The article notes that most bottle threads are standardized. It links to a calculator that has presets for the standards and also allows the user to enter measured threads if needed. Bottle cap thread calculator
I tried using some of the presets with ThreadProfile workbench (just set the pitch and diameter after adding a helix and V thread profile) and with good results (this one is 5 threads of 13-SP415):
ThreadProfile_bottles.png (118.34 KiB) Viewed 2231 times
Star Trek II: The Wrath of Khan: Spock: "...His pattern indicates two-dimensional thinking."
drmacro wrote: ↑Mon Jul 13, 2020 11:53 am
Umm...my point wasn't that my example created anything usable, but that the resource of standard for bottle thread values was useful.
After researching this a bit more I see there are 2 types of profiles, "L" and "M". The L profile is similar to a v thread, but 30 degrees and a rather blunt tip. The M profile is a buttress type profile 45 degrees on one and 10 degrees on the other. The ThreadProfile Buttress profiles use 45/7 degrees.
drmacro wrote: ↑Mon Jul 13, 2020 11:53 am
Umm...my point wasn't that my example created anything usable, but that the resource of standard for bottle thread values was useful.
I updated the workbench to add some support for bottle threads, the m style 45/10 buttress threads. You might have to flip the threadprofile object around depending on how you want the buttress threads oriented. The only sample I have to test against is the one I found on thingiverse. That one seems to be bang on, but I don't know about the other preset sizes.
