What happens when built-up edges occur on reamers?

What happens when built-up edges occur on reamers?

• A. Improved cutting efficiency
• B. Increased risk of breakage
• C. Oversized holes
• D. Enhanced surface finish

Answer: (C)

When built-up edges occur on reamers, it typically leads to the creation of oversized holes. Built-up edges are formed when material accumulates on the cutting surfaces of the reamer, affecting its ability to cut precisely. This accumulation can alter the geometry of the cutting edge, resulting in less effective cutting action and, ultimately, an increase in the size of the hole being reamed. While other effects, such as a potential decrease in efficiency or finish quality, may arise from built-up edges, the primary consequence is the undesired widening of the hole beyond the intended diameter. This happens because the reamer no longer maintains its designed cutting dimensions. Thus, understanding the formation of built-up edges is crucial for anticipating the impact on hole size and addressing issues in machining processes effectively.

When built-up edges occur on reamers, it typically leads to the creation of oversized holes. Built-up edges are formed when material accumulates on the cutting surfaces of the reamer, affecting its ability to cut precisely. This accumulation can alter the geometry of the cutting edge, resulting in less effective cutting action and, ultimately, an increase in the size of the hole being reamed.

While other effects, such as a potential decrease in efficiency or finish quality, may arise from built-up edges, the primary consequence is the undesired widening of the hole beyond the intended diameter. This happens because the reamer no longer maintains its designed cutting dimensions. Thus, understanding the formation of built-up edges is crucial for anticipating the impact on hole size and addressing issues in machining processes effectively.