Hillary Machinery supplies horizontal boring mills and CNC boring mills for machining large, heavy and complex workpieces. These machines combine boring, drilling, milling and tapping capabilities with large work envelopes, heavy workpiece capacity and spindle reach for machining features that can be difficult to access on conventional machining centers.
Horizontal boring mills, commonly called HBMs or CNC boring mills, are heavy-duty machine tools designed for machining large, heavy and complex components. Their horizontal spindle orientation and extendable boring spindle allow cutting tools to reach deep features and multiple surfaces of large workpieces.
Horizontal boring mills can perform boring, drilling, milling, tapping and related machining operations while reducing the number of setups required for large components.
A horizontal boring mill is a CNC machine tool with a horizontally oriented spindle designed to machine large workpieces that may exceed the practical capacity of conventional machining centers.
One of the defining capabilities of many HBMs is a programmable boring spindle, or W-axis, that extends from the headstock toward the workpiece. This allows the cutting tool to reach deep bores, internal features and surfaces that would otherwise require repositioning the component.
Depending on the machine configuration, tooling and workpiece, CNC horizontal boring mills can perform operations including:
Hillary Machinery offers Fives Giddings & Lewis horizontal boring mills for demanding large-part machining applications.
Giddings & Lewis boring mill configurations include plain-table, rotary-table and machining-center-style systems, allowing manufacturers to match the machine architecture to workpiece size, production requirements and desired automation.
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Plain-table horizontal boring mills provide a rigid platform for machining large and heavy components. They can be particularly effective when the workpiece requires substantial table capacity, long axis travels or specialized attachments for complex machining operations.
Fives Giddings & Lewis PT Series machines can also be configured with rotary tables, contouring heads, programmable boring bars and other attachments to expand machining capability.
A rotary-table horizontal boring mill allows the workpiece to be indexed so multiple sides can be machined with fewer manual setups. This can improve geometric relationships between machined features while reducing the time required to reposition large components.
Rotary-table configurations are particularly useful for parts requiring boring, drilling and milling operations on several faces.
Some horizontal boring mills incorporate machining-center features such as automatic tool changers and pallet systems. These machines combine the large-part capability of a boring mill with increased automation and reduced non-cutting time.
Fives Giddings & Lewis MC Series machines, for example, combine horizontal boring capability with pallet-shuttle and automatic tool-changing technology for more automated large-part production.
Horizontal boring mills and horizontal machining centers can perform many similar CNC operations, but they are generally optimized for different applications.
A horizontal boring mill is typically selected for larger, heavier workpieces requiring substantial machine travels, heavy table capacity or an extendable boring spindle. A horizontal machining center may be better suited to repetitive production where palletization, automatic tool changing and shorter cycle times are the primary requirements.
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Both machine types can handle large components, but their architectures provide different advantages. A horizontal boring mill approaches the workpiece with a horizontal spindle and can provide significant spindle reach into deep features. A bridge mill uses a bridge or double-column structure with a vertically oriented spindle.
Part geometry, required spindle access, workpiece dimensions and machining operations should determine which configuration is most appropriate.
Horizontal boring mills are frequently selected for components that are difficult, expensive or time-consuming to reposition. Large work envelopes, substantial table capacities and multiple CNC axes allow manufacturers to complete more operations while the workpiece remains fixtured.
This capability can be particularly valuable when maintaining positional relationships between bores, mounting surfaces and other machined features is critical.
CNC boring mills are used throughout heavy manufacturing for components such as:
Selecting an HBM requires evaluating the complete workpiece and machining process. Important considerations include:
HBM commonly stands for horizontal boring mill, a CNC machine tool designed for boring, drilling, milling and machining large workpieces with a horizontally oriented spindle.
On many horizontal boring mills, the W-axis is the programmable movement of the boring spindle itself. Extending the spindle allows the cutting tool to reach deeper into the workpiece without moving the entire machine head or part.
The primary advantages are the ability to machine large and heavy components, reach deep features and machine multiple surfaces while minimizing workpiece repositioning.
A rotary-table HBM incorporates an indexing or rotating table that allows different sides of a workpiece to be presented to the spindle without manually refixturing the part.
Yes. CNC horizontal boring mills can perform milling, drilling, tapping and other machining operations in addition to precision boring.
Begin with the largest and heaviest workpiece, required machining envelope, boring depth, spindle requirements and operations that must be completed. Table capacity, axis travels, spindle size, W-axis travel and available attachments should then be matched to the application.
Hillary Machinery can help evaluate your workpiece dimensions, weight, machining operations, spindle requirements and production objectives to identify the appropriate horizontal boring mill configuration.
View Available Horizontal Boring Mills or contact Hillary Machinery to discuss your large-part machining application.
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