Company Profile: Precision Motion Industries, Inc. (PMI)
Precision Motion Industries, Inc. (PMI) is a Taiwanese manufacturer specialising in high precision linear motion products for industrial machinery and automation. The company manufactures a comprehensive range of linear guideways, ball screws and other precision motion components designed for applications requiring accuracy, rigidity and reliable long-term performance.
PMI combines precision manufacturing with extensive quality control throughout its production processes. Its ball screw manufacturing, for example, covers the complete production sequence from material preparation and machining through heat treatment, grinding, assembly and final inspection. PMI operates an ISO 9001 certified quality management system, supporting consistent manufacturing standards across its precision motion product ranges.
Kiwi Motion is a UK distributor and partner for PMI, holding PMI linear guides in stock in the UK and providing local engineering and machining services to support OEMs, machine builders and automation specialists.
Precision Linear Guideway Technology
PMI is particularly well known for its precision linear guideways, with a wide range of rail and carriage configurations available to suit different load, accuracy, space and rigidity requirements.
PMI linear guides use recirculating rolling elements to provide accurate linear movement with low friction. Depending on the series, designs are available with four-way equal load capability, high rigidity and preload options, allowing loads to be supported in radial, reverse radial and lateral directions.
The PMI linear guide range includes compact, standard, heavy-duty, wide and roller guideway designs, providing solutions for everything from compact automation equipment through to heavily loaded machine tools and production machinery.
Interchangeable rail and carriage options are also available across selected PMI ranges. Closely controlled dimensional tolerances allow compatible rails and carriages of the same specification to be matched, simplifying machine assembly, maintenance and replacement.
High Precision Ball Screws
Alongside linear guideways, PMI manufactures an extensive range of ball screws for precision positioning and power transmission applications.
PMI ball screws are designed to provide high mechanical efficiency, accuracy and rigidity while minimising backlash. Ground ball screws are manufactured and inspected in a temperature-controlled environment, with PMI specifying a controlled temperature of 20°C during machining, grinding, assembly and quality inspection.
A Gothic arch groove profile provides effective contact between the balls and raceways, while preload can be applied to eliminate axial clearance and increase system rigidity. This makes PMI ball screws suitable for applications requiring accurate and repeatable positioning under demanding operating conditions.
PMI’s wider precision motion portfolio also includes products such as ball screw splines and cross roller bearings, providing machine designers with complementary components for complex linear and rotary motion systems.
Applications Across Advanced Machinery
PMI linear motion products are used across a broad range of industrial and precision engineering applications, including CNC machine tools, industrial automation, robotics, semiconductor and electronics manufacturing, measuring equipment and automated production machinery.
Linear guideways provide the accurate, low-friction movement required by machine axes and automated handling systems, while ball screws efficiently convert rotary motion into precise linear movement. Together, these technologies form critical components within modern machinery where positioning accuracy, repeatability and rigidity are essential.
PMI also develops specialist motion products for more complex applications. Its precision ball screw spline technology, for example, combines ball screw and ball spline functions on a single shaft to provide linear, rotary and spiral motion, with applications including SCARA robots, assembly robots, automatic loaders and machining centre tool-changing equipment.
Quality and Precision Manufacturing
Quality control forms an integral part of PMI’s manufacturing process. Ball screws pass through controlled production stages including machining, heat treatment, grinding, assembly and inspection, helping maintain consistent accuracy and reliability.
High precision ground ball screws are individually inspected, with PMI providing inspection certification for accuracy grades C5 and above. Materials and heat treatment processes are carefully controlled to provide the surface hardness, rigidity and durability required for demanding industrial applications.
This combination of precision manufacturing, controlled inspection and specialist linear motion engineering has established PMI as a recognised Taiwanese manufacturer of motion components for machine builders and automation equipment manufacturers worldwide.
PMI Linear Guides from Kiwi Motion
As a UK distributor and partner for PMI, Kiwi Motion provides local access to PMI linear guideways and associated motion products, backed by UK stock and engineering support.
We hold a range of PMI linear rails and carriages in stock in the UK, allowing us to provide significantly shorter lead times than sourcing rails specifically for each application. Linear rail can be precision cut to the customer’s required length in-house, enabling machine builders to order the rail lengths they actually require rather than being restricted to standard factory lengths.
Our in-house cutting and machining capabilities also allow us to support custom requirements and machine builds, from individual replacement rails through to complete sets of linear guides for new machinery.
By combining PMI’s precision linear motion technology with UK stock, cut-to-length rail and local technical support, Kiwi Motion can provide a flexible linear guide solution for OEMs, machine builders, automation specialists and maintenance engineers throughout the UK.
