thread in concentric cylinders

[Anonymous]

I have a problem like this. I have a cylinder with a diameter of 40 mm and an external cylinder which must be screwed on the previous one. The fillet should not be on the whole cylinder, but only on one side ... for example 1 cm.
The thread, however, digs the inner cylinder, while the thread of the hollow cylinder overlaps the section in this way if I print them with the 3D printer, although they are admissible it is impossible to make the graft ... I should do the opposite. It's possible?

[KKizildemir]

Hi Stefano,

Your design geometry isn't easy to understand by words. Can you please attach a screenshot?

Regards,

[TrippyLighting]

Can you share your design ?

[Anonymous]

link from object

[Anonymous]

this design clarifies better. So I would like the threads: inverse compared to what the program offers automatically. How can I do?

[etfrench]

This site gives the major and minor diameters for a thread close to the size you have selected (A more exhaustive search would find the exact sizes). Based on those sizes, this is how I would create the part:

 p.s. Join the new component to the out component when thread is completed.

p.s.p.s. See Rule #1

[etfrench · Accepted solution]

p.s.p.s.p.s. Fusion 360 doesn't add a chamfer to the beginning of a thread, so 3d printed threads may not work well.  This thread has links to several solutions.

[Anonymous]

The problem is not 3d printing and not even the bevel. I talked about printing to make sure that the problem was understood. If I physically hold the fusion designed object, the threads are against it and not as I have drawn in the section. If the threads are against it becomes impossible to insert the smaller cylinder into the hollow cylinder.

[Anonymous]

but are the proposed solutions artificial? Is there not the possibility to tell the program how the thread should be ... inside or outside the diameter?

[Anonymous]

I had used hole, but I was hoping for an automatic function when I select the thread ... to be able to tell if the thread is internal or external.

[TheCADWhisperer]

This thread was marked as solved by someone - but I don't think your question was really answered.

Do you understand the solution - or has the question not been answered even though the thread is marked as solved?

[Anonymous]

I think that the question would be solved if the program provided the direct tools to design a thread in a dynamic way in subtraction or addition. Agreed that the standrad situation is the screw and the nut, but let's take the simple case of a fountain pen with a thread inside the cap ... I always have to solve with some artifice. This thread could be considered solved, because by some answers or unsolved because it does not provide the direct tool. In fact, I asked if there was a direct way.

[TheCADWhisperer]

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@Anonymous wrote:

…. let's take the simple case of a fountain pen with a thread inside the cap .

In fact, I asked if there was a direct way.

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Autodesk Inventor Professional

[etfrench]

There is actually no difference between creating a nut bolt combination and a cylinder inside a cylinder.  If you had started by calling the outside cylinder a nut 10mm long, then added the threads, you would have the same threads as I created in the screen cast.  After that it would just be a matter of extruding a cylinder to the desired length and joining it to the nut.  The inner cylinder could just as easily been called a bolt.  Fusion 360 doesn't expose the major and minor diameters of the threads, but this can be found in the thread definition table.  (You'll have to search for the path )