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Deutsches Technikmuseum - Processes and techniques

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The Websites of the donation Stiftung Deutsches Technikmuseum Berlin at a glance:

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Processes and techniques

Photos: On the left the embosser is pulling on the cable to raise the die. On the right a close-up of the museum brooch.

Embossing

Embossing

Complex jewellery parts can be embossed using a drop hammer. The embosser raises the relief die suspended on a cable, and lets it fall on the negative counterpart with a force equivalent to seven tonnes. Sheet metal is worked into its final shape in several stages.

Photos: On the left the finisher turning the large wheel of the hand-driven drawing bench. On the right a stretched blank in close-up.

Turning the wheel at the drawing bench

Rolling and Drawing

Rolling and drawing machines are used to make jewellery from wire, tubes or strips of metal, transforming them into bracelets, rings or creole hoops.
On a hand-operated drawing bench the finisher pulls the metal blanks through the different holes in the drawing plate to give them the required shape.

Photos: On the left a caster pours molten metal into a silicone mould. On the right the open halves of a mould showing the jewellery parts.

Spin casting

Spin casting

The caster pours the molten tin alloy into a silicone mould. Swift rotation of the mould in the spin caster forces the liquid tin through casting channels into the cavities. In this way, different pieces of jewellery are made together in one casting and can then be separated from each other.

Left and right: The chain mechanic setting up the chain-making machine using precision tools.

Chainmaking

Chainmaking

The chainmaking machine cuts wire into the required link length. The link is then shaped by a mandrel between the jaws of the tongs, inserted into the previous link and closed. The chain mechanic checks that the link fits perfectly.

Photos: On the left a goldsmith blowing through a pipe while soldering. On the right finished small parts.

Gold forging

Goldsmith´s workbench

Individual jewellery parts are assembled by hand at the goldsmith's workbench. The goldsmith saws, drills, files and solders. In brazing or hard soldering, a gas blowpipe is used at a temperature of nearly 450° Celsius to solder on material of the same type as the parts being joined. The goldsmith regulates the flame by blowing air into the pipe.

Photos: On the left a man working on an engine turning machine. On the right a gold-coloured metal disc with an engraved decorative pattern.

Engine tuning

Engine tuning

In engine tuning, also known as guilloché work, linear patterns are engraved into a metal surface.
The hand-operated rose engine machine follows the patterns on the rose and transfers the engine turner's design to the metal plate. Step by step a geometrical pattern of zigzag and wavy lines takes shape.