Nachi MR35 vs Yaskawa Motoman GP88: Robot Comparison
IN A NUTSHELL
🔎 THE KEY DIFFERENCE The GP88 is substantially heavier-duty than the MR35: 88 kg nominal payload versus 35 kg, with 2,236 mm versus 2,050 mm reach. They overlap only for tasks within the MR35 load limit. In that overlap, the MR35 extra axis may solve an access problem; outside it, the comparison is about changing the tooling or choosing the larger load class. |
→ CONSIDER Nachi MR35 Shortlist Nachi MR35 when its 35 kg selected load allowance and 2,050 mm stated reach fit the complete tool and part. Check the required approach path and the exact MR35, 35 kg floor-mounted reference configuration before treating it as a match. |
→ CONSIDER Yaskawa Motoman GP88 Shortlist Yaskawa Motoman GP88 when its 88 kg selected load allowance, 2,236 mm reach and 6-axis mechanism address your actual installation constraints. Include the tool mass; the headline capacity is not the part weight alone. |
💡 THE TAKEAWAY Choose the arm that completes the loaded task with workable access, repeatable recovery and support you can use. Ask both suppliers to demonstrate the same process and quote the same complete cell. |
Nachi MR35 vs Yaskawa Motoman GP88 is a decision about a complete machine-tending or handling installation. The GP88 is substantially heavier-duty than the MR35: 88 kg nominal payload versus 35 kg, with 2,236 mm versus 2,050 mm reach. They overlap only for tasks within the MR35 load limit. In that overlap, the MR35 extra axis may solve an access problem; outside it, the comparison is about changing the tooling or choosing the larger load class.
Quick verdict and the useful overlap
Do not justify the GP88 solely by unused capacity. A larger load allowance is valuable when the future tool, part mix or dual-gripper arrangement actually requires it. If every normal load remains below 35 kg, evaluate whether the MR35 redundant posture reduces layout changes enough to matter. Neither robot receives a cycle-time advantage from its headline rating.
The GP88 review identifies a 630 kg arm, YRC1000 control and floor, wall, ceiling or tilted installations. Its ±0.03 mm repeatability is tighter on paper than the MR35 value, but fixture error and tool deflection still enter the process. Compare foundation, service access and stopping behavior with the actual carried load.
Specifications and exact configuration scope
Criterion | Nachi MR35 | Yaskawa Motoman GP88 |
Selected configuration | MR35, 35 kg floor-mounted reference | GP88 |
Payload used here | 35 kg | 88 kg |
Stated reach | 2050 mm | 2236 mm |
Robot axes | 7 | 6 |
Published repeatability | ±0.07 mm | ±0.03 mm |
Control package | Matched Nachi control package | YRC1000 |
Price basis | Configuration-specific quotation | Configuration-specific quotation |
The table identifies a single comparison scope for each robot. It does not combine a family maximum payload with another variant’s reach. Reach values are starting references, not promises that every position inside a radius is accessible with every tool orientation. Maximum loads remain subject to the manufacturer’s moment, inertia, mounting and motion conditions.
Payload: count everything that moves
For Nachi MR35, the selected headline allowance is 35 kg; for Yaskawa Motoman GP88, it is 88 kg. Build the load calculation from the gripper, adapter, tool changer, sensors, carried services and the heaviest normal part. A dual gripper may carry an incoming and an outgoing part during the same exchange, so the worst case can occur between stations rather than during machining.
Mass is only one part of the load check. A long adapter moves the centre of gravity away from the flange and increases wrist moments. A broad part may create high rotational inertia even when its mass looks comfortable. Obtain the permitted load diagrams and run the actual centre-of-gravity and inertia values through the supplier’s sizing process. A percentage of unused payload is not a substitute for that check.
Reach and access: model the whole path
The selected reach references are 2,050 mm for Nachi MR35 and 2,236 mm for Yaskawa Motoman GP88. Position the base in the same cell model and test pickup, approach, insertion, withdrawal and transfer. Check wrist orientation at each point. A robot that reaches a coordinate with an empty flange may fail once a gripper, long part or cable loop is included.
For machine tending, model the door, chuck, jaws, tailstock and any adjacent fixture. The required movement is a path through these objects, not a straight line between two reachable poses. Include clearance for manual service with the robot parked. If the proposal needs a pedestal, rail or moving fixture, include its space, loading, calibration and safety responsibilities in the comparison instead of treating the robot as the entire system.
Axis count and predictable posture
The MR35 has seven axes while Yaskawa Motoman GP88 has six. The additional axis can provide alternative arm postures while retaining a tool pose, which is useful around obstructions. It does not automatically add process speed, payload or accuracy. A conventional six-axis solution can be entirely adequate when its path is clear.
Require a deliberate posture strategy at machine entry, handoff and withdrawal. Pay particular attention to restarting after a stop: recovery should not choose an unexpected route around a fixture or force an operator to improvise inside the cell. Retain the validated joint positions and configuration choices with the program, and test the recovery cases with representative tooling.
Repeatability and process quality
The reviews provide published repeatability figures for both selected robots. These describe return to a taught position under specified conditions; they do not describe absolute positioning accuracy, path accuracy or the accuracy of the completed part.
For assembly, separate robot positioning from fixture tolerances, part variation and tool compliance. For inspection, include camera calibration, illumination, sensor mounting and thermal effects. For machining-related handling, test the gripper’s ability to reseat a part consistently. A smaller robot repeatability number can be useful, but it cannot repair an unstable fixture or an unreliable grasp.
Controllers, software and machine integration
The control references in this comparison are Matched Nachi control package for Nachi MR35 and YRC1000 for Yaskawa Motoman GP88. Specify the delivered controller revision, pendant, software options, supported fieldbus and machine handshake. Do not infer that a port or protocol advertised for a controller family is included and licensed on the quoted unit.
Define robot-ready, machine-ready, cycle-start, clamp-confirmed, door state, fault and reset signals before commissioning. Separate normal process I/O from safety functions. Ask who supplies and maintains the robot program, PLC logic, machine interface and backups. A working demonstration is incomplete if the production team cannot restore it after a controller replacement or diagnose a stopped exchange without the original programmer.
Industries and functionality
The useful overlap for Nachi MR35 vs Yaskawa Motoman GP88 is industrial part handling and machine tending within both selected load-and-envelope limits. Potential projects include metal-part transfers, component loading and assembly support. Those are application possibilities, not claims that either model has been validated for your specific part, production environment or industry qualification.
For a wet machine tool, define coolant exposure, chip ingress, connector placement and gripper protection. For assembly, define insertion forces and how the cell detects a bad part. For packaging or transfers, define part presentation, accumulation and recovery from an empty pickup. The right arm is the one that supports the complete process with a feasible tool and layout, rather than the one with the longest list of possible applications.
Safety and the operating concept
Treat the robot, tooling, carried workpiece and surrounding machine as one integrated system. Determine the intended operating modes, access points, stopping behavior and recovery procedure. Neither a seventh axis, a touchscreen nor a small footprint establishes that a particular application can operate safely beside people.
The integrator must assess the actual hazards and provide the required protective measures for the cell. Include tool retention, sharp or hot parts, trapping points, unexpected machine motion and maintenance access. Where safety options are offered, identify the exact licensed functions and validate their use in the delivered application. Do not substitute a component certificate for a validated cell.
Cycle time and acceptance
Run the same representative process on both proposals. Use the real load, approach angles, grip confirmation, machine waits and required part quality. Include the slowest normal part variant and the changeovers the operators will actually perform. Maximum joint speed or composite speed does not establish good parts per hour.
Agree pass/fail conditions before the test: successful exchanges, part quality, recoverable interruptions and the production interval over which performance is measured. Test a missing part, a failed grip, a machine fault and a stopped cycle near the fixture. Record the hardware, software and settings used so later maintenance can restore the accepted behavior rather than merely a program with the same filename.
Price, ownership and service
Request current quotations for the exact selected configurations. Compare robot, controller, software, tooling, guarding, fixtures, machine interface, installation, commissioning, training and support as separate line items. Historical starting prices in an individual review are not a current complete-cell quotation, so this comparison does not use them to declare a price winner.
Include the cost of changeover, operator intervention, preventive maintenance, spare parts and fault recovery. Confirm local support for the delivered generation and who owns the program backups. An existing controller platform may reduce training effort, while a different arm geometry may reduce mechanical redesign. Quantify those project-specific effects before deciding which proposal has better value.
Final selection
The GP88 is substantially heavier-duty than the MR35: 88 kg nominal payload versus 35 kg, with 2,236 mm versus 2,050 mm reach. They overlap only for tasks within the MR35 load limit. In that overlap, the MR35 extra axis may solve an access problem; outside it, the comparison is about changing the tooling or choosing the larger load class.
Do not justify the GP88 solely by unused capacity. A larger load allowance is valuable when the future tool, part mix or dual-gripper arrangement actually requires it. If every normal load remains below 35 kg, evaluate whether the MR35 redundant posture reduces layout changes enough to matter. Neither robot receives a cycle-time advantage from its headline rating.
Frequently Asked Questions
What is the main difference between Nachi MR35 and Yaskawa Motoman GP88?
The GP88 is substantially heavier-duty than the MR35: 88 kg nominal payload versus 35 kg, with 2,236 mm versus 2,050 mm reach. They overlap only for tasks within the MR35 load limit. In that overlap, the MR35 extra axis may solve an access problem; outside it, the comparison is about changing the tooling or choosing the larger load class.
Which robot has the more suitable payload for my tool?
Compare the complete carried load against 35 kg for Nachi MR35 and 88 kg for Yaskawa Motoman GP88, using the selected scopes in the table. Include the tool and any second part, then check centre of gravity and wrist inertia. A mass-only pass does not establish an acceptable operating condition.
Does the longer stated reach guarantee better machine access?
No. The stated references are 2,050 mm and 2,236 mm, but access depends on base position, joint limits, approach angle, tooling and surrounding machinery. Test the complete loaded path and the parked position in the same layout.
Does the seventh axis make the MR35 automatically better?
No. Redundancy is useful when an alternative arm posture solves a concrete access or clearance problem. It also requires controlled posture and recovery behavior. A six-axis arm can be the appropriate choice when it completes the required path without those additional posture options.
Can either robot work beside people without a protected cell?
That cannot be decided from payload, axis count or programming interface. Assess the complete application, including tooling, workpieces and the connected machine, and validate the protective measures and operating modes selected by the integrator.
Which robot is faster in production?
The cited headline specifications do not establish a production winner. Compare the same loaded path, machine waits, gripping checks, settling requirements and recovery cases. Measure accepted output over representative operation, rather than using an unloaded motion demonstration.
How should I compare purchase prices?
Obtain current, configuration-specific quotations with the same scope: arm, controller, software, tooling, safety equipment, fixtures, installation, training and service. Separate optional systems and recurring costs. Do not compare a bare-arm price with a commissioned production cell.
What should the acceptance test prove?
Do not justify the GP88 solely by unused capacity. A larger load allowance is valuable when the future tool, part mix or dual-gripper arrangement actually requires it. If every normal load remains below 35 kg, evaluate whether the MR35 redundant posture reduces layout changes enough to matter. Neither robot receives a cycle-time advantage from its headline rating. Then test loaded motion, required quality, machine handshakes, interruption recovery and access for maintenance. Keep the accepted configuration and backups with the commissioning records.
Read the individual product reviews
Specifications, options and support depend on the supplied model, revision and region. Confirm the exact load diagram, controller package, commercial terms and acceptance obligations with the supplier.
