Ball screws
Ball screws
PMI Group, founded in 1990, specializes in manufacturing precision components such as ballscrews, linear guideways, and mono stages for industries like machine tools and semiconductor equipment. The company prioritizes quality and environmental responsibility, adhering to the RoHS Green Environmental System.
PMI is dedicated to reducing pollution and improving energy efficiency, promoting the ROHS green system and energy management systems to ensure compliance and environmental protection.
PMI emphasizes prompt delivery, continuous improvement, and customer satisfaction, ensuring product reliability and accuracy through a comprehensive production management system.
Ballscrews: PMI offers precision ground and rolled series, known for high reliability, accuracy, and efficiency, made from alloy steels with surface hardening.
Linear Guideways: Designed for high precision and efficiency, with options for dustproofing and lubrication.
Mono Stage: The KM series features specifications on construction, load ratings, and accuracy grades for high-speed travel and long service life.
Detailed specifications for each product type include lead accuracy, torque, and design considerations, along with installation and maintenance guidelines.
The document details permissible rotational speeds of ballscrews, influenced by factors like natural frequency and Young's modulus, with calculations based on safety factors and mounting methods.
Includes thread design, machine design, and support for long ballscrews to prevent bending and radial load issues.
Focuses on type selection, axial load calculation, and the impact of abnormal loads on performance and lifespan.
Discusses axial and torsional rigidity, preloading methods, and their importance for positioning accuracy.
Includes figures illustrating permissible rotational speeds, rigidity, and preloading methods, and tables detailing effective turns and axial rigidity values.
Preload should be set to 1/3 of axial load to avoid excessive temperature rise and reduced lifespan, enhancing rigidity.
Errors can arise from lead error, rigidity issues, and thermal deformation. Recommendations include pretensioning, controlling temperature, and using closed-loop positioning control.
Defined by fatigue and accuracy life, with guidelines for calculating life based on revolutions, operating time, and travel.
Outlines permissible load on thread grooves and the importance of material hardness, with adjustments for hardness less than HRC58.
Recommends lithium-based lubricants and dustproofing measures like wipers and screw covers.
Discusses driving torque requirements, emphasizing that it should not exceed 30% of the motor's rated torque.
Technical analysis and selection process for ballscrews, focusing on design specifications, motion conditions, and a hollow cooling system for enhanced performance.
Outlines conditions like table weight, workpiece weight, maximum travel, and life expectancy.
Involves determining accuracy grade, screw diameter, lead, and motor specifications.
Controls thermal expansion using a coolant pipe, minimizing thermal deformation and ensuring positioning accuracy.
Features scrapers and seal washers for enhanced dust removal and durability.
Offer a smaller outer diameter, suitable for machines with limited space.
Detailed specifications for precision ground ballscrews, focusing on models and technical parameters.
High rigidity, low noise, space efficiency, and high DN value.
Suitable for CNC machinery, precision machinery, high-speed machinery, semiconductor equipment, and medical equipment.
Emphasizes high lead characteristics, thermal control, and low noise.
Offer lower noise and smoother ball circulation, suitable for high lead or large diameter ballscrews.
Includes tables detailing specifications of various ballscrew models.
Detailed specifications for high lead ballscrews, focusing on different product models.
Includes screw size, ball diameter, effective turns, and load ratings.
Focuses on advancements in ballscrew design, particularly the FSVH and FSDH circulation systems.
Suitable for heavy load applications, with mounting recommendations to ensure even load distribution.
Includes diagrams illustrating circulation systems and load distribution effects.
General specifications, load ratings, axial play, and preloading details.
PMI rolled ballscrews are produced using advanced manufacturing processes, ensuring high-quality products.
Detailed specifications for various models, categorized by screw diameter and lead.
Includes technical parameters like number of threads, ball diameter, and preloading torque.
High dynamic and static load capacities, precise lead accuracy, and effective turns configuration.
Detailed technical specifications and features of PMI Rolled Ballscrews, highlighting precision and manufacturing process.
Advanced digital electric screw thread rolling machines ensure high-quality rolled products.
High precision rolled nuts, interchangeable nuts, and adherence to ISO standards.
Tables detail lead accuracy grades and maximum rolled lengths.
Standard materials and hardness specifications for screws and nuts.
Lists various screw sizes, lead accuracies, and maximum rolling lengths.
Standard and optional nut models with order codes.
PMI Rolled Ballscrews offer a range of specifications and features suitable for various applications.
Detailed specifications for FA Series Ballscrews, focusing on models with different screw diameters and leads.
Lists models with specific screw diameters and leads, including load capacities and accuracy grades.
Calculated according to ISO standards, with dynamic and static load capacities provided.
Specifies lead accuracy tolerances and radial runout.
Includes incomplete threads, wipers, and oil holes.
Provides dimensional drawings for installation and integration.
FA Series Ballscrews are designed for high precision and load-bearing applications.
Analysis of service problems related to ball screws, focusing on common issues, causes, and preventive measures.
Includes detailed specifications for ball screws, ensuring proper fit and function.
Identifies issues like unsmooth operation, excessive play, and fractures, with preventive measures.
Discusses temperature effects on accuracy and performance, with recommendations for preload and lubrication.
Provides tables of dimensional tolerances for shafts and holes.
Catalog excerpts
PMI Linear Motion Systems Ballscrews / Linear Guideway / Mono Stage General Catalog
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COMPANY INTRODUCTION PMI GROUP was established in 1990. It's highly involved in manufacturing of ballscrews, linear guideway and mono stage, which is the critical component of precision machinery and mainly applied to Machine Tool, Electric Discharging Machine, Cutting Wire Machine, Plastics Injection Machine, Semi-conductor Equipment, Precision Orientation Equipment and other equipments and machines. Recent years, PMI Group places great emphasis in upgrading not only the manufacturing and quality of products but also the manpower. In addition to comply with requirement of quality management...
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Environment Policy PMI devotes in research & developing and manufacturing of Precision Linear Motion Components. To provide world class levels of service, quality and learning through our innovative business philosophy, that is integral to all PMI's transmission components and services. To protect the environment and personal safety by more actively promoting and implementing the ROHS green system, ESH and energy management systems. To meet or exceed regulatory levels for emission and waste control, within a labor-friendly work environment that utilizes the latest energy reduction technology...
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We promise and are devoted to implement the following environmental and energy policies: 1. By reducing pollution and continually improving our energy usage performance, PMI can simultaneously minimize accidents and sickness whilst achieving regulatory compliance. 2. PMI develops GREEN products, strengthen risk and energy management. 3. Purchase energy-saving products, improve the design of the energy performance. 4. Every department participates preserving our environment, energy awareness, and the prevention of injuries, diseases and the reduction of energy consumption. Based on the above descriptions,...
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PRODUCT INFORMATION Precision Ground Series Internal Ball Circulation Series FSIC End Deflector Series FSDC
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Precision Ground Series External Ball Circulation Series FSWC
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Precision Ground Series High Lead Series
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Rolled Series External Ball Circulation Series FSWW
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Rolled Series internal Ball Circulation Series FSIW
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Standard type series FA Series Miniacture Series FSMC Blank Shaft End Series PPR
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6.1 Service life of ballscrew 6.2 Fatigue life of ballscrew 6.3 Permissible Load on Thread Grooves 2.3 Tolerances on Various Areas of PMI Ballscrew 6.5 Heat Treatment Inspection certificate 2.4 Standard tolerance of accuracy measuring of ballscrew 2. Lead Accuracy and Torque A22 A28 3. Design of Screw Shaft A40 3.1 Production Limit Length of Screw Shaft 3.3 Permissible Axial Load 7.1 Operating Torque of Ballscrrew 7.2 Drive Torque of Motor 3.4 Permissible Rotational Speed 3.5 Notes on Screw Shaft 9. Nomenclature of ballscrew 9.1 Nomenclature of External Circulation Ballscrew 9.2 Nomenclature...
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11. Hollow Cooling System of ballscrews A118 11.1 Introduction to Hollow Cooling Screw Shaft 11.2 Patent of Hollow Cooling Screw Shaft 12. PMI 's High Dustproof Series A124 12.1 Ball Screw of High DustproofType 1 12.2 Ball Screw of High DustproofType 2 12.3 Ball Screw of High DustproofType 3 13. PMI 's Precision Ground Ballscrew 13.1 Internal Ball Circulation Series 14.1 Introduction to Rolled Ballscrew 14.2 Features of PMI 's Rolled Ballscrew 14.3 Lead Accuracy (e300) of Rolle Ballscrrew 14.4 Reference Table of the Nominal Outer diameter and Lead of the PMI 's Rolled Screw Shaft 14.7 Types and...
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CONTENTS B. Linear Guideway B4 1. The Characteristics of PMI Linear Guideways 12. Introduction of Each Series 12.1 Heavy Load Type, MSA Series 2. The Classification Chart of PMI Linear Guideways 12.2 Compact Type, MSB Series 12.3 Full Roller Type, MSR Series 3. The Procedure of Select Linear Guideway 12.4 Miniature Type, MSC、MSD Stainless Steel Series 4. Load Rating and Service Life of Linear Guideway 12.5 Ball Chain Type, SME Series 12.6 Roller Chain Type, SMR Series 12.7 Wide Rail Type, MSG Series 4.1 Basic Static Load Rating C0 4.2 Static Permissible Moment M0 4.3 Static Safety Factor fs 4.4...
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Mono Stage C9 F. Static Permissible Moments C11 H. Maximum Travel Speed and PMI Ballscrew Request Form PMf Linear Guideway Request Form Service Life Calculation of PMI Linear Guideway
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Features of PMI Ball screws PMI has accumulated many years experience in production managing. It covers the whole production sequence, from receiving the order, designing, material preparation, machining, heat treating, grinding, assembling, inspection, packaging and delivery. The systemized managing ensures high reliability of PM/Ballscrews. PM/Ballscrews are machined, ground, assembled and Q.C. inspected under the constant temperature control (20°C) to ensure high precision of Ballscrews. Fig.1.1 accuracy inspection certificate. %kPMI BALLSCREW INSPECTION CERTIFICATE ™ -^AL-iJr Inspected by...
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PMI Ballscrews are Alloy steels, which are well quenching and tempering treated for good rigidity, along with suitable surface hardening to ensure long durability. (4) High working efficiency Balls are rotating inside the Ballscrew nut to offer high working efficiency. Comparing with the traditional ACME screws, which work by friction sliding between the nut and screw, the BALLSCREWS Features of PMI Ballscrews Ballscrews needs only 1/3 of driving torque. It is easy to transmit linear motion into rotation motion. (5) No backlash and with high rigidity The Gothic profile is applied by PMI Ballscrews....
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Lead Accuracy and Torque 2.1 Lead Accuracy PMI 's precision ground Ballscrews are controlled in accordance with JIS B 1192. The permissible values and each part of definitions are shown below. (T+E) Fig.2.1 Technical Terms Concerning the Lead Cumulative Representative Lead Actual Travel Nominal Travel Specified Travel
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Total relative lead variation Maximum width of variation over the travel length. Lead deviation in random 1 revolution 2π rad. Accumulated reference lead deviation. This is allowable deviation of specified travel. It is decided by both of the accuracy grade and effective thread length. Specified travel. This value is determined by customer and maker as it depends on different application requirements. Lead deviation in random 300 mm. Actual value. Permissible value. Cumulative representative lead. A straight line representing the tendency of the cumulative actual lead. This is obtained by least...
Open the catalog to page 23All PMI catalogs and technical brochures
Mono Stage70 Pages
Linear Guideway236 Pages
- Linear axis
- Guide rail
- Screw linear axis
- Screw spindle linear axis
- Precision ball screw
- Slide rail
- Steel ball screw
- Rolled ball screw
- Roller rail
- Ground ball screw
- Ball bearing rail
- Precision rail
- Heavy load ball screw
- Recirculating ball screw
- High-speed ball screw
- Miniature ball screw
- High-rigidity ball screw
- Thread whirled ball screw
- Heavy load rail