A machine axis may carry more than the weight of its moving table. Cutting force, an offset workpiece, rapid acceleration and the distance between guide blocks can all produce additional deformation and moment load. A roller type linear guideway is intended for applications where controlling this structural deformation is a primary design requirement.
Cylindrical rollers support the moving structure through a larger contact region with the raceway. When the guide arrangement, preload and mounting surfaces are correctly specified, this structure can provide stable guidance for heavy worktables, machining axes, long-travel equipment and mechanisms exposed to substantial overturning moments.
DLY supplies roller linear guide configurations with square or flange blocks, selectable preload and accuracy, custom rail lengths and different block quantities. Specific RDH and RDW models are listed on the RD Square Guideway page.
Suitable Operating Conditions
A roller guideway should not be selected only because a machine is described as heavy duty. The applied force, load position, guide spacing and required rigidity must be considered together. It is commonly evaluated under the following operating conditions.
| Operating condition | Why a roller guideway may be considered |
|---|---|
| Heavy moving table | Supports worktables, fixtures and workpieces where guideway deformation must be limited under sustained load. |
| Machining force | Provides a rigid support path for axes exposed to cutting, grinding or other process forces. |
| Offset load | Helps support moment loads created when the load center is positioned away from the guideway arrangement. |
| Long machine travel | Suitable for machine structures that require stable support along an extended travel axis. |
| Vertical or overhung axis | Allows radial, reverse-radial and lateral loads to be considered within a multi-direction guide arrangement. |
| Changing operating load | Can be evaluated for equipment exposed to repeated changes in load direction or magnitude. |
Selection note: A roller guideway is not automatically required for every industrial axis. A ball-type guideway may remain appropriate where load, rigidity and moment requirements are moderate. The final choice should be based on load calculation, machine structure, speed and required running characteristics.
Structure
The guide block combines a load-carrying roller circuit with lubrication and contamination-protection components. These systems must work together to maintain consistent movement under the specified preload and operating conditions.
Roller circulation
The block, rail, cylindrical rollers, end caps and return path form a recirculating system that supports continuous linear travel.
Lubrication
A grease nipple and internal lubrication path deliver lubricant to the rolling contact region. The relubrication method should match the operating cycle and machine layout.
Protection
End seals, bottom seals, rail-hole caps and optional scrapers help limit the entry of chips, dust and other contaminants.
Available Configuration
The guideway should be configured as part of the complete machine structure. Block form, block quantity, rail length, preload and accuracy should be confirmed together rather than selected independently.
For available sizes and the distinction between square and flange blocks, refer to the DLY RD Series. The model page provides the series-specific information, while final selection should still be checked against the actual machine layout and load conditions.
Processing and Inspection
Roller guideway performance depends on more than the nominal size. Raceway geometry, reference-surface accuracy, block assembly and preload consistency all influence how the guideway runs after installation.
Three-side rail grinding allows the raceway and mounting reference surfaces to be processed with controlled geometric relationships. Depending on the order specification, inspection may include:
- Rail width and height-related dimensions
- Reference-surface condition and raceway finish
- Rail straightness and running parallelism
- Block height and width consistency
- Preload and running resistance
- Roller circulation and smooth movement after assembly
The mounting surfaces of the machine must also be sufficiently flat, straight and parallel. A high-accuracy guideway cannot compensate for an incorrectly machined base or improper tightening sequence.
Application Requirements
Roller linear guides are used in several types of industrial equipment, but the reason for selecting them differs with the machine structure. The following examples show typical requirements rather than fixed model recommendations.
CNC Machining Center
Used on feed axes that must support the worktable, fixture and machining load while limiting movement under cutting force.
Automation Equipment
Considered for transfer and positioning axes carrying large tooling, offset payloads or changing moment loads.
EDM Machine
Suitable for motion structures requiring stable worktable support and controlled low-speed feed under load.
Large Gantry Machine
Applied to long-travel or wide-span structures carrying heavy crossbeams, worktables or machining assemblies.
DLY Supply Support
DLY has manufactured linear motion components since 2005 and operates a production facility covering more than 30,000 square metres. Roller guideway orders can be discussed according to the machine drawing and operating requirements.
- Square and flange block configurations
- Standard or custom rail length
- Specified block quantity per rail
- H, P, SP and UP accuracy options
- Preload configuration according to operating requirements
- Rail and block inspection before packaging
- Sample and production-order support
Packaging
Before packing, the product model, rail length and block quantity are checked against the order information. Guide rails are protected with anti-rust treatment and wrapping, while the blocks are secured to avoid uncontrolled movement during handling. The outer packing method is selected according to rail length, order quantity and transportation requirements.
FAQ
Q: When should a roller type linear guideway be selected?
A: It can be considered when a machine axis is exposed to heavy sustained load, machining force, substantial moment load or strict rigidity requirements. Selection should be confirmed through the complete load and installation arrangement.
Q: Does a roller guideway always replace a ball guideway?
A: No. Ball guideways may be more appropriate for machines with moderate loads, compact structures or different running requirements. The guide type should be selected according to load, rigidity, speed, friction and installation conditions.
Q: How many blocks should be installed on each rail?
A: The quantity depends on the load distribution, moment load, table dimensions, rail spacing and required rigidity. Two rails with two blocks per rail are common, but this arrangement should not be treated as a universal rule.
Q: Can the rail length and block quantity be customized?
A: Yes. Rail length and block quantity can be supplied according to the machine layout, subject to model availability, manufacturing and transportation conditions. Please provide the required rail length and quantity when requesting a quotation.
Q: How should a roller guideway be lubricated?
A: The lubricant, quantity and relubrication interval depend on speed, stroke, load, operating time and environmental contamination. Manual grease supply or connection to a centralized lubrication system can be considered according to the equipment design.
Confirm Your Roller Guideway Configuration
Send the machine drawing, load, travel, rail length, block quantity, accuracy and preload requirements to DLY for technical confirmation and quotation.
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