutorial is entirely based on a web page http://gtrebaol.free.fr/doc/catia/spur_gear.html . All what I added here were the videos showing in detail how to model the gear.
The gear is modeled using the following steps:
  • The parameters are defined which are:
    • z : no. of Teeth
    • m: modulus
    • a : pressure angle
    • rp: pitch circle radius
    • ra: addendum radius
    • rb: base circle radius
    • rf: root circle radius
    • rc: corner radius
  • The relations are defined which are the parametric equations for the tooth involute:
    • Yd
    • Zd
  • The points for drawing the tooth involute are defined and a spline is drawn following these points. rotation angle is applied for the ease of modeling.
  • The addendum circle and the root circle are drawn.
  • The root corner is created.
  • Using the split tool, the extra parts of the circles are removed.
  • Using the join tool, the tooth parts are joined together.
  • Using the circular pattern, the tooth is repeated in a full crown, where the angle of repetition is 180 deg devided by the no. of teeth.
  • Shifting to the part module, extrusion is done.
  • Again, this tutorial is entirely based on this webpage http://gtrebaol.free.fr/doc/catia/spur_gear.html
  • At the end, some manipulation is done to test the effect of changing the parameters on the shape of the whole gear.

Here are the two videos showing the modeling of the gear:


Posted by Unknown at 11:53 PM

8 comments:

  1. UnknownMarch 26, 2012 at 10:36 PM

    This comment has been removed by the author.

    ReplyDelete
  2. UnknownMarch 26, 2012 at 11:22 PM

    I'm fairly new to CATIA, i was actually going crazy the past few days, i found this tutorial http://gtrebaol.free.fr/doc/catia/spur_gear.html and i followed it but i had a problem with the corner between the Extrapolate and the Circle, i had an error and i've been searching for a solution for it but couldn't find one, eventually i found your tutorial and i knew what the problem was, i made the Spline from the lowest point to the highest and then Extrapolated the lowest point and the Spline while i should've made the Spline from the highest point to the lowest :D
    Thank you so much.

    ReplyDelete
    Replies
    1. UnknownMarch 27, 2012 at 12:15 AM

      Nehad,

      I am very happy :) that you finally got what you were looking for.
      All the credit goes to the original author: http://gtrebaol.free.fr/doc/catia/spur_gear.html

      Hope you also enjoy the rest of the tutorials.

      Hazem

      Delete
    2. BAKKIYARAJ.VMay 7, 2013 at 11:42 PM

      I am also having same problem. Kindly help to solve the problem.

      Delete
  3. mukund baigerMay 18, 2012 at 6:28 PM

    thank you sir!!!!!!!!!

    ReplyDelete
    Replies
    1. UnknownMay 20, 2012 at 3:58 AM

      Mukund,

      Not at all :) , I hope you also enjoy the rest of Catia tutorials found in the archive.

      Regards,

      Hazem Khalaf

      Delete
  4. AnonymousOctober 14, 2012 at 7:29 PM

    Excellent work Hazem,

    I am new to CATIA and I am using V5R19. Some things seem to work differently so I was wondering from what version of CATIA this gear tutorial was made. Also I have a few questions but will not ask (yet)unless I know you are still around.
    Anyway, nice work on the tutorial.

    ReplyDelete
    Replies
    1. UnknownOctober 15, 2012 at 11:16 PM

      Thank you Sir,

      I think by that time, I did it using V5R19 and you can also do it using V5R18 as well, it is not that different at least for the commands used in this tutorial.

      I am still around :) , but did not add anything recently due to being busy at work.

      Hope you find the rest of the tutorials quite useful,

      Regards,

      Delete

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