We recently purchased this Multitool belt grinding attachment from Trick-Tools. This is a cool grinder attachment even without being driven.
Want to make a homemade knife? You'll need to get a forge. Lucky for you, they are super simple to make—just get a soup can, some plaster, and a propane torch, and you're on your way to DIY blacksmithing at home!
I have been wanting a 2 x 72 belt grinder ever since I started making knives on my wimpy 4 x 36 belt sander. After looking around at some designs I figured I could.
No Weld Grinder Detailed Plans to Build Knife Grinder - pdf