Hey!(thanks Si) If something goes wrong, it's gonna be operator error most of the time. The machine will do what you set it to do. Sometimes it will be to the point of breakage. If I can find nothing wrong with my setup, then I'll check for flaws in the machine or components.
Like my buddy Roy says,"human beings are just plain dumb." "We're all human and we're all gonna' do stupid things". One day someone will ask about casting bullets in your boxers and undershirt.