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How the internal procedures protect you at work
In a severe collision, not only the visible panels are shifted — the actual load-bearing structure of the body can be pushed out of shape. Such damage is rarely seen with the naked eye but determines whether the car drives straight, whether the wheel alignment can be adjusted and whether the safety zones are still where they should be. Measurement and straightening on the frame bench is about recreating the body's geometry to the manufacturer's specifications.
The manufacturer has determined exact measurements for where attachment points, suspension, and bearing parts must sit. If the structure is shifted even a few millimeters out of position, the wheel alignment cannot be adjusted correctly, the car can pull crooked or tire wear unevenly, and the deformation zones may not fold as intended in a new collision. Geometry is therefore not cosmetics—it's both handling and safety.
On a straight bench, the car is secured at the prescribed points so that controlled pulling can be done in the structure. A measurement system — mechanical, electronic, or optical — compares the car's actual points with the manufacturer's target data. The deviations show where the structure is displaced and in which direction pulling should be done. You measure before you straighten, during and at the end — without measuring, you straighten blindly.
Not everything can be straightened. Certain high-strength steels lose their properties if they are heated or deformed, and the manufacturer therefore prescribes replacement of certain load-bearing parts rather than straightening. Always consult the repair instructions before deciding whether a deformed part should be straightened or cut out and replaced — straightening a part that should have been replaced can weaken the structure.
When the geometry is recreated, two things show whether the work succeeded: that the wheel alignment (toe, camber, caster) can be set within the manufacturer's values, and that doors, hood, fenders, and lights fit with uniform gaps. When geometry fits, the rest often sorts itself. If it doesn't, there's still a hidden offset that needs finding.
Save the measurement log before and after adjustment. It documents to the customer and insurance that the vehicle has been brought back within the manufacturer's tolerances, and it is a professional quality assurance. A repair you can document is properly measured is a repair you can stand behind.