How to Choose Cross Rollers for Global Sourcing?

Sourcing Stage	Evaluation Dimension	Recommended Requirement	Sample Confirmation Data	Customization Scope	Inspection Method	Delivery and Commercial Terms
1. Application Definition	Load and motion profile	Specify radial load, axial load, moment load, stroke, speed, duty cycle, and expected service life before requesting quotations.	Example: 2,000 N radial load; 500 N axial load; 100 mm stroke; 60 cycles/min; minimum L10 life of 10,000 km.	Preload, clearance, mounting orientation, lubrication type, and sealing arrangement can be matched to the application.	Review load calculations and verify operating conditions against the bearing load rating and manufacturer calculation sheet.	Request a technical quotation with assumptions, exclusions, service-life calculation, and validity period.
2. Product Selection	Size and dimensional compatibility	Confirm shaft or table dimensions, mounting-hole pattern, overall height, effective stroke, and available installation space.	Example sample: 80 mm nominal rail length; 60 mm carriage length; 30 mm width; 12 mm height; 50 mm effective stroke.	Non-standard lengths, carriage configurations, mounting holes, end seals, and rail-to-carriage combinations may be requested.	Measure with calibrated vernier calipers, micrometers, height gauges, and a coordinate measuring machine where required.	Require a controlled drawing with revision number, tolerance table, material, heat-treatment condition, and inspection datum.
3. Sample Approval	Sample quantity and traceability	Order at least three samples from the intended production route when repeatability and preload consistency are important.	Each sample should carry a lot number, production date, dimensional report, material certificate, and lubrication record.	Sample drawings and production drawings must use the same revision-controlled specifications before approval.	Check dimensions, smooth travel, abnormal noise, starting torque, preload, and visual condition against an approved sample report.	Define sample approval as a purchase milestone; mass production should not begin before written approval.
4. Accuracy and Preload	Running accuracy and internal preload	Select an accuracy class and preload grade suitable for the machine stiffness, positioning accuracy, and operating speed.	Typical precision applications may require running parallelism in the tens of micrometres per metre and controlled preload variation.	Specify light, medium, or heavy preload only after checking friction, heat generation, rigidity, and drive capacity.	Use a force gauge or torque measurement system for preload and a dial indicator or laser measurement system for running accuracy.	The purchase order should state the accuracy class, preload grade, measurement direction, measuring speed, and acceptance limits.
5. Materials and Manufacturing	Rail, roller, and retainer quality	Confirm bearing steel grade, hardness range, heat treatment, roller geometry, retainer material, and surface protection.	Typical bearing-steel components are through-hardened or case-hardened according to the design; the exact grade must be stated on the drawing or certificate.	Options may include corrosion-resistant steel, special coatings, high-temperature grease, or clean-environment materials.	Review mill certificates, hardness test records, surface-finish readings, and heat-treatment traceability.	Require change notification for material, heat treatment, production location, tooling, lubricant, or subcontracting changes.
6. Lubrication and Environment	Operating environment	Define temperature, dust, moisture, vacuum, cleanroom class, corrosion exposure, and relubrication interval.	Example requirement: operating range of 10–40 °C, standard industrial atmosphere, protected from direct coolant and abrasive dust.	Grease type, filling quantity, seals, wipers, stainless components, and cleanroom cleaning can be customized when technically feasible.	Verify lubricant identification, fill quantity, seal contact, contamination level, and travel noise during a functional test.	Require safety data sheets and storage instructions; specify shelf-life, packaging humidity protection, and first-use date limits.
7. Inspection Planning	Pre-shipment quality control	Use a written inspection plan covering critical dimensions, appearance, preload, smoothness, noise, packaging, and documentation.	Suggested sampling: 100% inspection for critical dimensions and function; statistical sampling for non-critical cosmetic items.	Agree on critical-to-quality characteristics, inspection equipment, sampling level, and nonconformance disposition before production.	Use calibrated equipment with valid certificates and retain inspection records linked to the shipment lot.	Payment balance may be linked to an accepted inspection report, subject to the agreed purchase contract.
8. Packaging	Protection during international transport	Prevent corrosion, impact, contamination, and rail deformation during handling and long-distance transport.	Each unit should be sealed or protected with suitable rust-prevention material, immobilized, labelled, and packed with shock protection.	Export cartons, reusable cases, moisture indicators, desiccant, barcode labels, and custom pallet dimensions may be specified.	Perform packaging inspection, carton-weight verification, label review, and, for sensitive shipments, vibration or drop-risk assessment.	State carton dimensions, gross weight, pallet requirements, marking language, and wood-packaging compliance requirements.
9. Delivery Terms	Lead time and Incoterms	Separate sample lead time, production lead time, inspection time, and transit time in the quotation.	Illustrative planning target: samples in 2–4 weeks; standard production in 4–8 weeks after drawing approval and deposit.	Custom tooling, special materials, or low-volume production may add engineering and manufacturing time.	Track production milestones, inspection release, booking confirmation, commercial invoice, packing list, and transport documents.	Compare FCA, FOB, CPT, CIP, or DAP under Incoterms® 2020; clearly define exporter, importer, insurance, and customs responsibilities.
10. Final Supplier Decision	Total landed cost and risk	Evaluate unit price together with tooling, inspection, freight, duties, warranty, replacement cost, and delivery reliability.	Approve only samples that meet dimensional, functional, documentation, and packaging requirements without unresolved deviations.	Document all approved deviations, engineering changes, minimum order quantities, and future volume-price conditions.	Use a weighted scorecard: technical compliance 35%, quality system 20%, delivery 20%, total cost 15%, communication 10%.	Sign a quality agreement covering warranty period, replacement procedure, corrective-action response time, records, and audit rights.