In hand tool operations for slotting and key seat preparation, which specific chisel form is preferred for cutting keyways with parallel sides and a flat bottom in shafts or hubs?

Introduction / Context:

Keyways are prismatic slots machined in shafts or hubs to accommodate keys for torque transmission. While machine tools are commonly used, hand fitting and corrections often rely on chisels with geometries tailored to the slot profile.

Given Data / Assumptions:

• Goal: produce/clean a narrow rectangular slot with parallel sides and a flat bottom.
• Work may involve deburring, minor enlargement, or finishing after drilling/slotting.
• Chisel operation performed along layout lines.

Concept / Approach:

The cape chisel has a narrow cutting edge and side clearance that enable it to cut grooves and keyways to width while maintaining sidewall parallelism. A flat chisel is wider and suited to general chipping; a round nose creates semicircular grooves; a diamond point is for corners and V-grooves. Thus, the cape chisel matches the keyway geometry.

Step-by-Step Solution:

Verification / Alternative check:

Fitting manuals show cape chisel shapes specifically for key seat work, confirming tool–task alignment.

Why Other Options Are Wrong:

• Flat chisel: lacks side relief; risks widening beyond layout.
• Round nose: forms curved bottoms, not flat key seats.
• Diamond pointed: intended for corners/V-grooves and cleaning internal angles.
• Side cutting chisel: specialized for lateral cuts; not the standard keyway tool.

Common Pitfalls:

• Failing to maintain chisel sharpness and correct rake/clearance angles, resulting in sidewall taper.
• Neglecting to support the work securely, causing chatter and misalignment.

Final Answer:

cape chisel