Profimach Centre Hole Grinding Machine are designed and perfected to produce just this, truly circular, geometrically accurate and precisely aligned center holes or center cones in components either in /soft or hardened condition.

Profimach PGCH-180CNC-Series of Center-hole and center-cone grinders not only make poor centers again precise but can move them as required to the optimum position

 – for example, onto the axis of a gear halfway along a shaft bent during hardening.

Some of the benefits;

• When a subsequent external grinder – cylindrical, gear, spline, thread and its dead centers are in good condition, runout less than 0.001 mm can be obtained on work whose centers have been center ground with our Profimach grinder
• Subsequent grinding times are DRAMATICALLY reduced.
• Even case-depth can be assured on important surfaces.
• Subsequent roundness and concentricity checks have known bases.
• When center condition is unknown, inspection charts and diagrams are purely speculative.
• Full and correct contact between work and dead centers prolongs the principle of planetary grinding life of expensive carbide centers.
• Good center holes reduce drastically the vibrations in next operations

The grinding cone dressed accurately to a 60 ° included angle is given three motions simultaneously to produce the desired result.

 A Rotary motion of the grinding cone about its own axis, a rotary contra-sense rotation of the workpiece, coupled with a linear motion 30° angular with the spindle axis while the workpiece is held stationery on a bottom dead center and a 3-point self-centering V-vice.

Due to the three simultaneous grinding motions, the profimach fabricates a homogeneous cross-grinding pattern with microscopic oil pockets that form a constant oil film between the workpiece and dead center of the cylindrical grinding machine. This prevents dry running and seizing of the dead center and eliminates an additional source of error for high quality cylindrical grinding