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Help needed creating a hidden Bayonet fitting inside a tubular cylinder

john_smith077john_smith077 Member Posts: 109 ✭✭
edited February 2016 in Community Support

Can anyone give me any helpful pointers as to how to tackle this? 

I am trying to create a sort of 'bayonet fitting' inside a cylinder. (In fact more of a double-bayonet)
i.e. I need to cut a trench into the inside surface of a cylinder. This trench would include both verticals and diagonals, and would be for a stud to track along.  

VERY roughly it would look something like this:

I'm not sure where or how to start!
i.e. I don't know how to cut a trench parallel to a curved surface... 

e.g. Are there parts of any videos I should watch?

Many thanks


EDIT: I have annotated screenshot further. Hopefully now slightly clearer...


  • øyvind_kaurstadøyvind_kaurstad Member Posts: 234 ✭✭✭
    Your drawing of the shape inside the cylinder isn't very clear. If you need just right angles of the cut, then you can use various methods to make the cuts. For the cuts travelling radially, you can sweep cut a sketch (or perhaps split the face with a sketch and use thicken remove). For the cut(s) travelling along the cylinder axis, you can extrude remove a sketch that has the size of the profile of your stud.

    If you need your inside cylinder to rotate while translating in/out of the cylinder, then you need to sweep a profile sketch along a helix, as outlined in this thread: https://forum.onshape.com/discussion/comment/14958#Comment_14958

  • john_smith077john_smith077 Member Posts: 109 ✭✭
    edited February 2016
    My apologies for the poor quality of my original explanation.

    The  'trench' in the above diagram has vertical sections and diagonal sections. It needs to track around the inside surface of the female part staying at a consistent depth as measured from the curved inside surface of the Female part.

  • øyvind_kaurstadøyvind_kaurstad Member Posts: 234 ✭✭✭
    Ok, much clearer now. You do need to use the methods outlined in the thread I linked to. You need to create two helices, one for each of the diagonal sections of the slot inside the cylinder. The vertical section is easy enough, as you have already done one in your example.
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