MODELING BOTTLE NECK FINISH THREAD

Edgar Gidoni

13 Jun, 2021 10:55 AM

This is about acurate modeling of threads in a bottle neck finish.
Sometimes we just model an approximation of the thread. But from a strictly technical point of view, this is a correct way to do it.

A talented beginner, following the steps indicated here, can do this modeling.

I hope you enjoy this, and that it is useful for you.

1. Step 1: Let's begin! Base cylinder

   See also: https://grabcad.com/library/accurate-modeling-of-neck-finish-1

   For the SLDPRT files.

   Just model a cylinder like this one. If you have a bottle model, just begin on the top of the bottle, otherwise, for the purpose of this tutorial, the cylinder is enough.

   
   

   
   

   
   

   • By the way: SK means Sketch, RP Right Plane, PM Property manager, FMDT Feature Manager Design Tree, and so on...

   
   

   

2. Step 2: Plane for base of helix

   Preliminary Steps to draw the Helix Curve for the Thread:.

   
   

3. Step 3: Helix Curve

   For a 2 mm Pitch with 2 turns...

   

   

   
   

   
   

4. Step 4: Thread Profile (Sketch)

   This profile is from an actual bottle we made for a client.

   

5. Step 5: Modeling Thread with Sweep

   Now we use the Sweep Comand to generate the main body of the thread

   It is very important that you DO NOT MERGE with the cylinder.

   

   
   

   
   

6. Step 6: The Main Trick...

   Now we are going to prepare the thread for the two end caps in the proper angle.

   
   

   
   

7. Step 7: Cutting the First End Cap

   And now we are going to cut the ends of the main helical thread.

   Make sure that you do no cut the entire helical body, just the end of it.

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8. Step 8: Cutting the Other Cap End

   Just do the same fot the other cap end...

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9. Step 9: Sk for the First End Cap

   Now, using the last face created with the cut, let's draw this Sk.

   
   

   
   

10. Step 10: Generating the First End Cap

    Again, DO NOT MERGE the results!

    

    
    

11. Step 11: Generating the Other End Cap

    You are almost there!...

    
    

12. Step 12: Final Step!

    Finally, combine all the bodies: Cylinder, Main Thread, End Caps.

    And you did it. Congratulations!!

    

    

    
    

13. Step 13: Final Words...

    If you liked this tutorial, just check us in

    https://grabcad.com/edgar.gidoni-1/models

    
    

    And for more on the topic, please chek:

    https://grabcad.com/library/accurate-modeling-of-neck-finish-1

    
    

    And let us know if you want more like this.

    
    

    CIAO (bye) and see you soon!