🔍 Key Concepts

• Understand common machine drawing symbols such as R, chamfer angles, and surface finishes • Notice exactly where the 1/8"R is placed on the part in the illustration • Distinguish between a radius/fillet, a chamfer (often marked with an angle like 45°), and a recess

💭 Think About

• Look for how other features are labeled in the drawing: how is the 45° feature called out, and how are straight distances shown? • Ask yourself: when a number is followed by an angle symbol (°), what kind of feature is that, and when it is followed by an "R", what kind of feature is that? • Check whether the callout 1/8"R is applied at an outside corner, an inside groove, or across a flat surface

✅ Before You Answer

• Verify that chamfers are usually dimensioned with an angle (like 45°) and a length, not just an R • Confirm that surface finish or roughness is normally shown with special surface finish symbols, not just the letter R • Check the drawing to see if the 1/8"R note is pointing to a rounded corner/edge on only one end of the tool, and not to both ends or to an internal recess