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Frame/Unibody Repair

European car manufacturers Audi, BMW, Jaguar, Mercedes and Porsche require the use of a special frame straightening machine to correct structural damage. We use a Celette system like those found in their automotive training centers and factories. Manufacturers feel the Celette is the only system capable of producing the tight tolerances required for safe and accurate repairs.

Types of construction

The two types of automobile construction are body on frame and unibody. Body on frame is mostly used for trucks and SUVs. Unibody is the construction used for most automobiles and smaller crossover SUVs. Some vehicles like Jeep Cherokees are a combination of these two designs. Regardless of the design, the frame of a vehicle has multiple functions. First it defines the dimension of the vehicle. The frame is what all other parts align with. Secondly, the frame is designed to provide safety in the event of a collision. It is built to bend and crumple in certain places in order to absorb the energy of a collision while at the same time protecting the passenger compartment.

What is frame repair?

In about half of collisions there is some degree of frame damage. It could just be the bumper mounting member that's bent of the damage could be extensive enough to require the replacement of a part or all of a frame rail. Frame repair not only involves restoring frame components to their original dimensions, but also to their original strength. Where metal is bent it becomes hardened in the bend where the molecules are pushed together. Through a process called stress relief, the molecules are arranged back to their original configuration and the steel is restored to its original strength.

How is it done?

This type of repair is done on a frame machine which is a platform onto which the vehicle can be clamped. It also uses hydraulic rams which will pull with a force of up to 20,000 lbs. Along with the devices for pulling, a measuring system is utilized. A common system uses a laser and reflective targets which are accurate to within one millimeter. This system can be used live and the dimensions of the vehicle can be monitored during the pull. The vehicle is measured in three dimensions; height, width and length. Once the frame has been restored to its original condition, all other parts will fit and the wheels will align correctly.