One thing you might consider with your $5,000 budget. You’re going to need a LOT more stuff than just a grinder for making knives. Good abrasive belts are super expensive. So is good steel, like CPM stuff. You’ll likely need to make sheaths for your knives, so you’ll need either a kydex press or the tools to make leather sheaths. Will you be heat treating your knives in house or sending them out? If you will be doing them in house, you’re going to need a heat treating kiln/oven. You can get by with a forge if you’re just using 1084 high carbon steel, or similar simple steels. Either way you’ll probably want to get a forge to forge knives. Those are expensive. If you plan to build folders or hidden tang knives at all, a milling machine is VERY handy. So is a surface grinder. Do you have a drill press or bandsaw? You’ll need both of those. You’ll also likely need a bufffer too. The list goes on and on. What I’m getting at is, the grinder is just one part of the operation.