🔍 Key Concepts

• Construction and design of different shaft couplings (flexible disk, grid, gear, and block & jaw) • How damage is distributed in each type of coupling (sacrificial elements vs. machined bodies) • Typical maintenance practice: which parts are meant to be replaced vs. repaired/machined

💭 Think About

• For each coupling type, ask yourself: Is it built from many small, replaceable elements or from a few precision‑machined pieces? • Which coupling is most likely to be considered a disposable unit if badly damaged, rather than something you would machine, re-bush, or re-sleeve? • Think about alignment and balance: which coupling type becomes unsafe or impractical to restore to proper tolerance once it is badly damaged?

✅ Before You Answer

• Identify which coupling relies on precision gear‑like or interlocking metal parts that must be perfectly aligned • Decide which coupling has easily replaceable flexible elements (springs, grids, blocks, or disks) versus replacing the entire coupling • Consider which design, when "completely damaged," would most likely be changed out as an assembly instead of attempting repair