FANUC M-10iD/8L vs Nachi MR20: Robot Comparison

IN A NUTSHELL

FANUC M-10iD/8L vs Nachi MR20 is a choice about assembly and machine tending. FANUC M-10iD/8L and Nachi MR20 differ in their working envelope, loading assumptions and engineering ecosystem. A useful decision starts with the exact mechanism and process, then checks whether either robot can execute the required path with the real tool attached. This comparison separates documented specifications from application-level engineering judgments.

FANUC M-10iD/8L vs Nachi MR20: quick verdict

Shortlist FANUC M-10iD/8L for 8 kg industrial handling within the documented 2032 mm working reference. Shortlist Nachi MR20 for seven-axis posture flexibility with 20 kg nominal capacity. Neither is a universal winner: a robot that can carry the load may still fail the fixture-access, controller or maintenance requirements.

The numerical comparison below uses FANUC M-10iD/8L against Nachi MR20. The stated model scope matters when comparing later revisions or differently equipped installations. Published repeatability describes return to a taught position under specified conditions; it does not establish complete-cell accuracy or prove a faster production cycle.

Specifications and exact configuration scope

Read the reach row together with the geometric notes below. Manufacturers may specify an arm-link sum, a wrist-centre motion area or reach to the flange; those dimensions are not interchangeable. The table does not establish access to every point at every tool angle. Controller references identify reviewed packages, and actual compatibility must be confirmed by model, software version and region.

FANUC M-10iD/8L: design and configuration

The FANUC M-10iD/8L is the named 6-axis configuration with 8 kg payload, 2032 mm horizontal reach and ±0.03 mm repeatability in the reviewed model scope. Retain the full suffix: long-reach, short-arm and heavier-load versions have different wrist limits and working envelopes. For machine tending, assembly or heavy transfer, validate the actual fixture, tool centre of gravity, return path and base reactions rather than borrowing a family maximum. Maximum speed and published repeatability do not establish a loaded production cycle or complete-cell accuracy. The control baseline is R-30iB Plus package; verify cabinet and supplied generation; cabinet, industrial-network licences, safety options and process software must be named in the quotation.

Nachi MR20: design and configuration

Nachi MR20 is assessed as the named 7-axis configuration with 20 kg payload, 1260 mm reach and ±0.06 mm pose repeatability. The standard MR20 uses the 20 kg / 1260 mm reference. The separately advertised maximum of 30 kg is confined to a reduced operating envelope; it is not an unrestricted full-reach rating. The longer 1398 mm MR20L is a distinct configuration. Seven arm axes provide an additional posture degree of freedom, allowing the elbow to move around an obstacle while maintaining some tool poses where the joint limits permit. This can help machine tending in a confined cell, but it does not automatically increase wrist capacity, calibrated accuracy or productive speed. Validate the complete joint path, singularity handling, cable sweep and a recoverable posture after a stop. The manufacturer lists floor or inverted mounting, a 230 kg mass and IP65 protection in the selected reference. Inverted installation requires an approved support, lifting and maintenance plan; protection does not approve arbitrary coolant chemistry or washdown. Identify the matched Nachi controller revision, programming environment, machine handshake, safety functions and any force/vision options in the actual package. Include the gripper, adapter, retained part and hose forces in wrist moments and inertia. Check access to the back of a fixture and the loaded retreat as carefully as the nominal farthest point. Repeatability is repeated-pose performance, not a measured machining or insertion result. Compare guarded production access and operator recovery separately from the arm’s redundant kinematics. Confirm the offered generation, condition, service coverage and spare-part availability; catalogue presence does not establish current local stock.

For this pair, Nachi MR20 offers 20 kg over the stated 1260 mm reference, compared with 8 kg and 2032 mm for FANUC M-10iD/8L example. FANUC M-10iD/8L has the larger stated distance by 772 mm, but this difference is only a preliminary layout indicator because reference points and joint envelopes can differ. Locate the actual fixture in each manufacturer model before treating this as usable extra working space.

Payload, tooling and a worked load example

Consider an illustrative total wrist load of 6.4 kg: a 1.6 kg tool and adapter package carrying a 4.8 kg part or product group. This arithmetic leaves 1.6 kg below the FANUC M-10iD/8L example’s nominal limit and 13.6 kg below Nachi MR20’s nominal limit. These are mass differences, not safety factors or a validated load approval. A heavy camera, valve block or retained material must be included before recalculating the total.

The example exposes the practical question: is the application limited by mass, by tool offset or by wrist rotation? FANUC M-10iD/8L is the lower-or-equal nominal payload choice in this pair. Nachi MR20 offers more or equal headline mass capacity, but that alone cannot approve an eccentric fixture. Moving the same mass farther from the flange increases the moment, and spreading it increases rotational inertia. Manufacturer load diagrams and the actual centre of gravity govern the final allowable motion.

Model the empty, partly loaded and fully loaded tool states separately. A vacuum layer gripper, a weld torch with hoses or an inspection head may change its effective loading during the cycle. Set the controller’s load data for each supported state and validate the transition logic. A payload table cannot predict acceleration derating, cable pull or transient reactions at a machine interface.

Reach, orientation and fixture access

Build the same cell model for both candidates: base height, machine opening, fixture datum, maximum part size, tool extension and access for maintenance. FANUC M-10iD/8L provides a stated 2032 mm reference, while Nachi MR20 provides 1260 mm. Check the deepest production pose and the return path with the loaded tool. An arm that just touches the target at full extension may have little freedom left to turn, retract or avoid a door.

For assembly and machine tending, test the gripper jaws in their open and closed positions. Include feeder replenishment, rejected-part disposal and tool changes. Check wrist flips and singularity avoidance along the whole path. A compact robot can fit a small fixture well, while a longer arm can simplify station placement; neither geometric benefit can be assumed without the actual model.

Precision and throughput: compare the same task

The comparison uses ±0.03 mm for FANUC M-10iD/8L and ±0.06 mm for Nachi MR20. These figures should be read in their documented configuration scope. Repeatability is not absolute accuracy, camera calibration accuracy or finished-part capability. Fixture variation, TCP calibration, thermal conditions and tool compliance can dominate the error at the process point, especially when the tool extends far from the flange.

Ask each integrator to execute the same representative path with the same payload model, tool length, process dwell and stop conditions. Report transfer time, settling time, process time and waiting time separately. Published standard cycles often use different loads and distances; dividing one catalogue cycle by another would not establish the production advantage of FANUC M-10iD/8L over Nachi MR20. Use a measured or validated application cycle before assigning a throughput benefit.

Programming, controls and production integration

FANUC M-10iD/8L is paired here with R-30iB Plus package; verify cabinet and supplied generation, while Nachi MR20 uses Matched Nachi FD-generation controller; confirm cabinet and firmware. Controller names identify the review baseline rather than a guarantee that all interface options are included. Compare the actual software revision, teaching workflow, diagnostic tools, fieldbus licences and recovery procedures. An existing trained team and reusable production code may outweigh a small dimensional advantage. Obtain a demonstration of the same machine handshake and interrupted-cycle recovery on both platforms.

Specify the PLC handshakes before ordering: cycle request, ready, busy, complete, fault, part present and recovery authorization. Define how an interrupted operation resumes without repeating a dangerous or quality-critical action. Vision, force sensing, fieldbus communication and external-axis coordination must be checked as explicit included or optional functions. An Ethernet connector does not by itself prove that a particular industrial protocol or software interface is licensed and supported.

Configuration and communication detail

Protection, installation and maintenance

Match the precise protection package to the process. Standard, protected, cleanroom, foundry and washing configurations can have different seals, services and maintenance requirements. Do not transfer the best optional IP or cleanroom rating to an unprotected base model. Check the controller location, cable bend radius, available lifting access and base reactions with the installer.

Treat safe operation as a property of the complete task and installation. Include the tool, sharp workpiece edges, trapping points, dropped loads and machine access. These robot systems require task-specific safeguarding; payload or compact size does not establish safe unguarded operation. Plan tool replacement and fault recovery without dismantling the whole installation, and include connector access, lubrication and spare-cable replacement in the maintenance layout.

Price and lifecycle value

Arm prices: FANUC M-10iD/8L is listed from $42,000 and Nachi MR20 is estimated from $34,500. Request configuration-specific quotations for FANUC M-10iD/8L and Nachi MR20. An arm-only number is not the price of a commissioned production cell. Ask for separate line items for controller, pendant, communication options, end effector, safety equipment, installation, acceptance, training and warranty. Price changes, regional support and included software can reverse an apparent hardware-cost advantage. Compare the same delivered scope before calculating payback.

Compare the installed production scope: tool, fixtures, sensing, guarding, machine interface, programming, acceptance and training. For small-parts automation, include feeders, vision calibration, nests and rejected-part handling. Keep purchase cost and recurring support costs separate. No payback figure is defensible until the actual cycle, yield, utilization and installation quotation are known.

Selection and acceptance plan

Advance FANUC M-10iD/8L when 8 kg industrial handling within the documented 2032 mm working reference solves the real constraint and its selected configuration passes the load and access checks. Advance Nachi MR20 when seven-axis posture flexibility with 20 kg nominal capacity provides the more suitable process arrangement. Reject either candidate if a mandatory pose, protection requirement or controller function cannot be demonstrated. A purchasing shortlist should preserve these conditions instead of converting a single catalogue advantage into a blanket recommendation.

Before acceptance, agree the representative parts, tool states, operating sequence and quality criteria with both suppliers. Demonstrate cold start, normal production, rejected parts, interrupted cycles and controlled recovery. Record the final tool data and software backup. This turns the comparison into a repeatable purchasing decision and helps prevent a later fixture change from invalidating the original robot selection.

Motion architecture and functionality

FANUC M-10iD/8L has 6 arm axes and Nachi MR20 has 7 arm axes. A seven-axis arm has an additional posture degree of freedom: the elbow can move while preserving a tool pose where the joint limits permit. This can help around obstacles, but also requires cable and full-path validation. Compare tool detection, sensing, machine I/O and recovery as separate delivered functions.

Industries and application fit

For FANUC M-10iD/8L vs Nachi MR20, use the actual part and process as the industry filter. Electronics, manufactured-component handling and machine tending are candidate uses when their tool mass, access and quality requirements fit the documented configurations. These are application-selection judgments, not claims that either exact model is installed at a named customer. A food, medical-device or clean-production application additionally requires the correct material, lubrication and protection package; the base model name does not establish hygienic or cleanroom compliance.

Frequently asked questions

Which robot is better for this application?

FANUC M-10iD/8L is the stronger starting point for 8 kg industrial handling within the documented 2032 mm working reference, while Nachi MR20 is worth shortlisting for seven-axis posture flexibility with 20 kg nominal capacity. 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 FANUC M-10iD/8L example and 20 kg for Nachi MR20, subject to all documented load and orientation conditions. Include the tool, adapters, sensors and carried part. Confirm exact configuration, controller, wrist loading and installation envelope.

Does the stated reach guarantee access to my fixture?

No. The comparison gives 2032 mm for FANUC M-10iD/8L and 1260 mm for Nachi MR20 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 ±0.03 mm for FANUC M-10iD/8L scope and ±0.06 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 M-10iD/8L and Nachi MR20 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 M-10iD/8L and Nachi MR20. 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.

Related ATC reviews

Read the FANUC M-10iD/8L review

Read the Nachi MR20 review

Specifications describe the model scope identified above. Purchase pricing requires a current configuration-specific quotation. Confirm current manufacturer documentation, local supply, controller compatibility and the exact configuration before purchase.