SZGH-BCi7 | 7 kg Precision Collaborative Robot Arm — ±0.02 mm, No Safety Fence

What Is the SZGH-BCi7?

The SZGH-BCi7 is a 6-axis, 7 kg payload collaborative robot from SZGH's BC i Series, designed for precision mid-load applications where both accuracy and reach must be uncompromised. With a 786.5 mm reach and ±0.02 mm repeatability — the highest precision tier in the entire BC i Series — it serves medical device assembly, semiconductor inspection, and precision instrument manufacturing in facilities demanding repeatable sub-millimeter performance alongside human operators.

Full Technical Specifications

5 Reasons Precision Manufacturers Choose the BCi7

No Safety Fence Required — PL=d CAT 3 Certified

Traditional industrial robots in the 7 kg payload class almost always require a full safety cell — floor markings, interlocked doors, and dedicated floor area that cannot be reconfigured without a new risk assessment. The BCi7 breaks that constraint. Certified to Performance Level d, Category 3 under EN ISO 13849, it uses a 10-level collision detection system to monitor joint torques in real time, stopping within 0.15 seconds on any unexpected contact. Medical device manufacturers operating in ISO 13485-certified facilities have deployed the BCi7 on open benches alongside quality inspectors without modifications to their existing facility layout — a compliance advantage that also eliminates the cost of building and certifying a dedicated robot cell.

Deploy in Half a Day — Zero Robot Experience Required

The BCi7 supports drag-teach across all six axes: move the arm physically through the desired path and save the program. The teach pendant's visual interface displays joint positions, Cartesian coordinates, and collision sensitivity on a single screen, in plain English, without any mode switching. For a typical medical device sub-assembly sequence — pick component, orient, insert, verify — a production engineer unfamiliar with robotics completes programming in under two hours. Redeployment to a different product variant requires only re-teaching the waypoints, not rewriting a program or re-certifying the cell.

Open System — Connect to Any PLC, Vision System, or AGV

The BCi7's control box provides 16+16 DI, 16+16 DO, and 4×AI/4×AO, with native Ethernet, Modbus-RTU/TCP, and optional Profinet connectivity. The full SDK supports C, C++, Lua, and Python, with a complete ROS package for research and advanced integration environments. In practice, this means the BCi7 connects directly to Siemens S7-1500 lines via Profinet, receives vision corrections from Keyence or Cognex systems via Ethernet, and triggers AGV handoffs via DO contacts — without any intermediate gateway hardware. System integrators in the German medical device sector report full PLC integration completed within a single commissioning day.

±0.02 mm Repeatability — Highest Precision in the Entire BC i Series

At ±0.02 mm, the BCi7 sits at the top of the SZGH collaborative robot precision scale — matching the BCi3 and significantly tighter than the BCi5 (±0.05 mm), BCi12 (±0.03 mm), or BCi10 (±0.10 mm). In a 7 kg payload class, this level of repeatability is uncommon. For applications such as endoscope lens assembly, dialysis membrane insertion, or orthopedic implant component alignment, the BCi7 reliably returns to the same position within a 40 µm sphere over an eight-hour shift and across temperature variations within the 0–50°C operating range. This makes it suitable for IEC 60601-1 and ISO 13485 manufacturing environments where process validation requires demonstrable, measurable positioning consistency.

6–12 Month ROI, 100% Domestic Core Components

The BCi7 is built from domestically sourced servo joints, drives, and control hardware — an important factor for customers managing supply-chain risk after recent disruptions in imported industrial components. Spare parts ship from SZGH's Shenzhen inventory within five business days. For a German or Korean medical device manufacturer running a two-shift assembly operation where the BCi7 replaces one skilled technician on a repetitive insertion cycle, the typical return on investment horizon is 6–12 months. The 18-month factory warranty and accessible regional service network further compress the total cost of ownership over a five-year product cycle.

Application Scenarios

BC i Series — Full Range Comparison & Selection Guide

Model Group Overview

Group 1 — Compact Precision (BCi3, BCi7)

Group 2 — Standard General-Purpose (BCk5, BCi5)

Group 3 — Long-Reach & Heavy-Load (BCi10, BCi12, BCi16, BCi20)

BCk5 vs. BCi5 — Key Distinction

Both share 5 kg payload and 886.5 mm reach. The BCk5 is optimized for education, training labs, and system integrator prototyping — lower entry cost, emphasis on ease of learning. The BCi5 is the production-grade variant for high-volume manufacturing lines running two or more shifts daily. If your primary use case is production rather than training, specify BCi5.

3-Question Selection Guide

1. Is your tolerance tighter than ±0.03 mm?

   • Yes → BCi3 (≤3 kg parts) or BCi7 (3–7 kg parts)

   • No → continue to question 2

2. Does your part weigh more than 7 kg, or does the task require a reach beyond 900 mm?

   • Yes → BCi10, BCi12, BCi16, or BCi20 depending on payload/reach combination

   • No → continue to question 3

3. Is this a production line running two or more shifts, or a training/prototype cell?

   • Production → BCi5

   • Training / Prototype → BCk5

Customer Case Study

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

"I manage process engineering at a mid-sized orthopedic implant components plant near Stuttgart. We supply to several Class II device OEMs under ISO 13485, and our insertion tolerance on bone screw driver-tip bonding is ±0.025 mm — a spec that was creating consistent rework at our manual station because of operator fatigue variance across a ten-hour shift.
We evaluated three cobots from different manufacturers. Two could not document ±0.02 mm repeatability under independent verification — their datasheets claimed ±0.05 mm. The BCi7 was the only 7 kg cobot that matched our tolerance requirement with third-party test data. We deployed one unit in December 2024. The integration with our Cognex In-Sight 9000 system took two days using the Python SDK — our controls engineer described it as 'the most straightforward robot integration I've done in eight years.'
Rework rate on the bonding station dropped from 3.1% to 0.22% within the first month. We completed our process validation under ISO 13485 Clause 7.5.6 in six weeks, which is faster than any previous equipment qualification at our facility. The no-fence deployment allowed us to keep our QC inspector at the adjacent bench without layout changes. We expect full ROI by Q3 2025 — roughly eleven months from commissioning."

Control System & Integration

The BCi7 runs on SZGH's XI control platform with an EtherCAT real-time bus backbone, delivering deterministic cycle times suitable for synchronized multi-step assembly sequences. The system supports multi-robot coordination, allowing the BCi7 to operate in tandem with a BCi3 or a second BCi7 on a shared worktable without additional hardware. Compatible PLCs include Siemens S7-1200/1500 (Profinet or Modbus-TCP), Omron NX/NJ, Mitsubishi iQ-R, and Keyence KV-8000.

Vision integration supports 2D and 3D systems from Keyence, Cognex, Hikrobot, and Basler. Eye-in-hand and eye-to-hand calibration workflows are configurable through the XI interface or via API calls from the Python SDK. SZGH's offline programming environment allows engineers to simulate the full task program against a digital twin before running on the physical arm — particularly useful for medical device customers completing IQ/OQ/PQ validation sequences where physical run time is costly.

SDK & Developer Integration

Supported Languages

C / C++ / Lua / Python

Supported Protocols

Ethernet / Modbus-RTU / Modbus-TCP / Profinet (optional) / EtherCAT / RS485

ROS Support

Full packages available for ROS1 (Noetic) and ROS2 (Humble). Includes MoveIt! configuration, URDF model, and example launch files with force-control extensions for insertion tasks.

API Documentation

Online developer documentation and SDK download available through the SZGH developer portal at szghtech.com.

Third-Party Integration Examples

• Vision systems: Keyence IV3/IV2, Cognex In-Sight 9000, Hikrobot MV series, Basler ace2

• Force/torque sensors: ATI Axia, Robotiq FT 300-S — for insertion verification and soft-contact applications

• AGV systems: standard I/O handshake via DI/DO or Modbus-TCP

• PLCs: Siemens S7-1200/1500 (Profinet/Modbus), Omron NX/NJ series (EtherCAT/Modbus), Beckhoff TwinCAT (EtherCAT)

Safety Certifications Explained

Certifications & Warranty

Certifications: CE / UL / KCs / ISO 9001 / National High-Tech Enterprise (China MIIT)

Warranty: 18 months from date of delivery. Coverage includes all manufacturing defects in the robot arm, control box, and teach pendant. SZGH maintains a domestic spare-parts inventory with a 5-business-day delivery commitment for all critical components. Extended warranty and on-site service contracts are available for customers with multi-unit deployments, including documentation support for ISO 13485 equipment qualification.

Frequently Asked Questions

Does the SZGH-BCi7 really work without a safety cage?

Yes. The BCi7 is certified to PL=d, CAT 3 under EN ISO 13849 — the European Union's highest collaborative safety performance level. The 10-level collision detection system continuously monitors all six joint torques and stops the arm within 0.15 seconds on unexpected contact. This certification covers deployment alongside human operators in EU (CE), US (UL), and Korean (KCs) facilities without a fixed safety barrier. A site-specific risk assessment is still required, and SZGH's application engineers can provide guidance and documentation to support this process.

Can it connect to my existing PLC, conveyor, or vision system?

Yes. The BCi7's control box provides 32 DI, 32 DO, 4 analog inputs, and 4 analog outputs. Communication options include Ethernet, Modbus-RTU, Modbus-TCP, and optional Profinet for Siemens environments. The full SDK in Python, C, C++, and Lua supports custom integration with Keyence and Cognex vision systems, force/torque sensors, AGV docking signals, and any standard industrial PLC. Customers integrating with Beckhoff TwinCAT via EtherCAT report complete commissioning in under one day.

How long does it take a non-engineer to learn to operate it?

A production engineer or technician with no prior robotics experience typically programs a complete pick-insert-verify cycle using drag-teach in under two hours. The teach pendant interface uses plain-language labels and a visual task builder. For more complex sequences involving vision offsets or force-controlled insertion, SZGH provides online training materials and application support contacts. Full operator proficiency is typically achieved within three to five days of first use.

What's the difference between BCi3 and BCi7? How do I choose?

Both models deliver ±0.02 mm repeatability — the top precision tier in the BC i Series. The BCi3 handles up to 3 kg with a 625 mm reach (16 kg body weight, suited for compact benchtop cells). The BCi7 handles up to 7 kg with a 786.5 mm reach (24 kg body weight, better suited for heavier assemblies and larger workspaces). If your parts or end-of-arm tooling weigh more than 3 kg, or if your layout requires more than 625 mm of reach, the BCi7 is the correct model. Both are equally qualified for 3C, semiconductor, and medical device environments.

Does it support ROS and Python SDK?

Yes. The BCi7 includes full ROS1 (Noetic) and ROS2 (Humble) packages, including a URDF model, MoveIt! configuration files, and example launch scripts with force-control extensions. Python, C, C++, and Lua SDKs are available from the SZGH developer portal at szghtech.com. The Python SDK is documented with API references covering motion, I/O, program management, and real-time data streaming.

Can it be mounted upside down or on a wall?

Yes. The BCi7 supports any-angle mounting: floor-standing, ceiling-inverted, side-wall, and inclined angles. The XI control platform automatically compensates for gravity direction based on the configured mounting orientation. Ceiling-inverted mounting is commonly used when the BCi7 is deployed over a conveyor or assembly carousel where floor space is constrained.

How is after-sales service handled? Are spare parts available?

SZGH provides an 18-month warranty with a 5-business-day spare-parts delivery SLA from domestic Shenzhen stock. International customers in Germany, South Korea, and Southeast Asia are supported through regional distributors with local service engineers. Remote diagnostics are accessible via the XI controller's Ethernet port. For medical device customers requiring equipment maintenance records under ISO 13485, SZGH can provide service documentation in English.

What's the typical ROI timeline?

In two-shift medical device or precision instrument assembly operations, customers typically recover the BCi7 investment in 6–12 months when displacing one skilled technician on a repetitive high-precision task. Facilities with higher local labor costs (e.g., Western Europe) tend toward the shorter end of this range. SZGH's application team can provide a site-specific ROI model based on your shift structure, labor cost, and the specific task being automated — contact us before purchase for a calculation.

Request a Quote

Ready to evaluate the SZGH-BCi7 for your production line? Our application engineers can provide a site-specific recommendation, tolerance verification protocol, and ROI estimate.

Related Products

Explore other models in the BC i Series to find the right fit for your application:

• SZGH-BCi3 — 3 kg Precision Cobot, 625 mm Reach, ±0.02 mm

• SZGH-BCi5 — 5 kg Standard General-Purpose Cobot

• SZGH-BCi12 — 12 kg Long-Arm High-Precision Cobot

• SZGH-BCi16 — 16 kg High-Precision Heavy-Load Cobot