FXED-TURNING® is a machining principle that excludes the very possibility to generate chatter marks (same principle as a lathe).

The tool travels along the profile and only machines a very small quantity of material, without cutting effort. The seats always are perfectly round and the surface finish is perfect regardless of the length of the profile, including when the seat insert is off-centered hence leading to an alternated cut.

Angles are obtained with utmost precision, the incidence of tip holders on the precision of the angles no longer exists. Any requested value is automatically achieved by the programs and the numerical control .Each angle can be programmed on hundredth of a degree at a time thus allowing to define with precision the valve resting area and to obtain perfect seals. The surface finishes obtained are perfect regardless of the hardness of the valve seat material.

The FIXED-TURNING® allows to machine very small depths with a high degree of precision and without defect. It is possible to program cuts as small as one half thousands of an inch and to carry them out successively to touch up a valve seat with minimum deformation.
Modern engine cylinder heads require repairs where a minimum of material must be removed to guarantee the possibility to make adequate adjustments. The FIXED-TURNING® is the only valve seat machining means to guarantee this possibility.

Valve seal is essential to the correct functioning of the engine. Only a perfectly round valve seat and vale round will allow a contact metal against metal on the entire surface of the seat and shall guarantee a perfect seal.

When controlling visually through an intake or exhaust port, we will not see any light signifying a leak. Only two identically round surfaces can guarantee the seal.

The FIXED-TURNING® guaranties circularities strictly below 3 microns (<3µ ≡>) Perfect Seal.