For year, I resisted the urge to buy an angle grinder. It just seemed like such a crude tool. But then I looked at the mushrooming of my wedges, basically shrapnel in waiting, and decided to take the plunge. Just like with my buffer, I feel foolish for having waited so long. I keep finding great uses for this tool.
A while back, I saw these "Flap" wheels for the angle grinder at the store and thought that they might come in handy. When I was teaching at Kelly's last week, Roger Clark told me that he'd had great luck using these to sharpen his mower blades. Roger brought one in, but the mower had taken it's toll and it didn't work on the hardened steel we were working with. Always willing to take a $5 bet, I picked up a new one yesterday, and the results are fantastic.
I've been using regular grinding and cutting wheels on the angle grinder to knock down high spots on the back of drawknives while flattening, and it's proven to be faster and more controllable than I had expected. But the smooth action of the flap wheels and ease of control is far superior.
I haven't met the craftsman yet who lives for flattening the back of tools, but honestly, I'm having to control myself from wanting to grab all my knives of the rack and make them this lovely. Well done Roger!