Machining Burrs: Edge Location, Removal and Acceptance

A machining burr is unwanted material remaining at an edge after material removal. Burr removal and the design of an intended chamfer or rounded edge are related but separate questions. The acceptable condition depends on the part’s function and the specified edge requirement. A general instruction to “deburr” should not be interpreted as permission to change every edge without a limit. KEMPF deburring introduction

Burr, deburring and specified edge geometry

A burr describes unwanted material at an edge. Deburring describes its removal. A specified chamfer or rounded edge describes the intended geometry of the finished part. Removing a burr and producing that geometry may be combined in an operation, but the required results remain separate.

For example, “remove burrs” does not define the size of a designed chamfer. A dimensioned edge feature does not by itself establish whether another hole intersection is free of unwanted material. Identify the feature and its requirement together. Deburring context

Identify where the edge is

Gühring distinguishes hole entrances, exits and cross-hole intersections in its deburring-tool explanations. That distinction supports recording the actual location; it does not establish that one tool can finish every possible intersection. Original toolmaker discussion

Describe the required result

As an editorial specification aid, identify the edge, the permitted added or removed material where the drawing defines it, and the inspection evidence required. Keep a designed chamfer dimension separate from a requirement to remove an unwanted burr. Where the design is incomplete, record an open question rather than inventing an acceptance threshold.

For a hypothetical fluid passage intersecting a bore, an external visual check alone does not answer the question about the internal intersection. The review should identify that location and agree how evidence of its condition will be obtained. This example does not prescribe a removal or inspection method.

Removal does not establish the cause

KEMPF discusses reducing burr formation before subsequent deburring. Gühring describes different approaches to removing burrs at specific hole features. These are application explanations, not a root-cause diagnosis for a supplied part. The observed edge, material, route and tooling history would be needed before proposing a corrective process. Burr-reduction context · Feature-specific removal context

Limits and connected reading

Acceptable edge conditions depend on the specified feature and function. This article does not prescribe a universal acceptable burr height. Communicate the approved edge requirements using the CNC RFQ checklist, and distinguish corner geometry using the internal-radius explanation.