🔍 Key Concepts

• Thermal expansion of metals during precision machining • Required tolerances and surface finish on large reduction gear teeth • Effects of ambient temperature changes on large workpieces and machine tools

💭 Think About

• When cutting very large gears, what happens to both the cutting machine and the gear blank as the room temperature rises or falls during the day? • Which choice directly addresses maintaining precise gear tooth spacing and profile across a large diameter gear? • Which options are about general mechanical issues, and which one is specifically about precision machining conditions?

✅ Before You Answer

• Consider how even small temperature changes can cause measurable dimensional changes in large steel parts. • Ask which factor would most affect the accuracy of tooth geometry and clearances, not just general strength or vibration. • Eliminate options that do not clearly relate to precision machining tolerances or temperature effects.