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Portable Linear Milling Solutions for On-Site Machining

JDA Machinery provides portable linear milling machines for machining large, heavy, or installed components that are difficult to transport to a conventional machine shop.

Four configurations are available, with nominal X-axis strokes from 1,000 mm to 5,000 mm. Model selection depends on the required machining envelope, workpiece geometry, mounting conditions, cutting requirements, and specified accuracy.

JDA Machinery can assess project drawings, machining dimensions, and site conditions to help determine a suitable machine configuration and identify any additional mounting, drive, or engineering requirements.

Onsite Milling Machine
The JDA PB6000 Onsite Milling Machine is a portable linear milling system designed for machining flat surfaces, weld beads and keyways directly at the worksite. Its 6.5 m longitudinal milling...
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Field Milling Machine
The JDA PC1500 Field Milling Machine is designed for industrial field machining where transporting large workpieces to a conventional machine shop is impractical. It performs surface milling, weld...
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Technical Comparison Matrix

Specification	LMM-1000	LMM-2000	LMM-3000	LMM-5000 Modular
Maximum X-axis stroke	1,000 mm	2,000 mm	3,000 mm	5,000 mm
Y-axis adjustment	150 mm	250 mm	300 mm	400 mm
Spindle taper	NT40	NT40 / NT50	NT50	NT50
Spindle speed	0–800 rpm	0–600 rpm	0–600 rpm	0–500 rpm
Maximum cutter diameter	125 mm	160 mm	200 mm	250 mm
Flatness tolerance	≤0.02 mm/m*	≤0.02 mm/m*	≤0.25 mm/m*	≤0.03 mm/m*
Main body weight	180 kg	420 kg	780 kg	1,350 kg

Which Linear Milling Machine Fits Your Project?

Choose the model according to the machining envelope, installation conditions, and required cutting performance—not stroke length alone.

Model	Primary Selection Consideration	Confirm Before Ordering
LMM-1000	Shorter linear machining tasks requiring up to 1,000 mm nominal X-axis travel	Required cutting length, cutter access, and mounting space
LMM-2000	Projects requiring more travel than the LMM-1000 can provide	Full machining envelope, support arrangement, and workpiece rigidity
LMM-3000	Longer machining surfaces requiring up to 3,000 mm nominal travel	Alignment over the full stroke, cutting loads, and required accuracy
LMM-5000 Modular	Extended linear machining requiring up to 5,000 mm nominal travel	Extension layout, joint alignment, support spacing, and accuracy across the assembled bed

Industrial Application Scenarios

Marine and Shipbuilding

Potential applications include suitable engine mounting surfaces, equipment seating areas, and accessible linear interfaces on large marine structures. Machining feasibility depends on the target geometry, material condition, installation access, and inspection requirements.

Oil, Gas, and Petrochemical Facilities

The equipment may be evaluated for selected equipment bases, structural interfaces, and maintenance surfaces. Projects in classified hazardous areas require confirmation of the complete machine configuration and its suitability for the site's specific safety requirements.

Power Generation

Potential applications include selected equipment mounting surfaces, support interfaces, and accessible linear features requiring repair or refurbishment. Confirm the machining envelope, reference datums, workpiece stability, and required inspection criteria.

Mining and Heavy Manufacturing

Portable milling may be considered for suitable machine bases, guide surfaces, support structures, and other large components that are impractical to transport. Wear depth, material condition, cutting loads, and required surface geometry determine whether the proposed configuration is appropriate.

Machine Construction and Technical Configuration

The machine configuration should match the cutting load, machining length, workpiece material, and site conditions.

Component	Selection Considerations
Machine bed and linear guidance	Structural rigidity, guide accuracy, mounting stability, and support requirements over the full machining length
Spindle and cutter interface	NT40 or NT50 taper, toolholder compatibility, cutter diameter, available torque, and cutting conditions
Drive and feed system	Required feed control, cutting performance, available power supply, and site operating conditions
Mounting and alignment	Workpiece geometry, available fixing points, installation orientation, and alignment references

Custom Engineering and Optional Accessories

Customization Option	Available Solutions	When Is It Needed?
Mounting Bases and Fixtures	Bolted bases, fabricated mounting plates, leveling fixtures	When the workpiece lacks suitable mounting surfaces or fixing points, or when additional support and precise alignment are required.
Special Milling Heads	Right-angle milling heads, application-specific spindle orientations	When the target surface is inaccessible with the standard spindle orientation, such as side faces, recessed areas, or restricted machining locations.
Modular Bed Extensions	Additional bed sections for extended linear travel	When the required machining length exceeds the standard machine stroke and an approved modular extension configuration is available.
Drive and Feed Configuration	Model-dependent drive options and feed-control configurations	When the site's available power supply, required feed control, or cutting conditions are not compatible with the standard configuration.
Special Mounting Arrangements	Engineered fixtures for approved vertical or non-standard mounting orientations	When the machine must be installed vertically, overhead, or on an irregular structure, requiring specific load-bearing, retention, and alignment provisions.

Mounting and On-Site Installation

Successful on-site machining depends on a stable mounting arrangement and accurate alignment with the target surface.

Before installation, confirm:

Mounting: Suitable fixing points, structural load capacity, and a secure arrangement for the intended machining orientation.

Alignment: Reference datums, guide alignment, support spacing, and alignment verification across the working stroke.

Access: Available working space, cutter approach, tool changes, operator access, and clearance for the assembled machine.

Site utilities: Required electrical or other power connections, environmental conditions, and applicable site safety controls.

For confined spaces, irregular mounting surfaces, or vertical and overhead applications, provide site photographs and dimensional drawings for assessment before ordering.

Engineering Materials and Quality Verification

Material specifications, component brands, and inspection requirements should be confirmed for the selected machine configuration.

JDA Machinery's technical documentation for the applicable model should identify the relevant construction materials, spindle and bearing specifications, drive components, and available accessories.

For projects with defined accuracy requirements, establish the acceptance criteria before ordering. The verification plan should distinguish between:

Factory inspection

Checks applicable to the assembled machine and its specified components.

Installation verification

Checks of mounting stability, alignment, and setup under actual site conditions.

Finished-workpiece inspection

Measurement of the machined surface against the agreed drawing tolerances and inspection method.

FAQ

Q: How do I choose the correct machining stroke?

A: Start with the full length of the surface to be machined, including any required tool approach, positioning allowance, and setup constraints. Then confirm the usable travel of the selected machine and whether the mounting arrangement provides access to the entire target surface.

Q: How is machining accuracy maintained over long travel lengths?

A: Accuracy depends on machine rigidity, guide condition, mounting stability, bed support, alignment, cutting forces, and the measurement method. Modular systems also require proper alignment at extension joints.

Q: Can the machine be used in refineries, offshore facilities, or hazardous areas?

A: Suitability depends on the site's hazardous-area classification and the complete machine configuration, including its drive, controls, accessories, and applicable protective measures.

Q: Can the machine be installed vertically or inverted for overhead milling?

A: Only use a configuration explicitly approved for the intended mounting orientation. Engineering assessment must address structural retention, guide and bearing loads, cutting forces, fastener capacity, and the consequences of support failure.

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