Need Help Drawing

I see no image in your post.

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D - 282 mm
d -15.5 mm

I’m trying to figure it out myself, it doesn’t work out.

This looks like a spiral or helix around a sphere.

See here:

https://sketchucation.com/forums/viewtopic.php?f=323&t=30724

I used the plugin in the following SU file. Click in sequence on the scenes tabs.

Spiral on a sphere.skp (1.4 MB)

Notice that I used meters instead of millimetres to avoid face creation problems with tiny edges. You can scale it down if you want.

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And how to increase the volume of the rod?

Use a larger diameter for it. You specified d = 17.5 mm and this is what I used to draw the small circle. Use whatever you want.

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suggest resources and books to study.

Search the internet with terms such as “Spherical helix” or “Spherical spiral” or “Loxodrome”

Did you look at the post I pointed in my post containing the SU file. If you are not a member of SketchUcation, you can subscribe, it is free.

I meant for learning sketchup

https://help.sketchup.com/en

@Anssi told you this 23 hours ago…

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