Threading operations typically use a V-shaped form tool with what cutting edge angle?

Threading operations typically use a V-shaped form tool with what cutting edge angle?

• A. 60 degrees
• B. 45 degrees
• C. 30 degrees
• D. 90 degrees

Answer: (A)

Threading relies on forming the exact profile of the thread as you cut. Standard threads have a 60-degree angle between the flanks, so the V-shaped form tool used for cutting is ground with a 60-degree included angle to match that profile. This alignment ensures the tool engages the workpiece correctly, producing the proper thread shape and depth while minimizing rubbing on the flanks. Using other angles wouldn’t match the standard thread geometry: a 30-degree tool would create an overly sharp flank, a 45-degree tool would not match the standard profile, and a 90-degree tool would produce a square-cut appearance rather than a true thread.

Threading relies on forming the exact profile of the thread as you cut. Standard threads have a 60-degree angle between the flanks, so the V-shaped form tool used for cutting is ground with a 60-degree included angle to match that profile. This alignment ensures the tool engages the workpiece correctly, producing the proper thread shape and depth while minimizing rubbing on the flanks. Using other angles wouldn’t match the standard thread geometry: a 30-degree tool would create an overly sharp flank, a 45-degree tool would not match the standard profile, and a 90-degree tool would produce a square-cut appearance rather than a true thread.