[Tim Hancock]

36 grit is the fastest especially if you need to take off quite a bit on badly worn blades. When I sharpen mine, I am not worried about having a fine polished to perfection edge like I would with a knife blade. I try and maintain the original angle, but the only thing I really care about is that the blade ends up being balanced. I have sharpened my own mower blades for over 40 years and all I do is grind the blade until it looks sharp again then I slide it onto a smooth round phillips screwdriver shank to see if it balances. I then grind a tad more off the heavy edge and re-check. Sometimes I get it right away, sometimes it takes a couple tries. It ain't rocket science. The worse part of sharpening blades is the hassle of unbolting the blades from the mower. The quick grinding is the easy part.

For many years, I simply used a cheap Harbor Freight $14.99 4 inch corded angle grinder. I also now have and mainly use a Metabo corded grinder that a friend gifted me when he scored a couple used ones left over from a big construction job.

Were I to ever need a third, I would not hesitate to buy a cordless Bauer from Harbor Freight as I now have a couple battery operated occasional use Bauer tools.

My main drill and impact drivers are Dewalt 20v brushless, but for occasional use, I love the cheaper new Bauer stuff from Harbor Freight.