🔍 Key Concepts
• Locational interference fit – a fit with a small interference, just enough to accurately locate parts without heavy force
• Difference between shaft diameter and hole diameter in figures A, B, and C (.245, .250, .255 vs .250 hole)
• How changing shaft size or hole size affects whether you get clearance, line‑to‑line, or interference
💭 Think About
• For each figure (A, B, C), calculate: shaft diameter minus hole diameter. Which one is currently clearance, which one is line‑to‑line, and which one is strong interference?
• A locational interference fit is usually a light interference fit. Which option moves the existing dimensions toward a slight interference rather than a big interference or a clearance?
• Look at each answer: does it increase or decrease the difference between shaft and hole? Does that move you toward or away from a small interference?
✅ Before You Answer
• Be clear on which figure already has the shaft larger than the hole and by how much
• Check which option would result in the shaft being only a few thousandths larger than the hole, not eleven thousandths
• Eliminate any answer that would obviously create a clearance fit (hole larger than shaft) or relies on unrealistic methods (like excessive force)