I use different methods depending on the size and shape of the knife. A belt sander is great, but takes practice. You need to get some cheap steel and practice first. A lansky is a good safe bet. I've got a couple of sets that I've used for years. It's slow but you can put a really nice edge with a pretty accurate angle. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />