Rope making can use a simple machine to twist individual yarns into a rope.

Options for making a rugged machine: 

CNC aluminum or steel

Pros:

   Strong

Cons:

   Complicated assembly to accommodate standard bearings.  Have to create separate piece for hook (and bolt/nut) so that bearing can be installed.

    Need access to CNC

Bent steel

Pros:

  Strong

  Single piece of metal, no connectors required.

  Install bearings on rods and then bend to shape.

Cons:

  Need tool for bending steel rod

3D printed plastic

Pros:

   Tools available to fabricate

Cons:

   Poor strength, especially when operated by children.

   As with the CNC option, one must print in multiple pieces for hook (and bolt/nut) so that bearing can be installed.