Stamping Depth
Definition
The depth to which the original punch deformed the metal grain. Typically two to three times the visible indentation depth. Restoration works only if metal remains within this deformation zone.
- Ratio to visible depth
- Typically 2 to 3 times the visible indentation
- Governs
- Whether erased-mark restoration is possible at all
- Cause
- Plastic deformation of metal grain under the punch
Common questions
How does an examiner know if enough stamping depth remains to attempt restoration?+
There is no way to measure it non-destructively before etching. The examiner estimates remaining thickness from the amount of material removed versus the typical original mark depth for that part, then proceeds with an etchant test on a small area first.
Does stamping depth vary between different types of stamped marks?+
Yes. It depends on die hardness, applied force, and the hardness of the metal being stamped, so a chassis number struck with a heavy hydraulic press typically deforms deeper than a lightly hand-stamped part number.
Related terms
- Electrolytic Etching
- Electrochemical alternative to chemical etchants. The part is the anode in an electrolyte bath; controlled current selectively dissolves the strained metal at...
- Fry's Reagent
- Classical etchant for plain carbon and low-alloy steel: 40 g cupric chloride (CuCl2) + 90 mL concentrated HCl + 100 mL water....
- IMEI (International Mobile Equipment Identity)
- A unique 15-digit number permanently assigned to a mobile device's hardware. Used by networks to identify and block stolen devices, and by...
- Magnetic Particle Inspection (MPI)
- A non-destructive testing method that reveals magnetic-domain contrast between cold-worked and unstressed zones in ferromagnetic metals using a ferrofluid under UV illumination;...
- Obliteration
- Covering of existing writing with an opaque layer (ink, correction fluid, or correction tape) so that the underlying text is invisible in...