Our history
A family workshop since 1932
Three generations, our strength. One motto: quality, precision & delivery on time.
Henri de Siebenthal founds the workshop in the middle of the economic depression. He buys a lathe, a drilling machine and Sécheron gas and electric welding equipment, mainly for repairs and the manufacture of spare parts. The workshop has never stopped growing since.
Henri de Siebenthal, the founder René de Siebenthal starts his apprenticeship with his father. Milling machines and a second lathe are bought. Then comes the war: mobilisation partially closes the workshop.
A lathe from the early workshop First extension: 68 m².
The founder dies. René de Siebenthal takes over the management, helped by his wife, and modernises the machines to increase production capacity.
René de Siebenthal Fifty years. The business becomes the partnership René de Siebenthal & Fils, as Jacques de Siebenthal, third generation, joins the management. A second extension of 70 m² separates turning from milling. Turning then has 7 lathes, for parts up to 2000 mm long; milling, 5 milling machines, for parts up to 1100 mm.
The workshop around 1980 The decisive step: a large-capacity Mori Seiki CNC lathe.
First Mori Seiki CNC vertical machining centre, 30-tool automatic changer. The machines are connected to the computer for programming and data transfer, with the Virtual Gibbs software.
To secure its future, the company becomes a family limited company, R. de Siebenthal & Fils SA, with a share capital of CHF 200,000. New machines follow, digital readouts on the older ones, surface and cylindrical grinding, and hardness, roughness and 0.001 mm measuring equipment with printed reports. The company obtains a certification to work in the field of space research.
In July, René de Siebenthal passes away, after devoting his life to mechanics and to his company. In November an extension begins: the production area more than doubles, to 436 m², to house a large-capacity CNC bed-type milling machine.
The new premises open. In February, Alex de Siebenthal is born: a fourth generation of mechanics?
A Mazak CNC lathe is installed: 1500 mm between centres, more than 400 mm swing over bed.
In April, a large-capacity HAAS machining centre goes into service: 1600 mm X travel, 800 mm Y travel.
Today
A park of 26 CNC and conventional machines, 436 m² of workshops, qualified polymechanics and the apprentices we train, and our own solar electricity: 62 kWp on our roofs.
After successfully obtaining his Federal Diploma (CFC) as a polymechanic in 2022, Alex has been taking courses in apprentice training, 3D programming, and management; he is gradually preparing to take over the company's leadership, representing the fourth generation.
Partial view of our workshops 
Partial view of our photovoltaic panels