Ball screws
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PMI Linear Motion Systems Ballscrews / Linear Guideway / Mono Stage General Catalog

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...

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...

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...

PRODUCT INFORMATION Precision Ground Series Internal Ball Circulation Series FSIC End Deflector Series FSDC

Precision Ground Series External Ball Circulation Series FSWC

Precision Ground Series High Lead Series

Rolled Series External Ball Circulation Series FSWW

Rolled Series internal Ball Circulation Series FSIW

Standard type series FA Series Miniacture Series FSMC Blank Shaft End Series PPR

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...

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...

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...

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

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...

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...

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

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...