Our expertise — Precision straightening

Straightening, a discipline in its own right

Precision straightening is a discipline in its own right, situated at the interface of mechanics, metallurgy and dimensional control. It is not a simple corrective operation, but a trade of understanding, analysis and mastery.

Each part has its own behaviour, linked to its geometry, material, metallurgical state and manufacturing history. Our role is to understand this behaviour in order to define a realistic, controlled correction action compatible with the part's final function.

Understand before acting

A part never deforms by chance. Straightness, flatness or geometry defects can result from:

heat treatment,
machining,
welding,
handling,
or non-homogeneous internal stresses.

Before any intervention, we seek to understand:

the origin of the defect,
how the part reacts under stress,
the limits not to be crossed to avoid any deterioration.

« Precision straightening always begins with analysis, never with a brutal action. »

A progressive and controlled approach

The straightening we practise is based on progressive, controlled corrections adapted to each case. There is no universal solution applicable to all parts.

Depending on the problem encountered, the intervention may target:

straightness,
flatness,
circularity,
de-ovalization,
or a combined correction of several defects.

In some cases, targeted tolerances can reach a few hundredths, requiring particular rigour at each step.

Respect for the part above all

A geometric correction only has value if the part retains its functional characteristics. We pay particular attention to:

surface preservation,
absence of marking,
respect of coatings,
and material integrity.

This requirement is essential for sensitive, treated, coated or high-value-added parts, particularly in the aeronautics, defence and nuclear sectors.

Control, an integral part of the trade

Control is not a final independent step. It is an integral part of precision straightening.

Control methods are chosen according to:

the type of part,
its geometry,
and the required function.

Straightening and control are conceived together, to ensure coherence between the correction performed and the geometry actually measured.

Know-how and limits

Not all parts can be straightened without risk. Knowing how to identify limits is an integral part of the trade.

When material, geometric or functional constraints do not allow a controlled correction, we say so clearly.

« Knowing how to say no is sometimes the only responsible technical decision. »

A trade of decision

Precision straightening is a trade where each intervention engages technical responsibility. It is not about applying a method, but about making a reasoned decision, based on experience, analysis and understanding of constraints.

It is this approach, transmitted and enriched over several generations, that forms the heart of the trade at ETS Chevreuil today.