SoliForum - 3D Printing Community — Ahhh, circular functions makes my head hurt!

Re: Ahhh, circular functions makes my head hurt!

2015-06-24T20:37:09Z

Oh, and the bottle I was looking at was a 28mm bottle, so ignore my 3 threads business.

Re: Ahhh, circular functions makes my head hurt!

2015-06-24T20:36:40Z

I never really used FreeCAD except to poop around on it and see if I liked it.

Bottle cap thread sizes are set by the International Society of Beverage Technologists. http://www.threadspecs.com/threadspecs-downloads.asp lists all the different thread specs. If it's an 18mm diameter than it's probably SP400. Here's the spec sheet!

http://www.threadspecs.com/assets/Threadspecs/sp400.pdf

Re: Ahhh, circular functions makes my head hurt!

2015-06-24T17:37:30Z

Hi TheBaron, so how Do I set pitch & length??

Re: Ahhh, circular functions makes my head hurt!

2015-06-23T21:30:43Z

Remember, with bottle caps you actually have 3 separate threads, not just one thread making 3 turns. I don't know much about freecad, but I know my bottle threads

Ahhh, circular functions makes my head hurt!

2015-06-22T21:47:33Z

I know there are a huge number of gear generators , but I'm trying to learn the basics. In the images I have a bottle top I figured it's a 3.6 mm pitch, 18.5 mm radius, and each length is about 38mm, but I can't get the right twist so I get three individual helix at the right hieght in freecad. Can someone with a bigger brain help?