You need to put a point into tool, weapon, and tech crafting in order to craft copper and iron tools, weapons, and tech respectively. Grapples are considered tech.
Awesome, thanks! I had put a point into tools and nothing, so I put another point into tools - still nothing. Skill points ain’t cheap so I probably never woulda figured this out.
Please also take into account that what you know how to craft is listed in “Knowledge” tab when you are in character menu - so where inventory and journal is.
In this Knowledge tab you can also check what kind of machine you need to use to create it.