Types of broaching motions Which broaching operation is characterized by either the work or the tool moving across the other to generate external planar or contoured surfaces (rather than purely internal holes or keyways)?

Introduction / Context:
Broaching uses a toothed tool with progressively increasing tooth height to remove material in a single pass. Different broaching modes address internal forms, external flats, and production flow requirements.

Given Data / Assumptions:

• Comparison among pull/push, surface, and continuous broaching.
• Looking specifically for “moving across the other” to generate external surfaces.

Concept / Approach:
Internal broaching (pull or push) draws or pushes the broach through a preformed hole to create splines, keyways, or polygonal shapes. Surface broaching moves the broach across an external surface (or moves the work under a stationary broach) to machine flats, slots, or contours. Continuous broaching refers to a production method where multiple parts travel past multiple broaches on a conveyor-like machine.

Step-by-Step Solution:
Identify the motion: cross-wise relative motion between tool and work.Match to process: this is surface broaching.Therefore, select surface broaching as the correct operation.

Verification / Alternative check:
Process descriptions and schematics show surface broaches mounted on slides while the work reciprocates or feeds continuously beneath them.

Why Other Options Are Wrong:

• Pull/push broaching: internal, along the hole axis.
• Continuous broaching: a production arrangement, not a motion definition; may be internal or surface depending on tooling.
• Rotary broaching is a separate process done in lathes to form polygons in holes.

Common Pitfalls:
Equating continuous broaching with surface broaching; overlooking fixturing needed to support long broaches in pull operations.

Final Answer:
Surface broaching