Incorrect thread representation in drawing view

- March 31, 2022 at 10:32 am
  
  Marco Ugolotti
  Subscriber
  
  🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions
  
  Hello,
  
  on some geometry in 2D view outer thread are not represented correctly.
  
  As you can see in below image some lines are missing in several view.
  
  I already tried to create a new design with a new model, but also in it the drawing view problem is present.
  
  After some test it seems to be related to the chamfers on the edges where the thread is applied.
  
  Attached you can find the file of example.
  
  Can you verify the cause of this behaviour and how to obtain the correct representation?
  
  Thank you in advance,
  
  Regards,
  
  Marco Ugolotti
- March 31, 2022 at 11:14 am
  
  Devendra Badgujar
  Forum Moderator
  
  Hello Marco Ugolotti
  
  Let me check and get back to you on this.
  
  Regards.
- March 31, 2022 at 2:13 pm
  
  Devendra Badgujar
  Forum Moderator
  
  Hello Marco Ugolotti
  
  I am checking this with the developer to see what is causing this behavior.
  
  This issue seems to be when the Display option is set to Hidden Line Removed and Hidden line. Please try using Wireframe display in the meantime where those missing lines are visible.
  - March 31, 2022 at 4:43 pm
    
    Marco Ugolotti
    Subscriber
    
    🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions
    
    Thank you Devendra Badgujar for your quick answer.
    I've already noticed that in wireframe mode all lines are visible, but, as you can simply imagine, for complex drawing wireframe cannot be used.
    
    I attach another example to highlight a "strange" behaviour: changing chamfer dimensions and body rotation the lines shown are different
    
    body rotate of 45°
    
    Best regards,
    
    Marco
  - April 1, 2022 at 5:22 am
    
    Devendra Badgujar
    Forum Moderator
    
    Marco Ugolotti
    
    I will check this and get back to you with more information.
- April 4, 2022 at 7:19 am
  
  Devendra Badgujar
  Forum Moderator
  
  Hello Marco Ugolotti
  
  I checked with the development team and they said that it is a bug inside Hidden Line engine. Depending on the model orientation, Hidden Line Removed outputs incorrect edge classification (visible vs hidden)
  
  A possible workaround is to try different thread display standard (so that thread display will look consistent).
  
  I attach another example to highlight a "strange" behaviour: changing chamfer dimensions and body rotation the lines shown are different
  
  This is the same issue with the Hidden Line engine.