M-20/35-18D Six-axis robotic arm (manipulator)
35kg / 1831mm working radius
Specifications of the M-20/35-18D
M-20 Series · Series technical features
Proprietary gear drive mechanism for highly stable joint movement
Typical application scenarios
Common application processes for this model (click to view process details):
M-20 Series · Other models in the same series
Compare load and reach to choose the model that best suits your process.
M-20/35-18D model positioning and working condition adaptation
M-20/35-18D It belongs to the FANUC M-20 series industrial robot model, with a rated load of 35kg, a motion radius of 1831mm, and a repeatability of ±0.03mm. FANUC's technology is renowned for its high reliability, leading the MTBF industry, and ranking first globally in installed capacity; The control platform is the R-50iA (A, B, C cabinets) and R-50iA Mate, with a program ecosystem of TP teach pendant + KAREL/PASCAL programs.
From the perspective of working condition adaptation, typical applications for medium-duty load (35kg) positioning are:Welding, machine tool wiring, medium-sized palletizing, and die-casting part removalCommon application processes for this model include handling, spot welding, arc welding, and machining. The long reach (1831mm) covers multiple stations and large pallets, reducing robot movement or coordination with ground track expansion. ± 0.03mm repeatability is the standard level for six-axis industrial robots, covering most working conditions such as welding, handling, palletizing, and loading/unloading. This level is the main stage for welding and loading; when selecting a positioner or dual stations, pay attention to the total cycle time and interference zone planning.
| Parameters | Engineering interpretation and usage recommendations |
|---|---|
| Rated load: 35kg | It is recommended to reserve a load margin of 20%–30%; Verification is made by combining end self-weight + workpiece + imbalanced load inertia, especially sensitive to high-speed conditions |
| Radius of motion: 1831mm | Determine the radius of the workcell layout: bins, tooling, and fences are bounded by maximum arm span + safety distance; Verify the accessibility of each pick-and-place point during cross-station service |
| Repeatability: ±0.03mm | Repeatability ≠ absolute accuracy: Precision assembly requires external measurement closed-loop or visual guidance; Long-term accuracy trends rely on annual retest management |
| Controller: R-50iA (A, B, C Cabinets) R-50iA Mate | Decide on the process ecosystem, spare parts channels, and second-hand residual value; Currently, spare parts channels are smooth, and repair and upgrade paths are mature |
Control systems and common failure modes
The R-50iA (A, B, C cabinets) and R-50iA Mate controller are paired with the M-20/35-18D, with a programming language and development environment of TP teach pendant + KAREL/PASCAL programming. Maintenance of this generation of control platforms focuses on three basic components: power, storage, and cooling—most "sudden downtime" can be detected in advance when preventive maintenance is in place.
| Failure mode | Typical performance | Disposal recommendations |
|---|---|---|
| SRAM battery voltage low alarm | SRAM battery voltage low alarm (3V lithium battery depleted, risk of loss of program and zero data) | Included as a mandatory inspection item for annual maintenance, with spare parts stocked in advance |
| Driver fuses blow and power supply unit aging | Driver fuse blowing and power unit aging (AX shaft alarm) | Initial interpretation of alarm codes by reference with manuals, remote diagnosis allows for early positioning |
| The teach pendant cable is broken and the touch screen is malfunctioning | Teach pendant cable core broken and touch screen failure (high-frequency bending areas) | Daily inspection coverage, with abnormal trends (abnormal noises/temperature rise/errors) recorded |
| Wear of fan unit bearings causes control cabinet overheating alarms | Wear of fan unit bearings causes control cabinet overheating alarms | Quarterly dust removal maintenance and cabinet temperature monitoring |
| Maintenance projects | Cycle recommendations | Key points |
|---|---|---|
| Replace the battery every 1–2 years while powered (replacing the battery after power loss will result in zero point and programming). | Every 1–2 years | Replace the battery every 1–2 years while powered (replacing the battery after power loss will result in zero point and programming). |
| Fan units are replaced as a whole set every 3–5 years | Quarterly | Fan units are replaced in full groups every 3–5 years, and the internal cabinet filters are cleaned quarterly |
| Reducers should be lubricated according to operating hours (RV and harmonic areas have different grease grades). | By operating hours | Reducer grease according to operating hours (RV and harmonic grease grades differ, do not mix) |
| Cable and drag chain inspection | every six months | Insulation, shielding, and bending radius inspection of power and encoder lines, as well as wear of cables inside the drag chain, are the main causes of intermittent faults |
| Zero point and accuracy retest | Every year | Repeatability measured by dial gauges or laser trackers, drift trend digitization—accuracy degradation can be seen six months in advance |
| Control cabinet dust removal and fans | Every quarter | Filter cleaning, fan speed and noise checks, cabinet temperature recording; Dust environments shorten the cycle |
Henghuan's service capabilities for M-20/35-18D
This site is a third-party robotics technology service provider. The eight major business supports related to the M-20/35-18D are as follows (sorted by service frequency for each model):
- Maintenance and repair: On-site diagnostics, board-level maintenance, and annual maintenance contracts for M-20/35-18D—battery replacement every 1–2 years while powered (battery replacement after power outage will result in zero points and procedures), etc. We follow SOPs and respond to Sichuan-Chongqing on the same day.
- Used & in-stock robot sales: The second-hand market has the largest circulation and highest residual value. R-30iA/B generation spare parts are sufficient, making it a reliable choice for used robot purchases; In-stock models M-20/35-18D or equivalent come with a full-function test report and a 12-month warranty.
- Sales of new industrial robots: When adding new production lines or replacing entire batches, we conduct cross-brand selection comparisons based on process requirements (including models of the same class as FANUC), and provide configuration and pricing plans.
- Applied technology services: Process programming, trajectory optimization, tap time potential, and model change formula management for M-20/35-18D, with targeted commissioning according to handling, spot welding, arc welding, and machining conditions.
- Research and development of automation equipment: Custom fixture ends, peripheral tooling, and safety fences for M-20/35-18D, with interfaces designed according to FANUCO flange and IO standards.
- Robot rental: For short-term capacity or process validation periods, M-20/35-18D models of the same class in inventory can be rented, including transportation, installation, and commissioning, with flexible rental periods and can be repurchased.
Common issues with this device
Is it easy to find spare parts for the M-20/35-18D?
FANUC has smooth spare parts channels for this generation, with regular parts such as drivers, power modules, batteries, and teach pendant components available in stock or short-cycle channels; Replace consumables that are powered on every 1–2 years (replacing batteries after power outage will cause zero points and program loss) is recommended to be included in the annual maintenance contract.
With a nominal load of 35kg, how much can it actually handle?
The rated load is the static load limit of the flange surface. In actual selection, three factors must be considered: the self-weight of the end fixture (vacuum suction cup groups or grippers often account for 2–5kg), the inertia generated by the workpiece offload (checked according to the inertia ratio when the center of gravity deviates from the flange center), and the dynamic load during high-speed movement. The conventional engineering practice is to keep the "end + workpiece" within 70%–80% of the rated value to ensure cycle time and service life.
If the equipment's accuracy deteriorates after several years of use, how can it be restored?
According to the inspection order: first check whether the zero point is drifting (common after collision or battery depletion), then perform zero calibration; Check the reducer's return error (actual measurement of forward and reverse positioning deviation; if exceeded, disassemble or replace); Then check the installation base fastening and foundation settlement; Finally, trajectory compensation parameter restructuring. Most accuracy issues can be mostly restored after calibration and maintenance, so there is no need to rush into major repairs—we first release the inspection data before deciding on the plan.
Is the used M-20/35-18D worth buying?
The second-hand market has the largest circulation and highest residual value, with ample spare parts for the R-30iA/B generation, making it a reliable choice for used robot procurement. Three essential items for second-hand procurement: comprehensive inspection reports (axial accuracy, driver status, insulation and battery), maintenance history and operating hours, controller generation, and software license integrity. Every used machine we sell comes with inspection records and a 12-month warranty, and we can also accept third-party inspections designated by customers.
Need technical support or procurement for this model?
Whether it's model selection comparison, installation and commissioning, or maintenance of in-use equipment, you can contact Henghuan. Tell us about your processes, loads, and equipment status, and we will provide third-party technical support and solution recommendations.
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