There wasa good tutorial on this on SolidProfessor.com in one of the tips series - I think if you pay $25 you can access the archive for 12 months. If not the process is actually simple. I'm not at a SolidWorks machine right now so I can't post a file but the process is:
1. Model the cap and the bottle neck as revolves (draft etc is up to your own needs)
2. Create reference planes offset from the top of the bottle and the bottom of the cap.
3. Create sketches on these planes which reference the surfaces of the neck and the inner face of the closure.
4. Create a Helix curve on the neck surface and on the closure inner surface (pitch the same, direction the same, turns depends on the application).
5. Create reference planes on each helix at the end point normal to the helix curve (Reference Plane>Normal to Curve>Set origin on curve).
6. Create new sketch on these planes and draw the thread profile - make sure you go INSIDE the neck or closure solid by about 0.1mm - do not rely on a reference to the neck surface.
7. Sweep the thread profile sketches along the helix - TURN MERGE OFF!
8. For the lead in and out the easiest way is to create a new sketch on the end face of the swept solid. Reference the edges of the face and revolve this around a line maybe 6mm inside the form so the revolve follows a path to the inside of the neck or to the outside of the closure.
9. If needed do the same at the other end.
10. Create a revolve cut and trim off the lead ins and outs (assuming the bottle next or closure is thin walled - if solid you can miss this step)
11. Combine ADD the helix sweeps with leadin/out to the neck or closure
12. Add a small fillet on the interface of the thread and closure/neck surface
All sound more complex than it is. Like I said, SolidProfessor did a 2 minute video of this about a year ago.
In terms of standards, well, there are standards for beverage bottles, plastic bottles, glass bottles, standard ISO, as well as bespoke standards by manufacturer.
There are certain types of threads that are better suited to plastic bottles and certain better for glass.
The general process is to find the closure you need first, contact the manufacturer and ask them for specifications of neck thread required to work with those closures. If the closure is non standard then you can do what you like.
I can't really give specific advice but you could try this:
Hope this helps.
As for thread standards, try:
but the documents require membership which at a glance isn't cheap. Apparently there are standards available for purchase but many bottle caps are non-standard proprietary designs. If you are just having fun, drag one out of the trash and measure it. If you are designing for a client be careful not to copy a patented or trademarked design.
Sorry to sound redundant - looks like we were thinking along the same lines Kevin...
solidworker.com has a good video on making threads match
Do any of you have a Model of a 28-400 SP finish bottle cap? If so, can you upload or sent it to me by email?
I have checked some of the closure company websites, but did not see any CAD models to download.
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