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High-Accuracy Motion Systems for Precision Measurement Instruments

C3 ground screws and SP-class guides for CMMs, optical vision measurers, laser interferometers and profilometers - stable, repeatable measurement accuracy.

Industry Context & Accuracy Requirements

Precision measurement instruments (CMM, optical vision measurer, laser interferometer, surface profiler, roundness tester, gear measuring centre) are the metrological benchmark of manufacturing; their accuracy decides product quality judgement. Demands are severe: positioning ±1µm to ±3µm (by range and class); repeatability ±0.5µm to ±1µm; straightness ≤ 0.002mm/1000mm; smooth motion (no stick-slip, no vibration, even low speed); temperature stability ≤ 1°C over long runs; and stable operation in a 20±0.5°C constant-temperature room.

High-Accuracy Motion System

For precision metrology, Shiyi Automation recommends:

C3 ground ball screws - SFAR series, lead accuracy ±0.008mm/300mm, preload P2 (heavy) to remove axial play; precision-ground with Ra ≤ 0.4µm surface finish to avoid stick-slip at low speed; small 2-5mm lead for higher resolution;
SP-class ultra-precision guides - TRH-V high-assembly square blocks, class SP (running parallelism ≤ 0.002mm), preload Z1 (medium); precision-ground rails with machined mounting datum;
Rigid fixed-side supports - BK units with matched angular-contact bearings (back-to-back) for high axial rigidity at speed; BF supported side allows thermal expansion;
Zero-backlash rigid couplings - flex-disc type with high torsional stiffness, dynamically balanced for high-speed running;
Dedicated lubrication - low-viscosity precision grease for stable lubricating film at low speed, with optional automatic lubrication systems.

Accuracy Assurance & Inspection

Lead accuracy inspection with a report for every screw before shipment; rail parallelism guidance (≤ 0.002mm/1000mm); system accuracy verification with laser interferometer support and compensation advice; and thermal-field analysis to optimise lubrication and cooling for temperature stability.

Typical Application

A Dongguan metrology OEM built a fully automatic optical vision measurer with 300mm X-axis requiring ±2µm positioning, ±1µm repeatability, 200mm/s measuring speed and no stick-slip; their C5 screw with standard guides showed stick-slip at 5mm/s and ±4-6µm fluctuation. Switching to MOSIONX: C3 SFAR1205 (5mm lead, preload P2) + TRH12 (class SP, preload Z1) + BK10/BF10 + flex-disc coupling + precision grease. Measured: positioning ±1.5µm, repeatability ±0.8µm, no stick-slip at 1mm/s, ≤ 0.8°C over 8 hours, and measurement repeatability improved from 3µm to 1.2µm.

Service

Dedicated support team - motion system design, accuracy budget and verification, installation and commissioning, compensation planning, lubrication schedules and fast spares. Original-quality assurance with traceable batches.

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