Northern Tool has a hand grinder with a big v-belt pulley you can use as a hand grinder with the attached handle or add a motor with a belt. I think the problem with hand grinders is not what they can grind, but what you can fit in them. I don't know if that one could handle big parts without busting and cutting them down first. The small hand grinder I use for fish, fish bones are small, has a little trouble sucking down whole bluegills, but they would be easy to chop smaller. Once I get them into it they grind easy.