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Is there a formula or basic guide line to breaks in each thread on a bottle & cap? (variable helix)

By SCOTT on 28 Sep 23:36 2 answers 289 views 0 comments

I designed a variable 2.5 rev. helix sweep (extruded on the cap and bottle).
.3 inch pitch on 1st revolution starting from the bottom going up
.09 inch pitch on the remaining rev's.
I used a continuous sweep with no breaks in the threads.
But every bottle & cap I looked at has breaks at certain degrees of each revolution.
Is there a formula or basic guide line to these breaks in each thread?

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CAP START 3.SLDPRT, 2 MB
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2 answers

  • Brett
    Brett almost 2 years ago

    The breaks in a bottle caps threads are there to allow venting of the bottle as you remove the cap. There should be no set degree of revolution, gap or number required, and will vary by manufacturer.

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