Why upgrading to a 130‑class boring mill makes sense
Many job shops today operate older 110‑class boring machines or rely on separate machining centers for milling and boring of large parts. As workpieces grow in size – gearboxes weighing 5–8 tons, flanges with 2‑meter diameters, or large valve bodies requiring deep bores – the limitations of smaller machines become costly. The HTC6513D addresses these limitations with a combination of extended travels, high torque, and a large‑capacity indexing table, all at a price that respects tight budgets.
Application 1: Large gearbox housings
A typical gearbox housing for industrial drives may weigh 6–8 tons and require machining of bearing bores, bolt hole circles on multiple faces, oil passage drilling, and locating surfaces. On a conventional 110‑class machine, operators often need to reposition the workpiece two or three times – each repositioning introduces alignment errors and consumes non‑cutting time. With the HTC6513D, the 800 mm W‑axis extension allows the boring bar to reach deep into the housing without moving the part. The 0‑360° indexing table (10,000 kg capacity) can rotate the workpiece to any angle, enabling all side features to be machined in one setup. Field experience with similar parts suggests a cycle time reduction of 20–30% compared to multi‑setup processes, while positional accuracy between bores on different faces improves by eliminating re‑clamping errors.
Application 2: Large flanges and ring parts
Flanges for wind towers, pressure vessels, or large pipe systems often have diameters exceeding 1,500 mm and require a combination of turning (if the machine has turning capability – the HTC6513D is primarily a boring mill, but it can interpolate large diameters via circular interpolation), milling of keyways or locating flats, and drilling of bolt hole circles. The HTC6513D excels at the milling and drilling portion. The heavy‑duty roller guides (65 mm on all axes) provide enough rigidity for face milling large surfaces without chatter, while the precise indexing table ensures accurate bolt circle division. The W‑axis is particularly useful for reaching the inner flange faces or for boring through‑holes in thick‑wall flanges.
Application 3: Heavy structural components and mold bases
For mold bases, machine frames, or press components, the challenge is often not just precision but also material removal rate. Cast iron and steel weldments can exceed 8 tons, and removing large amounts of material efficiently requires a stiff machine with high torque. The HTC6513D delivers 2,500 N·m of spindle torque and 30 kW of power, allowing heavy milling cuts with standard indexable tools. The nitrogen counterbalance on the Y‑axis and the pre‑tensioned ball screws maintain stable feed even under heavy cutting loads. The two chip conveyors (left and right of the table) handle large chip volumes, reducing downtime for manual cleaning.
Technical features that make the difference
65 mm roller linear guides – Larger than typical guides in this class, they provide exceptional load capacity and vibration damping. The X‑axis uses three guides with ten slide blocks, distributing the load of heavy workpieces evenly and preventing table deflection.
63 mm pre‑tensioned ball screws – Double‑end fixed support with bidirectional pre‑tension minimizes thermal growth effects and ensures high positioning repeatability over long working hours.
Nitrogen counterbalance – Lightweight, responsive, and maintenance‑free compared to hydraulic or chain‑weight systems. It reduces Y‑axis motor load and improves energy efficiency.
Siemens 828D with 4‑axis simultaneous interpolation – Enables complex contour milling, helical interpolation, and efficient 3+1 axis machining. The control also supports rigid tapping, tool length/radius compensation, and advanced program management.
Heavy‑duty rotary table with circular time‑grating – Provides 0‑360° indexing with high accuracy. The table is supported by a full circle of cylindrical roller bearings, giving smooth rotation even under heavy off‑center loads.
Total cost of ownership benefits
Investing in the HTC6513D means fewer machines, less floor space, and lower tooling costs. A single setup on the HTC6513D often replaces two or three setups on smaller machines or separate equipment. This reduces:
Labor time for clamping and alignment
Workpiece damage risk from multiple handling
Cutter investment (no need to duplicate tooling across machines)
Quality control effort (fewer datum transfers)
For a typical 8‑ton gearbox housing, the total processing time (including setup) can be reduced from approximately 8–10 hours on conventional equipment to 5–6 hours on the HTC6513D, representing a 30–40% reduction in machine time. When multiplied over hundreds of parts per year, the savings quickly justify the machine investment.
Why HAIDI Machine can offer this at a competitive price
The HTC6513D uses regionally sourced high‑grade cast iron with proper aging and stress relief, proven Taiwanese/domestic ball screws and linear guides, standard Siemens CNC components, and well‑designed hydraulic and cooling systems. There are no exotic materials or over‑engineered features that add cost without real‑world benefit. The result is a machine that delivers 130‑class performance at a price that does not require a premium budget.
Support and documentation
Each HTC6513D comes with a standard one‑year warranty, on‑site installation and training, and a complete set of documentation including operation manuals, maintenance guides, electrical diagrams, and a quality certificate. Optional remote diagnostic support can be arranged for shops that prefer proactive maintenance planning.
➡️ To discuss how the HTC6513D fits your specific part mix, request application test data, or ask for a competitive quotation, click here to speak with our application engineering team.