# Embossing tools

Sheet-metal embossing tools, formed relief and marking variants, geometry limits, and tooling clearance during punch-press processing.

Reviewed: 2026-11-02

Tags: tooling, sheet-metal, forming, embossing

For a **12 mm diameter dimple** in **1 mm sheet**, CONIC's preferred height limits work out to **4.8 mm** by diameter and **3.0 mm** by thickness. A **2.5 mm** height is below both, while **3.5 mm** exceeds the thickness criterion. These limits apply to the cited dimple design. Layout must also allow the formed sheet and tool envelope to clear later hits. [CONIC emboss/dimple guide and tooling diagram](https://www.conic.co.jp/en/tech/forming_tools/vol2.html).

## Scope and terminology

Mate describes stretching sheet into raised or recessed stand-offs, mounting locations and sumps. [Mate Technical Solutions Guide, revision E, 2021, printed p. 42](https://www.mate.com/wp-content/uploads/2021/03/LIT00682_TechSolutionsGuide_RevE_LR.pdf#page=44).

PASS distinguishes a raised one-hit emboss from recessed line marking, engraving and point signing. [PASS product flyer, March 2025, version 1.3](https://www.pass-ag.com/downloadcenter-en.html?cid=3877&file=files%2Fpdf%2Fdownloadcenter%2Fenglisch%2FAvailable+for+all+systems%2FGI_FL_WW_embossing_marking.pdf).

## Tool action and direction

CONIC illustrates complementary upper and lower tool assemblies for both form-up and form-down dimples. It identifies positioning and decorative patterns as uses. Up and down describe the feature relative to the sheet and machine orientation; a recess viewed from one face is a protrusion viewed from the other. The required face, final height, and cross-section are therefore separate aspects of the feature. [CONIC emboss/dimple guide and tooling diagram](https://www.conic.co.jp/en/tech/forming_tools/vol2.html).

A full profile need not always be produced in one hit. Wilson Tool's Rolling Forge follows the form perimeter and gradually increases its height on successive circuits. That is a specific rolling-tool alternative to a dedicated single-hit emboss, not proof that any punch press can make any profile. [Wilson Tool, wheel-tool emboss application](https://wilsontool.com/en-gb/resources/wheel-tool-emboss-application-in-punch-press).

## Formed relief, cold forging, and line marks

Mate's cold-forged marking bulletin describes stopping before fracture creates a slug, forcing material upward into text or shapes. It describes rise up to 50% of sheet thickness, dependent on ductility. This is not a universal formed-emboss height limit. [Mate bulletin LIT01010, revision B, p. 1](https://www.mate.com/wp-content/uploads/2015/12/LIT01010_Emboss_V-Line_2021_LR.pdf#page=1).

| Process or tool | Result described by its manufacturer | Distinction |
| --- | --- | --- |
| Cold-forged emboss | Raised text or shape | Local material displacement without completing a shearing stroke |
| V-line stamp | Thin, indented line | Shallow line image rather than a broad raised plateau |
| TRUMPF engraving tool | Needle-generated path marking | Displaces material without chips |

The first two rows summarize Mate's bulletin; the third describes TRUMPF's named tool. In this context, “engraving” does not necessarily mean cutting away material. A machining or laser-engraving process cannot be substituted solely because it shares that name. [Mate LIT01010, pp. 1–2](https://www.mate.com/wp-content/uploads/2015/12/LIT01010_Emboss_V-Line_2021_LR.pdf), [TRUMPF engraving tool](https://www.trumpf.com/en_GB/products/services/services-machines-systems-and-lasers/tools/punching-tools/punching-tools/engraving-tool/).

## Geometry, material flow, and height

Mate describes surrounding-sheet draw-in, thinning, warping, and failure at direction changes. Shallower walls and larger radii reduce stress. A relief hole enlarges during forming, changing the feature. [Mate guide, printed pp. 42–43](https://www.mate.com/wp-content/uploads/2021/03/LIT00682_TechSolutionsGuide_RevE_LR.pdf#page=44).

CONIC's dimple guidance prefers height H below both 40% of diameter A and three times material thickness. For an original example with `A = 12 mm` and `t = 1 mm`, the two thresholds are `0.40 × 12 = 4.8 mm` and `3 × 1 = 3 mm`. A 2.5 mm height lies below both; a 3.5 mm height exceeds the thickness-based preference. These are geometry comparisons to that manufacturer's guidance, not validated forming limits. Ductility, radii, wall shape, and the actual tooling still matter. [CONIC](https://www.conic.co.jp/en/tech/forming_tools/vol2.html).

## Clearance, layout, and stroke control

Mate recommends at least 12.7 mm between multiple formed embosses for tool clearance and stress distribution. This is not a universal center pitch; finished-feature dimensions also do not describe the complete tool envelope. [Mate guide, printed p. 43](https://www.mate.com/wp-content/uploads/2021/03/LIT00682_TechSolutionsGuide_RevE_LR.pdf#page=45).

Mate's forming guidance describes why form-down features complicate subsequent sheet motion: they consume vertical clearance, can be flattened by later operations, and can catch in dies or pull the sheet from its holders. It therefore favors making unavoidable form-down operations last. The same guidance links depth consistency to controlled press stroke dynamics; press-frame recovery can drive the upper unit farther into the lower unit after a piercing load drops. [Mate forming techniques](https://www.mate.com/technical-resources/punch-press-resources/tips-techniques/forming/).

These physical constraints make neighboring forms, tool stations, workholder travel, and underside clearance relevant to a nested sheet. A two-dimensional arrangement that fits the blank is not, by itself, a complete motion or tooling-clearance analysis. This is an engineering implication of the clearance and forming-sequence guidance, not a published minimum spacing formula.

## Coverage and source dates

The cited guidance does not establish universal tonnage, punch-to-die gap, forming speed, permissible depth, or minimum edge distance. Those depend on the actual material, thickness, feature shape, tooling, machine, and operation. Piercing-clearance percentages describe a shearing operation and do not automatically specify the gap for a forming pair.

Mate's guide carries the actual footer “LIT00682 Rev E 2021.” The marking bulletin identifies LIT01010 revision B but supplies no confirmed issue year in the inspected text; 2021 in its URL is not treated as its edition date. PASS's flyer explicitly states March 2025, version 1.3. The cited CONIC, Wilson Tool, TRUMPF, and Mate web pages do not establish technical issue dates in the inspected content. This article's reviewed date is separate from the product or source revision.

For broader tooling context, see [Sheet-metal tooling](index.md).