The shop-floor problem
Document the part, drawing and practical effect: development, angle, radius or fit.
Where calculations meet real parts.
Technical Notes collect production problems, bending conditions and verification. Not a list of abstract formulas: real cases that explain what influences the result, what the available evidence supports and what still needs measuring.
The method
Geometry first. Then the model.
Start with the inside radius the sheet actually forms. From there, derive a consistent K-factor and verify development, keeping observed data separate from estimates.
Bending conditions
Material, thickness, punch, die, angles and process place the case in context.
Measurements before claims
Direct measurements, CAD/CAM data and estimates stay distinct. Missing data remain unverified.
Technical Notes
From the calculation method to real shop-floor cases.
Two complementary reads: first the method used to interpret a bend, then a documented production issue.
NOTE · 00 / THE METHOD
Read Note 00 ↗Why do we start with the formed inside radius?
The formed radius connects tooling, material and bend geometry. Understanding this step helps derive a consistent K-factor and a more reliable flat pattern.
REAL CASE · 01 / THE FIT
Open Case 01 ↗When the formed radius affects fit
A documented production case: the drawing radius is known, but the actual formed radius still needs to be measured.
An evolving archive
We don't hide what is missing.
A case is useful when it can be reproduced and its limits are explicit. New notes will follow the same rule: stated conditions, traceable source types and verifiable measurements.
Theory proposes a model. Real parts reveal how well it describes production.