I sharpen many chains at a time (18"), I just clamp a bar in the vice with a chain on it,and use a bungee cord to pull the slack tight, hook end to a screw in the bench leg. All my chains are at a very different stage of wear, so adjusting the grinder over and over took way longer than just using a file. I'm running the chain on a processor and it's not practical to sharpen on the machine. I get chains from the dumpster at work that the fire fighters have deemed junk, not worth their trouble to fix up so some take a lot of filing to get back, but 10-15min per chain don't seem bad to me.