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I was looking into a stress reliever to have at work and I decided to make some surface plates by lapping. I was going to go for a 3 plate method by using iron, or mild steel, plates


What compound should I start with for lapping cast iron? Would valve lapping compound be the right place to start, or would I need a more abrasive compound? I'm hoping to have a rough starting figure on grit. I see everything from 80-1200. Is there a cheap but works compound?

Check McMaster carr for lapping compounds. The clover stuff is reasonably priced. The choices they offer gives you an idea of the surface finish you might be looking for.