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SBC Linear
Rolled Ball Screw

Rolled Ball Screw

Product catalog summary

Overview: The document provides comprehensive technical data on SBC Precision Rolled Ball Screws, detailing their specifications, manufacturing methods, structural features, and accuracy standards in line with DIN standards.

Specifications: Ball screws are characterized by high efficiency and low friction due to the rolling action of balls between the screw shaft and nut. They support high velocity and acceleration, with a long service life. The document differentiates between rolled and ground screw threads, noting that ground screws offer higher precision.

Structural Features: The ball screw comprises a screw, nut, and balls. It describes contact structures, including four-point and two-point contact, and explains lead angle calculation.

Components: Dimensions of the screw shaft, such as screw diameter, lead, ball diameter, and thread minor diameter, are specified. Nuts are categorized by recirculation method, including return tube, deflector, end-cap, and inner-recirculation types, each suited for specific applications.

Selection Criteria: Key parameters for selecting a ball screw include orientation, payload mass, linear bearing type, frictional coefficient, external load, support method, desired service life, stroke length, operating speed, and motor requirements.

Accuracy Standards: Lead accuracy is categorized by JIS B1192-1997 standards, with grades C0 to C10. The document explains terms like effective thread length, nominal travel distance, and representative travel distance error, detailing permissible lead accuracy errors and mounting surface accuracy for different precision grades.

Tables and Data: Tables outline permissible lead accuracy errors and mounting surface accuracy for various thread lengths and precision grades, providing specific error values for each category.

Mounting Methods and Conditions: Four mounting methods are described, each suitable for different load and speed conditions: Fixed-Fixed, Fixed-Supported, Fixed-Free, and Supported-Supported.

Preload and Torque Specifications: Preload is crucial for removing axial clearance and minimizing displacement under axial load. Key torque-related terms include Dynamic Preload Torque, Actual Torque, Torque Fluctuation, and Reference Torque, following the JIS Standard (B 1192-1997).

Permissible Axial Load: Selection of a screw shaft that will not buckle under maximum axial load is essential. Calculations involve Reference Torque and Torque Fluctuation, considering both buckling load and permissible tensile compressive load.

Permissible Rotational Speed: Critical speed is the maximum speed before the screw shaft's natural frequency causes operational issues. Factors include Minimum Geometrical Moment of Inertia and Safety Factor.

DN Value: Calculated by multiplying the ball circle diameter by the rpm, it determines the maximum permissible rotational speed, which should be less than the critical speed to avoid operational issues.

Technical Specifications and Procedures:

DN Value and Rotational Speed: The DN Value is crucial for determining maximum rotational speed, with exceeding critical speed causing noise and vibration.
Load Rating and Lifetime: The life of a ball screw is defined by the total number of rotations until flaking occurs due to metal fatigue.
Static Safety Factor and Lifetime Calculation: Ball screws can be selected based on static load or required life, with specific safety factors for different machinery types.
Rotational Torque and Travel Distance: Rotational torque is calculated for uniform motion, acceleration, and deceleration.
Motor Selection and Inertia Moment: The motor's rotational speed and torque must align with rated specifications, with calculations for motor resolution and torque provided.
Additional Considerations: Factors such as preload torque, reduction ratio, and angular acceleration are critical for performance and efficiency.

Mounting and Design Precautions:

Ball Screw Mounting: Nut brackets should be designed according to nut type, avoiding disassembly during installation.
Disassembly Cautions: Mishandling can lead to issues with nut position and preload.

Lubrication and Maintenance:

Lubrication Intervals: Vary based on machine conditions, with specific lubricants suggested for different conditions.
Lubricant Selection: Choose based on working conditions like vibration and temperature.

Safety and Surface Treatments:

Dust Proofing: Protect ball screws from debris using seals or bellows.
Anti-Rust Treatments: Raydent and fluorocarbon treatments are available for corrosion resistance.
Safety Nut: Recommended for vertically installed ball screws to prevent load issues if the ball nut fails.

Product Specifications:

Ball Screw Types: Available in various diameters and leads, with precision grades P5 and T7.
Standards Compliance: SBC follows DIN and JIS standards for precision rolled ball screws.

Ordering Information: The document provides a guide on ordering nuts, screw-nut assemblies, and screw shafts, emphasizing the importance of ordering screw-nut assemblies for high accuracy or rigidity requirements.

Key Parameters: Highlights critical parameters such as basic dynamic and static load ratings, maximum lengths, and surface treatment options.

Recommendations: For high precision and rigidity, it is recommended to order screw-nut assemblies, marking the type of surface treatment required and attaching drawings if end machining is necessary.

Catalog excerpts

b Ball Screw Ball Screw Technical Data / / SBC Precision Rolled Ball Screw / Technical Data SBC Precision Rolled Ball Screw / DIN Standard SBC Precision Rolled Ball Screw / / DIN Standard SBC Precision Rolled Ball Screw

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Structures and Classification Structures and Classification The ball screw isis composed of a screw, a nut and balls, Screws are classified by processing and Ball The ball screw composed of a screw, a nut and balls, Screws are classified by processing and Ball Nuts are classified by recirculation method. Nuts are classified by recirculation method. Ball Screw AA ball screw achieves high efficiency even if driving torque is low because balls...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw 1-3. Structure of the Screw Shaft 1-3. Structure of the Screw Shaft b Ball Screw b Ball Screw Ball Screw Ball Screw 2. Nuts 2. Nuts The nut isis classified by Recirculation method. The nut classified by Recirculation method. [Return Tube Type] [Return Tube Type] The most common type. The most common type. AA return plate allows balls to recirculate. return plate allows balls to recirculate. [screw-shaft thread minor diameter...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw [Ball Screw Requirements] [Ball Screw Requirements] b Ball Screw b Ball Screw Ball Screw Ball Screw Selecting aa Ball screw Selecting Ball screw References References Orientationn Orientatio : : HHriziontal / VVrtrcial l oor zontal / ee i t ca Payload mass Payload mass Linear Bearing Type Linear Bearing Type : : Rolling / Sliding Rolling / Sliding Frictional coefficient of the Linear Bearing : : Frictional coefficient of the...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw Accuracy grades C0 ~~C5 are described in the linearity and direction, and C7 ~~C10 in the travel Accuracy grades C0 C5 are described in the linearity and direction, and C7 C10 in the travel distance error in relation to 300mm. By JIS (JIS B1192-1997) distance error in relation to 300mm. By JIS (JIS B1192-1997) b Ball Screw b Ball Screw Ball Screw Ball Screw Lead Accuracy [JIS B1192 - - 1997] Lead Accuracy [JIS B1192 1997] [Representative...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Thread Length Thread Length (mm) (mm) (Unit : : ) ) (Unit [Mounting Surface Accuracy C0] [Mounting Surface Accuracy C0] Precision Grade Precision Grade C0 C0 Supporting Supporting portion portion Supporting Supporting portion portion The part mounting The part mounting section section E: Representative travel distance error E: Representative travel distance error (Unit : : ) ) (Unit Shaft outer diameter Shaft outer diameter Above Above...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw [Mounting Surface Accuracy C2] [Mounting Surface Accuracy C2] Supporting Supporting portion portion The part mounting The part mounting section section Supporting Supporting portion portion Supporting Supporting portion portion Supporting Supporting portion portion ⑧ Screw shaft outer Above ⑧ Screw shaft outer Above Screw Screw diameter diameter Less Less shaft length shaft length Above Above Less Less Above Above Less Less ⑧...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw [Mounting Surface Accuracy C5] [Mounting Surface Accuracy C5] Supporting Supporting portion portion The part mounting The part mounting section section Supporting Supporting portion portion Supporting Supporting portion portion Supporting Supporting portion portion ⑧ Screw shaft outer Above ⑧ Screw shaft outer Above Screw Screw diameter diameter Less Less shaft length shaft length Above Above Less Less Above Above Above Above...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw [Mounting Surface Accuracy C10] [Mounting Surface Accuracy C10] Supporting Supporting portion portion Supporting Supporting portion portion The part mounting The part mounting section section b Ball Screw b Ball Screw Ball Screw Ball Screw [Mounting Surface Accuracy C7] [Mounting Surface Accuracy C7] Supporting Supporting portion portion The part mounting The part mounting section section Supporting Supporting portion portion...

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Technical Data Technical Data Lead accuracy according to DIN6905 standard is specified by tolerance classes which are Lead accuracy according to DIN6905 standard is specified by tolerance classes which are P-Positioning Class Ball Screws and T-Transport Class Ball screws. P-Positioning Class Ball Screws and T-Transport Class Ball screws. b Ball Screw Ball Screw b Ball Screw Ball Screw Ball Screw Lead Accuracy [DIN6905] Lead Accuracy [DIN6905] a Linear Rail System Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data [Cumulative lead variation...

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Linear Rail System a Linear Rail System a Linear Rail System Linear Rail System Linear Rail System Technical Data Technical Data Technical Data Technical Data Ball Screw b Ball Screw b Ball Screw Ball Screw Ball Screw Measuring the Mounting Surface Accuracy Measuring the Mounting Surface Accuracy Support the supporting part of the screw shaft with VVblocks. Set aameasuring instrument on the Support the supporting part of the screw shaft with blocks. Set measuring instrument on the circumference of the screw shaft, and find the largest difference on the dial gauge at several points circumference...

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Rolled Ball Screw

Rolled Ball Screw

Catalog excerpts

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