Junker Grindor 2

The Junker Grindor 2 is a CNC cylindrical grinding machine designed for high-productivity external cylindrical grinding of shafts, pins, and rotationally symmetric components. Built by Erwin Junker Maschinenfabrik GmbH (Junker Group), the Grindor 2 is positioned as a production-oriented platform for the automotive, bearing, and industrial component manufacturing sectors, where cycle time, process reliability, and consistent dimensional output across high-volume runs are the primary machine selection criteria.

Junker's engineering approach on the Grindor series emphasizes QUICK-POINT grinding technology, a high-speed CBN grinding method that uses a narrow grinding wheel — often just a few millimeters wide — running at very high peripheral speeds. QUICK-POINT grinding allows the wheel to traverse across the workpiece at high feedrates, removing material from the full workpiece length in a series of rapid passes rather than a single wide plunge. This approach reduces grinding forces dramatically compared to wide-wheel plunge grinding, enabling high material removal rates without the deflection and chatter that wide-wheel grinding can produce on slender or flexible workpieces.

The Grindor 2 is built around a high-speed CBN wheel spindle capable of peripheral speeds significantly higher than conventional abrasive grinding — typically in the 80–140 m/s range for QUICK-POINT operations. At these speeds, CBN abrasive operates at its optimal thermal and mechanical cutting conditions, providing long wheel life, consistent surface finish, and predictable dimensional control across long production runs. The machine's headstock and tailstock arrangement supports workpieces in the typical automotive shaft and pin production range, with the workhead drive providing the controlled workpiece rotation needed for consistent helical traverse grinding.

Junker's CNC grinding control integrates with in-process gauging systems that measure workpiece diameter during grinding and feed correction signals back to the machine in real time. This closed-loop diameter control compensates for wheel wear, thermal effects, and material variation, maintaining diameter tolerance without operator measurement intervention between parts. For high-volume automotive camshaft, crankshaft pin, and transmission shaft grinding, this automatic diameter compensation is essential for maintaining process capability indices required by automotive quality programs.