CNC boring mill TK6920A

horizontalfloorfor large workpieces

Product Overview
The TK6920A is a high-capacity CNC floor boring and milling machine from the TK Series, designed for large-scale turning, facing and grooving operations on oversized and heavy workpieces. Built with a rigid three-support spindle it delivers high vibration resistance and cutting stability for both roughing and finishing machining.

Key Features

• Wide swing diameter support up to φ3000 mm for oversized parts
• Three-point spindle support for high rigidity and precision during deep cuts
• Suitable for both roughing and precision finishing operations
• Forced lubrication system to reduce thermal wear and extend service life
• Efficient chip evacuation design to improve workflow and reduce downtime
• CNC programmable for complex paths and multi-surface operations

Main Machine Data (from model details)

• Max. swing diameter over machine bed: 1250 / 1600 / 2000 / 2500 / 3000 mm
• Max. swing diameter over cutting tool carriage: 800 / 1250 / 1600 / 2000 / 2500 mm
• Max. workpiece weight: 2 / 3 T
• Max. workpiece length: 500 / 750 mm

Recommended Configurations

• Auto tool turret: enables quick change between roughing and finishing tools
• Hydraulic steady rest: stabilizes long or heavy cylindrical parts during cutting
• Programmable tailstock: provides additional support for shaft-type components
• High-torque spindle motor: delivers constant power at low speeds for heavy cuts
• Heavy-duty chip conveyor: optimizes chip flow and machine cleanliness
• Operator protection enclosure: ensures safety during large-part operation

Application Case

• Client: Wind turbine hub manufacturer (Spain)
• Use case: Boring and facing large-diameter cast steel hubs for wind turbine rotors
• Setup: TK6920A equipped with hydraulic tailstock, chip conveyor and enhanced coolant system
• Results: Dimensional tolerance ±0.02 mm across 2.4 m diameter; continuous machining 12+ hours per setup; tool change efficiency improved by ~40%; client reported improved speed and surface finish on heavy castings

Performance & Accuracy

• Positioning accuracy: typically within ±0.01–0.02 mm (depending on configuration and tooling)
• Repeatability: typically within ±0.008 mm
• Surface roughness achievable: Ra 0.8–1.6 μm (depending on cutting system and tooling)

Technical specifications

• Model: TK6920A (TK Series)
• Three-support (three-point) spindle structure for high rigidity
• Wide swing diameter configurations: up to φ3000 mm
• Workpiece capacity: up to 2–3 tonnes (depending on variant)
• Max. workpiece length options: 500 mm or 750 mm
• Forced lubrication system to minimize thermal wear
• Efficient chip evacuation design
• CNC control for complex multi-surface machining
• Typical achievable tolerances: positioning ±0.01–0.02 mm; repeatability ±0.008 mm; surface roughness Ra 0.8–1.6 μm