There are plenty of melee weapons in the model packs available.
This is not a request board for 3D models, this is a showcase and Q&A for 3D modellers to showcase their work and ask others about their workflow, software etc.
I would advise you to take a look at the available model packs or maybe try doing a search for some free models.
Welcome to the forums.
As you are new here, i will help you. If you click on the store logo at the bottom of the main screen in FPSC, then, type 'free' in the search box shown, you will find a Machete.
Unfamillia