Unfamiliar with a metal shaper? I’m not surprised, you don’t see them being used often, milling machines being much more common. But there was a time where they were a staple of the fabrication shop. Search youtube to find a few videos that will give you an overview. If you find a old one on craigslist or ebay for cheap, there is a lot you can do with them - assuming you have the floor space for them in your shop.