DamaSightForming & machining allowance
Plan for the final surface, including what later operations will remove or deform.
Start with the face you want to reveal.
Decide the display face, final outline, and changing thickness before choosing when patterning occurs. Later drawing out increases twist spacing; bevel grinding intersects different layer depths. Cropping a billet photograph into an outline does not reproduce the material movement of forming.
| Allowance | What it must accommodate |
|---|---|
| Exterior cleanup | Scale, uneven surfaces, and affected surface material. Use matching samples to investigate cleanup depth and hardness. [14] |
| Pattern development | Material needed to expose a pressed structure or to deform a cut-groove route. Verify thickness and removal together. [20] |
| Pre-hardening section | The heating, cooling, and subsequent grinding behavior of thin or asymmetric regions. Use a verified geometry rather than a universal millimeter value. |
| Composite core exposure | Core and cladding position after final grinding. Check retained sections, dimensions, and intermediate test etches. [29] |
Put the operations in a workable order.
Complete required machining and major pre-grinding in an appropriate condition. Address stress-concentrating geometry and defects before final hardening. Follow the selected route through tempering, controlled finish grinding, assembly, and final finishing; later heat can affect an earlier treatment or assembly material. [3]
Confirm material suitability and joining before optimizing final appearance. Grinding a crack out of sight is not evidence that the billet is sound.
The Pattern Notebook · 12 of 18Visual learning. Real-world results vary.