threads

[quinterow]

Dear colleagues,



Is there anyone modeling plastic bottle threads?



How are ends of threads modeled?



Thx.

 

[adicar01]

for end of thread you can:

- simple rounded

- create a revolve surface (and after that tweak replace the surface is not necessary to be fit on you end of thread- only bigger).

- create one complex shape sweep-blend

first of all think in technological way, how will be maded that end of thread (ask you programmer/technologist or your mould maker)

 

[BobP]

The threads are cut in the mould using a rotating cutter, so the shape on the end of the thread is generated by the cutter as it starts or ends it cut. Its almost elliptical in shape. Heres how I do it (from memory)....



Use a protrusion revolve and choose the end of the helix thread as the plane for sketching. Use the existing helix thread form as references and sketch the thread form. Put a revolve centreline at half the cutter diameter and revolve say 90 degrees and its done.