You don't even need hatching (though you can) to convey volume.
Careful use of "C" "S" and "I" lines is enough.
These type of lines carry all the essential flow you need.
The "C" and "S" can be used to do organic or fabric forms, and also movement, while "I" is usually best when doing man-made objects, bones, or to convey stability.

The main thing to keep note of is that when those lines interlock, they need to form a "T" (the "T" can be curved as well), because that is what separate one line from another.

This is why is generally good to avoid tangents, because when there is one, your lines intercede and start to become confusing.

Pic related shows how Kim Jung Gi (RIP) did that a lot.
In this drawing he didn't even use hatching such as Terada or Moebius, however, he did choose his lines carefully (he talked about this a lot in his interviews), in a way that they are simple yet because of the flow and interlocking, it all comes together in a drawing that has both accuracy and sense of form.

There is a exercise to practice this, which is drawing a contour, then drawing something inside of it. I'm gonna post a pic in the next post to further examplify my point.