TOS WHN 110

The primary difference is boring spindle diameter: WHN 110 has a 110 mm spindle; WHN 130 has a 130 mm spindle. A larger spindle diameter provides: greater boring bar support diameter for larger-diameter boring bars; higher torque capacity for aggressive milling of large faces; better rigidity for deep boring at large L/D ratios; and higher spindle power (37 kW vs 60 kW). For workpieces requiring bores under 300 mm at depths under 500 mm, the WHN 110 provides adequate rigidity. For bores 300–600 mm at depths 400–800 mm on heavy cast iron workpieces, the WHN 130's higher spindle power and larger bar support are recommended. Price difference is approximately $150,000–$400,000 between the two models.

Horizontal boring machine tooling types: Boring bars (single-point or multi-point insert bars for precise diameter boring); face milling cutters (50–630 mm diameter for flat face milling of large surfaces); rough boring heads (adjustable diameter boring bars for rapid rough boring passes); fine boring heads (micro-adjustable boring bars for precise diameter control in finish boring); live tooling (where machine supports rotating tools for drilling, milling, tapping); and special applications (thread milling, counterboring, reaming). All tooling connects to the 110 mm spindle through standard tool interfaces (BT50, ISO50, or capto — depending on spindle design). TOS provides machine-specific tooling recommendations for each workpiece family.

The face plate (or facing head) is a large rotating disc mounted on the front of the boring head, providing an additional axis (U-axis) for offset boring. By mounting a boring insert on the face plate offset from center, the operator can bore large diameters (larger than the boring bar diameter) by rotating the face plate through the full revolution. Face plate boring enables producing precision bores of 100–1,250 mm diameter without a boring bar that spans the full diameter. Applications: large valve bores; bearing housing bores in large frames; and any application where the bore diameter significantly exceeds standard boring bar capacity.

Rough boring 200 mm in gray cast iron at 400 mm depth: 3 passes (rough, semi-finish, finish). Rough pass: 180 mm diameter boring bar at 100 m/min surface speed = 177 RPM, 0.5 mm/rev feed = 89 mm/min, 400 mm depth = 4.5 minutes. Semi-finish: similar parameters, 2 minutes. Finish pass: 195 mm fine boring head at 50 m/min = 82 RPM, 0.1 mm/rev = 8.2 mm/min, 400 mm = 49 minutes. Total boring time: approximately 56 minutes per bore. For a gearbox housing with 6 such bores: 6 hours of boring time plus setup, fixturing, and repositioning. Actual production time depends heavily on workpiece complexity, number of repositioning operations, and whether rotary table is used.

TOS Varnsdorf manufactures the WHN 110 under ISO 9001:2015 quality management system certification. Machine accuracy is verified against ISO 230-1 (geometric accuracy of machine tools) before shipment — WHN 110 positioning accuracy (±0.006 mm) is tested and documented in the machine's accuracy protocol delivered with each machine. For precision boring applications, buyers should request the accuracy protocol and verify the measured values match the specification. TOS provides a standard 12-month warranty with their global dealer network handling warranty claims. Extended warranty and service contracts are available through authorized TOS dealers.