PMI (Precision Motion Industries), established in 1990, is a Taiwan-based manufacturer of precision motion components. Its linear guideways are widely used in machine tools, industrial robots, semiconductor equipment, and automation systems, offering high precision, low friction, and long service life.
Core Technical Advantages
PMI linear guideways utilize a rolling motion design where steel balls circulate between the carriage and rail. This structure gives them significant advantages over traditional slide guides:
High Positioning Accuracy: With a friction coefficient of only 1/50 that of sliding guides, the difference between dynamic and static friction is minimal, eliminating stick-slip and enabling micron-level positioning accuracy.
Four-Directional Load Capacity: The 45° contact angle design of the ball grooves allows the guideway to bear loads in all four directions—radial, reverse radial, and two lateral directions—making it adaptable to complex load conditions.
Low Friction and Long Life: Friction resistance is only 1/20 to 1/40 of conventional slide systems. The design also incorporates a lubrication port on the carriage, simplifying maintenance and ensuring long-term accuracy retention.
Interchangeability and Easy Installation: Through strict manufacturing control, PMI carriages and rails within the same series are interchangeable. This allows replacement of individual components without complex scraping processes, significantly simplifying maintenance.
Main Product Series
PMI offers 6 major series of linear guideways to meet different application requirements:
Series Characteristics Typical Applications
MSA Series High-profile, heavy-load, full-ball type, high rigidity and precision Machine centers, CNC lathes, heavy cutting machine tools
MSB Series Low-profile, compact type, space-saving design for limited installation space Industrial robots, automation equipment, precision XY tables
MSC Series Miniature full-ball type, ultra-compact, carriages sizes available from 7 to 15mm IC manufacturing, wafer transfer, PCB assembly equipment
MSR Series Full-roller heavy-load type, roller elements provide higher rigidity Heavy-load applications requiring maximum rigidity
SME Series Ball chain type with retainer, chain design prevents ball loss and reduces noise High-speed, low-noise applications
SMR Series Roller chain type, combines roller rigidity with ball chain smoothness Ultra-heavy-load, high-rigidity applications
Precision Grades and Preload
PMI guideways are available in five precision grades: N (Normal), H (High), P (Precision), SP (Super Precision), and UP (Ultra Precision). For preload, users can choose from FC (light), F0 (medium), or F1 (heavy) to achieve optimal system rigidity and accuracy.
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For More information:Linear guideways | PMI linear guide rail pair | PMI linear guide
Application Scope
PMI linear guideways are found across diverse industries. The MSB series, for instance, is suited for CNC lathes, grinding machines, EDM equipment, and high-speed material handling devices, while the MSA series is often specified for heavy cutting machine tools and precision measuring instruments. The modular design also enables easy integration with ball screws and linear modules for complete motion control solutions.
