I am designing a molded cap for a sports bottle. I am looking for the physical dimensions of a 28mm bottle thread. Any suggestions where I can find those dimensions?
Hes aiming a sport bottle so it's surely not a SP-400 thread. SP-400 are mainly for pills bottle, sauce bottle and so on. A sport bottle for me is a bottle that can be opened in a quarter turn of the cap.
Well, the project continues on.
We did design a 28mm cap but that was for a soda bottle.
Now we are onto a 27mm bottle cap for water. This is truly the sports type cap. Weisco is correct. It has a triple lead thread and opens on about a 1/4 turn.
Sorry to crash this thread. Im a product designer and usually I get a rough model to take to a mold designer, but I have a project for a bottle that will be produced in china and the client wants me to get the CAD files as close to finished as possible. Any suggestions on where I can get a crash course on designing injection molded threads?
Assuming you're using a good 3d CAD package it shouldn't be too much trouble to model the thread accurately. I know ProEngineer has some good tutorials for modelling threads as does Solidworks.
Next step is the actual design. Would recommend looking up the SPI standards and those available at the Closure manufacturers. See above messages for the links.
Finally if all else fails, if you've got an actual bottle thread that you like grab some verniers/calipers and measure them directly.
PS. Word of warning for making anything in China (or anywhere for that matter)...check the mould drawings/cad as I've seen instances where they haven't taken shrinkage into account and have machined plastic molds directly from supplied CAD files. It should be the tool-maker's responsibility but always worth checking...
I understand where you're coming from. You're looking for the phsyical dimensions to model in the thread. What I found out since starting this thread is that most molded bottle threads are proprietary to the manufacturer of the bottle. There are some standard dimensions. You can get those at the website that Wiseco menstioned above.
I'm interested in making a cheap product that uses used 2 liter soda bottles. Which thread is that? Would any standard pipe fitting be a close enough match?
I'm interested in making a cheap product that uses used 2 liter soda bottles. Which thread is that? Is that a 28mm 400? Would any standard pipe fitting be a close enough match?
I have to design a custom cap. On your post above for a 28mm -400 bottle, you call out the dimensions for the OD of a bottle thread. I was wondering how you would call out the ID for a cap? Is there a standard someplace? The bottle thread that i need is 58-400.