1 Topic by lueman

  • lueman
  • lueman
  • Member
  • Offline
  • Registered: 2014-05-28
  • Posts: 97

Topic: Ahhh, circular functions makes my head hurt!

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?

Post's attachments

CAM00741.jpg
CAM00741.jpg 106.89 kb, file has never been downloaded. 

CAM00742.jpg
CAM00742.jpg 104.94 kb, file has never been downloaded. 

CAM00743.jpg
CAM00743.jpg 100.24 kb, file has never been downloaded. 

You don't have the permssions to download the attachments of this post.
SD4 with E3D V6.

Those who don't know ask, those who don't care comment,  those who comment without answers  hide ignorance for fear of asking. Be fearless!

2 Reply by TheBaron

  • TheBaron
  • TheBaron
  • Member
  • Offline
  • From: Chicago, IL
  • Registered: 2013-07-19
  • Posts: 340

Re: Ahhh, circular functions makes my head hurt!

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 big_smile

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)

3 Reply by lueman

  • lueman
  • lueman
  • Member
  • Offline
  • Registered: 2014-05-28
  • Posts: 97

Re: Ahhh, circular functions makes my head hurt!

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

SD4 with E3D V6.

Those who don't know ask, those who don't care comment,  those who comment without answers  hide ignorance for fear of asking. Be fearless!

4 Reply by TheBaron

  • TheBaron
  • TheBaron
  • Member
  • Offline
  • From: Chicago, IL
  • Registered: 2013-07-19
  • Posts: 340

Re: Ahhh, circular functions makes my head hurt!

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

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)

5 Reply by TheBaron

  • TheBaron
  • TheBaron
  • Member
  • Offline
  • From: Chicago, IL
  • Registered: 2013-07-19
  • Posts: 340

Re: Ahhh, circular functions makes my head hurt!

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

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)