Vollmer CB 400 / CBF 400

The Vollmer CB 400 / CBF 400 is a pair of CNC sharpening machines for carbide-tipped band saw blades, the kind used for cutting metal. The CB 400 grinds the tooth top and the tooth face. The CBF 400 grinds both tooth sides at once. Vollmer says the two are usually linked into a production line fed from a coil, so a blade passes through one and then the other.

Blade width runs from 13 to 150 mm (0.51 to 5.9 in) and thickness up to 2.0 mm (0.08 in). Tooth pitch is 4.3 to 200 mm (0.17 to 7.9 in), a wide span that covers fine-pitch blades as well as coarse ones for large sections. Grinding speed is up to 20 mm/s.

Geometry is set by the control, not by hand. Hook angle goes from -25° to 25° for face grinding and from -10° to 25° for side grinding, clearance angle up to 25°. On the sides the tangential clearance angle is up to 6° and the radial clearance angle -10° to 12°. Bevels are possible up to 60° at the tooth flank and, as an option, up to 30° at the tooth face. An integrated measuring probe checks the tooth geometry.

Each operation has its own wheel: 150 mm (5.9 in) for the top, 200 mm (7.9 in) for the face and 70 to 100 mm (2.8 to 3.9 in) for the flanks, all on a 32 mm (1.3 in) bore. Vollmer recommends oil as coolant. The brochure gives one connected load, approx. 4.3 kVA / 3.5 kW, and one weight, approx. 2,800 kg (6,173 lb), without saying which machine they describe. Ask for the figures per machine before planning a line.