Linear Guideways & Ball Screws for CNC Machining Centers

Product Specifications

Technical details and manufacturing context for Linear Guideways & Ball Screws

Definition

Linear guideways and ball screws are critical precision components within a Heavy-Duty Aluminum Profile Multi-Axis CNC Machining Center. The linear guideways (rails and carriages) provide rigid, low-friction support and guidance for moving elements along straight paths, ensuring stability and accuracy under heavy loads. The ball screws convert the rotary motion of servo motors into precise linear motion, enabling controlled positioning of the machine's axes (X, Y, Z, etc.) with high repeatability and minimal backlash. Together, they form the core mechanical transmission and guidance system that defines the machine's precision, speed, and load capacity.

These components are available in a range of specifications to suit different machine sizes and performance requirements. Nominal sizes (rail width for guideways, diameter for ball screws) range from 15 to 65 mm. Dynamic load ratings are 10–120 kN (per ISO 14728-1 for guideways; ball screws use ISO 3408), and static load ratings are 15–160 kN (per ISO 14728-2). Travel accuracy grades range from C0 (highest precision) to C5 (standard), per ISO 3408-3. Repeatability is ±0.003 to ±0.02 mm, depending on grade and preload. Maximum travel speed is 60–120 m/min, limited by ball screw critical speed. Operating temperature is -10 to 80°C; above 80°C requires special lubrication. Ingress protection is IP54 to IP65 (per IEC 60529). Rail material is typically GCr15 bearing steel, hardened to 58–62 HRC (per GB/T 18254). Ball screw lead ranges from 5 to 40 mm (per ISO 3408-1), and preload classes are Z0 (no preload) to Z3 (high preload) per ISO 3408-2. Weight ranges from 2 to 15 kg/m for guideways (per meter) and for screws (per kg).

These values are directory reference ranges; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. Standards listed are procurement references and do not imply certification or compliance of any specific product.

Working Principle

Linear guideways operate on the principle of recirculating ball bearings within a carriage that rolls along a hardened steel rail, minimizing friction and wear. Ball screws convert torque: as the screw shaft rotates, precision-ground ball bearings recirculate within the nut, translating rotational force into linear motion along the screw's axis with high mechanical efficiency. The combination of these two components allows precise positioning and smooth motion in CNC machines, with minimal backlash and high repeatability.

Common Materials

High-carbon chromium bearing steel (e.g., GCr15/SUJ2), Case-hardened steel, Stainless steel (for corrosion-resistant variants), Aluminum alloy (for carriage housings)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Size	15–65 mm	Rail width for guideway; diameter for ball screw
Dynamic Load Rating	10–120 kN	For guideway; ball screw uses ISO 3408ISO 14728-1
Static Load Rating	15–160 kN	For guideway; ball screw uses ISO 3408ISO 14728-2
Travel Accuracy Grade	C0–C5	C0 highest precision; C5 standardISO 3408-3
Repeatability	±0.003–±0.02 mm	Depends on grade and preload
Maximum Travel Speed	60–120 m/min	Limited by ball screw critical speed
Operating Temperature	-10–80 °C	Above 80°C requires special lubrication
Ingress Protection	IP54–IP65	Higher IP for dusty or wet environmentsIEC 60529
Rail Material	GCr15	Bearing steel; hardened to 58–62 HRCGB/T 18254
Ball Screw Lead	5–40 mm	Determines speed and resolutionISO 3408-1
Preload Class	Z0–Z3	Z0 no preload; Z3 high preloadISO 3408-2
Weight	2–15 kg/m	Per meter for guideway; per kg for screw

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Linear Guideway Rail
Provides a hardened, precision-ground track for the carriage to move along, ensuring straight-line motion.

Material: Hardened steel (e.g., GCr15)
Linear Guideway Carriage (Block)
Houses recirculating ball bearings and attaches to the moving machine part, rolling along the rail with minimal friction.

Material: Hardened steel, aluminum alloy housing
Ball Screw Shaft
Precision-ground threaded shaft that rotates to produce linear motion via the ball nut.

Material: Hardened steel (e.g., GCr15/SUJ2)
Ball Nut Part
Contains recirculating ball bearings that engage with the screw thread, converting rotary motion to linear movement.

Material: Hardened steel
Ball Return System Part
Internal channel within the nut that recirculates the ball bearings, enabling continuous motion.

Material: Hardened steel, engineering plastic
Wipers/Seals Part
Protect the internal bearing surfaces from dust, chips, and contaminants.

Material: Synthetic rubber, polyurethane

Manufacturers of Linear Guideways & Ball Screws

Manufacturer profiles associated with Linear Guideways & Ball Screws.

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Frequently Asked Questions

What are the typical size ranges for linear guideways and ball screws?

Nominal sizes range from 15 to 65 mm, where for guideways this refers to rail width and for ball screws to diameter. These are reference ranges; the exact size depends on the machine design and load requirements.

What accuracy grades are available for these components?

Travel accuracy grades range from C0 (highest precision) to C5 (standard), per ISO 3408-3. The appropriate grade depends on the required positioning accuracy of the application.

What is the maximum travel speed?

Maximum travel speed is 60 to 120 m/min, limited by the ball screw critical speed. Actual achievable speed depends on the specific screw length, diameter, and support configuration.

What operating temperature range is specified?

The operating temperature range is -10°C to 80°C. Above 80°C, special lubrication is required. Always verify with the manufacturer for the specific model.

Data Basis

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Preliminary Technical Classification

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pressure:	Max 10 MPa (100 bar) static load capacity, dynamic loads typically 30-50% lower
other spec:	Max velocity: 5 m/s for ball screws, 2 m/s for linear guides; Accuracy grades: C0-C10 (2-50 μm/300mm); Preload classes: Light/Medium/Heavy
temperature:	-10°C to +80°C

Linear Guideways & Ball Screws

Product Specifications

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Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards