And it's not often that robots themselves break down. I've seen ABB robots that have been running for 20+ years in production, 24/7. They don't physically get stressed in my working world, since all they are doing is moving parts around. They are usually a lot bigger than their loads due to the need for reach. The biggest material handling robot I've seen can lift 1,000 Kilos and that's the largest robot that ABB makes, one of their Foundry 2 series. And the load it's picking up is almost at capacity. Since it isn't moving fast and won't be moving thousands of parts a day, it likely won't get worn out quickly, but it won't last more than 10 years before needing all of the bearings and servo motors replaced to get rid of backlash. Most of what breaks on a robot is the end of arm tooling, which we can't do much about, material stresses and cracks over time under load. Even with regulated pressure, often times the gripper pieces are what breaks.