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Let me explain how these massive excavators operate, focusing on the two main types:

Bucket-wheel excavators operate through a fascinating continuous process:
- The giant wheel rotates constantly, with each bucket scooping material as it turns
- As each bucket reaches the top of its rotation, it dumps material onto a conveyor belt
- The entire machine moves forward on a combination of crawler tracks and rails
- The main boom can swing side to side and up/down to excavate in layers
- They typically require just 3-4 operators despite their enormous size
- The machine operates 24/7, only stopping for maintenance
- Operators use advanced computer systems to control cutting depth and positioning

Power shovels operate differently:
- They use a single massive bucket attached to a boom
- The operator controls three main movements: hoisting (raising/lowering), crowding (extending/retracting), and swinging
- Each cycle involves digging into the material, lifting, swinging to dump position, and returning
- The bucket is filled using both the forward thrust of the crowd motion and the upward pull of the hoist
- They're more flexible than bucket-wheels but can't achieve the same continuous operation

The really interesting aspect is how they handle maintenance:
- Most have built-in workshops within their structure
- Teams can replace individual bucket teeth while the machine continues operating
- They use sophisticated monitoring systems to predict potential failures
- Major components are designed to be replaced in modules to minimize downtime

What's particularly fascinating is their precision despite their size - operators can control these enormous machines with accuracy down to a few centimeters, which is crucial for efficient mining operations.

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