Which robot is better for this application?

Epson GX8-B451 is the stronger starting point for 8 kg maximum-load SCARA handling within the selected 450 mm horizontal envelope, while Mitsubishi Electric RH-6FH is worth shortlisting for 6 kg planar handling within the selected 350 mm SCARA envelope. 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 8 kg for the specified Epson GX8-B451 example and 6 kg for Mitsubishi Electric RH-6FH3520-D, subject to all documented load and orientation conditions. Include the tool, adapters, sensors and carried part. Four axes do not provide arbitrary wrist pitch and roll.

Does the stated reach guarantee access to my fixture?

No. The comparison gives 450 mm for Epson GX8-B451 and 350 mm for Mitsubishi Electric RH-6FH 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 ±0.015 mm for Epson GX8-B451 scope and ±0.01 mm (XY) 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 Epson GX8-B451 and Mitsubishi Electric RH-6FH 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 Epson GX8-B451 and Mitsubishi Electric RH-6FH. 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.