Broaching tool design: A typical broach contains which types of teeth along its length?

Introduction / Context:Broaching is a high-productivity process in which a multi-tooth tool removes material in a single pass. The geometry and sequence of teeth on a broach are engineered to distribute cutting load and achieve final size and finish reliably.

Given Data / Assumptions:

• Internal or surface broach with progressive rise-per-tooth (RPT).
• Work material and fixturing suitably chosen.
• Single-pass broaching operation.

Concept / Approach:A broach is segmented into zones: roughing teeth remove most stock with larger RPT; semi-finishing teeth refine the geometry with smaller RPT; finishing teeth establish the final dimension and surface finish with minimal RPT. This progression manages forces and achieves accuracy without separate tools.

Step-by-Step Solution:

Verification / Alternative check:Tool drawings list tooth height progression and sections labeled R, S, and F, confirming the staged design.

Why Other Options Are Wrong:

• Only roughing or only finishing would either overload the tool or fail to achieve finish and accuracy.
• Only semi-finishing omits necessary bulk removal and final sizing.

Common Pitfalls:Neglecting proper chip space (gullet) and coolant supply in roughing zone causes chip jamming; ensuring correct RPT distribution avoids chatter and tool wear concentration.

Final Answer:All of these (roughing, semi-finishing, and finishing teeth)