SZGH-M1850-3C-6: 6-Axis Large-Reach Grinding & Polishing Robot

The SZGH-M1850-3C-6 is a six-axis industrial grinding and surface-finishing robot engineered for large-workpiece applications. With an industry-leading 1,850 mm reach in the M series, a 30 kg payload, ±0.08 mm repeatability, and a factory-integrated grinding process package — including force-controlled parameters and trajectory optimisation algorithms — it delivers consistent, automated deburring, polishing, and finishing across automotive panels, large castings, structural steel, and shipbuilding components.

Full Technical Specifications

Motion Range

Maximum Speed

Core Advantages

Longest Reach in the M Series — 1,850 mm

At 1,850 mm, the M1850-3C-6 covers the largest working envelope in the entire SZGH M series. For workpieces up to 1,400 mm × 900 mm — such as automotive door inners or engine-compartment lids — the robot completes a full grinding pass without repositioning the workpiece. That single fact eliminates fixture changeover downtime and the repeatability errors introduced by re-clamping.

Built-In Grinding Process Package (M Series Exclusive)

No other SZGH series includes a factory-tuned grinding process package. It encompasses:

• Force-controlled grinding parameters — automatically adjusts contact pressure as workpiece geometry changes, preventing dig-in on concave radii and insufficient material removal on convex flanges.

• Trajectory optimisation algorithms — pre-programmed path strategies for deburring, blending, polishing, and chamfering, reducing teach-in time from days to hours.

• Integration interfaces for grinding tooling — direct compatibility with pneumatic floating grinding wheels, abrasive belt machines, and polishing heads from major tooling brands.

3rd-Generation High-Rigidity Structure ("3C")

The 3C designation marks the third-generation compact high-rigidity joint design. At 1,850 mm reach, lesser robots amplify vibration at the tool tip. The M1850-3C-6's reinforced arm structure and high-stiffness joints minimise tool-tip deflection, holding ±0.08 mm repeatability even at full extension under sustained grinding loads.

High-Speed Wrist for Continuous Large-Area Finishing

Axes 4–6 reach 222°/sec. On large-panel polishing paths — where the wrist is constantly reorienting to maintain the correct tool angle to the surface — this speed prevents cycle-time bottlenecks that slower wrist axes create. The result is throughput comparable to multi-robot cells, from a single robot installation.

Flexible Mounting — Ground, Bracket, or Ceiling

All three mounting configurations are supported without mechanical modification. Ceiling-mount positions the robot over a floor-level positioner, maximising cell floor space and enabling 360° access to large structural components. Combined with a coordinated positioner (rotary table or tilt-rotate), the M1850-3C-6 covers every surface of a large workpiece in a single program without operator intervention.

Application Scenarios

M Series Internal Comparison

Choosing between M1400-3C-6 and M1850-3C-6: If your largest workpiece fits within 1,200 mm, the M1400 provides a smaller cell footprint at lower cost. Once your workpiece exceeds 1,200 mm — particularly above 1,300 mm — the M1850 eliminates the fixture repositioning step that would otherwise be required, making it faster and more accurate for the application.

Customer Case Study

By Fannie Chen, CEO, Shenzhen Guanhong Automation Co., Ltd. (SZGH) | May 2026

In early 2024 I received an inquiry from a sheet-metal manufacturer in Morocco. They supplied door inner panels and engine hood inners to a European OEM supply chain — parts up to 1,400 mm × 900 mm, weighing 18–22 kg each. After stamping and welding, every part needed grinding along the weld points and edges before it could go downstream.

They were running six workers per shift, sharing the job by area. On a good shift they finished about 120 parts. The problem wasn't just throughput — their European customer had flagged quality deviations multiple times. On a bad shift with a new worker, the rejection rate climbed. Recruiting skilled grinders took three months of training. People left, and the knowledge went with them.

When I reviewed their workpiece dimensions, the answer was straightforward: at 1,400 mm long, they needed a robot that could reach across the entire part without repositioning. That pointed directly to the M1850-3C-6. Its 1,850 mm reach meant the robot could run one continuous grinding path from one end of the panel to the other. We paired it with a pneumatic floating grinding head and used the force-controlled parameters in the grinding process package to handle the slight surface curvature at the door's shoulder line, where a rigid tool would either skip or dig in.

Commissioning took eleven days on-site. After stabilisation, single-shift output rose from 120 parts to 380 parts. Grinding pass rate went from approximately 79% to 98.5%.

A few weeks after go-live, the production director sent me a message. It said: "Fannie, now we don't need to worry about the workers leaving anymore."

I've had customers share bigger numbers. But that line stays with me. Automation shouldn't just fix a throughput problem — it should take the pressure off the people running the factory. That's what this machine did.

Control System & Grinding Process Package

SZGH Controller

The M1850-3C-6 ships with the SZGH proprietary robot controller, featuring:

• Multi-axis coordinated motion — synchronised control of all 6 robot axes plus up to 2 external positioner axes (coordinated motion).

• Teach pendant — colour touchscreen, intuitive programming interface, multi-language support (Chinese / English).

• PC-based offline programming — import CAD geometry, auto-generate grinding paths, simulate before deployment.

• Safety-rated I/O — compliant with functional safety requirements for Category 3 / PLd stop circuits.

Grinding Process Package (M Series Exclusive Feature)

The grinding process package is pre-installed in the M1850-3C-6 controller and is the defining capability of the M series. Key components:

Positioner Coordination (Recommended for Large Workpieces)

For workpieces requiring access to all six faces — such as large structural weldments — the M1850-3C-6 is designed to operate in coordinated mode with SZGH rotary positioners. The controller synchronises robot and positioner as a single 8-axis system. This eliminates manual workpiece repositioning entirely and enables full-coverage automated grinding programs.

Certifications & Warranty

Frequently Asked Questions

Q1: What is the maximum workpiece size the M1850-3C-6 can grind in a single program without repositioning?

With its 1,850 mm reach, the robot can cover workpieces up to approximately 1,600–1,700 mm in length when mounted on the ground with a standard fixture. Combined with a SZGH rotary positioner in coordinated mode, it accesses all faces of a large structural component without any manual repositioning step.

Q2: How does the M1850-3C-6 differ from the M1400-3C-6?

The M1850-3C-6 extends reach by 450 mm over the M1400-3C-6 (1,850 mm vs 1,400 mm). The trade-off is a slight reduction in payload (30 kg vs 20 kg on M1400, though M1850 carries more). For workpieces exceeding 1,200–1,300 mm in their longest dimension, the M1850 eliminates the fixture repositioning step required on the M1400, improving throughput and reducing positional error. Both models carry the full grinding process package and the 3C high-rigidity joint design.

Q3: What grinding tools are compatible with the M1850-3C-6?

The robot's grinding process package includes integration interfaces for: pneumatic floating grinding wheels (compliance range ±10 mm), abrasive belt machines in contact-wheel configuration, rotary polishing buff heads, and flap-disc spindle units. SZGH provides a recommended tooling list, and third-party tools with standard pneumatic/electrical interfaces are also compatible.

Q4: What is the force range supported by the force-controlled grinding parameters?

The built-in force-controlled parameters support configurable normal contact forces from 5 N to 80 N. This range covers light polishing (5–15 N), standard deburring (20–50 N), and heavy stock removal (50–80 N). Force adjustments are programmed at the teach pendant or via the offline programming software.

Q5: Can the M1850-3C-6 be ceiling-mounted?

Yes. The robot supports ground, bracket, and ceiling mounting configurations. Ceiling mounting is commonly used in cells where the workpiece is held on a floor-level rotary positioner, giving the robot full overhead access to the upper faces and edges of large structural components.

Q6: How long does commissioning typically take?

For a standard single-robot grinding cell with pre-prepared fixtures and an experienced SZGH application engineer on-site, commissioning typically takes 7–14 days. Cells with complex workpiece geometries or multi-axis positioner coordination may require up to 20 days. SZGH provides remote support via WhatsApp and controller network diagnostics throughout the process.

Q7: What communication protocols does the SZGH controller support for factory integration?

The SZGH controller supports Modbus TCP/IP, Profinet, EtherNet/IP, and standard digital I/O (24 V). This enables integration with PLC-controlled production lines, conveyor systems, and ERP/MES data collection. Protocol-specific wiring diagrams are included in the controller documentation package.

Q8: Does SZGH provide training for the M1850-3C-6?

Yes. SZGH offers: (1) on-site commissioning training during installation, covering basic programming, grinding parameter setup, and routine maintenance; (2) factory training at the Shenzhen facility for in-depth controller programming and grinding process package configuration; (3) ongoing remote technical support 24/5 via WhatsApp for post-commissioning questions.

Get a Quote — Contact SZGH

Enquire about the SZGH-M1850-3C-6 for your application. Send your workpiece dimensions, material, current process, and target throughput to receive a tailored application assessment and pricing.

Response time: WhatsApp enquiries receive a technical response within 24 hours (24/5). Email enquiries are responded to within 1 business day.
What to include in your enquiry: workpiece dimensions (L × W × H), workpiece material, surface finish requirement (Ra target), current annual volume, and preferred robot mounting configuration.

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