Which robot is better for this application?

FANUC CR-4iA is the stronger starting point for 4 kg collaborative-platform handling within the documented 550 mm working reference, while UFACTORY xArm 5 is worth shortlisting for three-kilogram development or handling tasks whose complete tool path needs only five arm axes. The final choice depends on the real loaded path, required protection, controls and acceptance results. Neither a higher payload nor a longer reach establishes a universal winner.

What payload should I use for the comparison?

Use 4 kg for the specified FANUC CR-4iA example and 3 kg for UFACTORY xArm 5, subject to all documented load and orientation conditions. Include the tool, adapters, sensors and carried part. Five axes do not provide arbitrary six-axis wrist orientation; demonstrate every approach and retreat before selecting the platform.

Does the stated reach guarantee access to my fixture?

No. The comparison gives 550 mm for FANUC CR-4iA and 700 mm for UFACTORY xArm 5 using the stated model references. Joint limits, reach reference points, wrist orientation, tool length and collisions determine whether the actual fixture is accessible. Simulate the full approach and exit path.

Can I use the best specifications from every family variant?

No. Keep each named model and revision intact. A different arm length, controller generation or protection option can change the relevant specification. Do not combine one version’s maximum payload with another version’s maximum reach.

Is repeatability the same as finished-part accuracy?

No. The stated values are ±0.01 mm for FANUC CR-4iA scope and ±0.1 mm for the competitor scope. Finished-part results also depend on fixtures, TCP calibration, sensing, thermal conditions and tool compliance. Validate the actual process instead of treating catalogue repeatability as a complete accuracy guarantee.

How should purchase prices be compared?

Use current written quotations for FANUC CR-4iA and UFACTORY xArm 5 with the same arm, controller, software, tooling and commissioning scope. This comparison does not represent an ATC sales offer or stock confirmation. Historical review figures are not a substitute for a configuration-specific purchase quotation.

Can these robots operate safely next to people without guarding?

These specifications do not establish a safe unguarded installation. Assess the complete task, tool, load and machine interface, then implement and validate the required safeguarding and operating procedures. Do not infer collaborative operation from a compact arm, limited payload or education setting.

What should an acceptance test compare?

Use the same parts, actual tool load, fixture locations, path and quality criteria for FANUC CR-4iA and UFACTORY xArm 5. Check production timing, settling, interruptions and recovery. Include the most difficult loaded approach and retreat. Approve the exact delivered configuration and preserve its final settings.