SZGH-850 CNC Milling Machine with 4th Axis | 800×500 mm Table | BT40 | 7.5 kW | Multi-Face in One Clamping

What Is the SZGH-850 with 4th & 5th Axis?

The SZGH-850 4-axis configuration mounts a SZGH servo-driven rotary table (A-axis) on the SZGH-850 base machine — an 800×500 mm work envelope, 7.5 kW BT40 spindle, 3,500 kg heavy-duty base, and 10-station tool magazine (12-station optional). The additional rotary axis, controlled natively by the SZGH CNC system, enables the spindle to access multiple faces of a workpiece in one clamping, eliminating repositioning error and reducing total setup time per job.

Technical Specifications

Base Machine (SZGH-850) with 4 Axis Installed

Machining Capacity

Spindle

Tool Magazine

Optional 4th Axis (Rotary Table)

Components & Construction

Machine Dimensions

Key Features & Advantages

Largest Work Envelope in the SZGH 4 -Axis Small-Mill Range — 800×500 mm

The SZGH-850 base offers the largest work envelope in the SZGH compact mill series: 800×500 mm, with 500 mm X-travel and 800 mm Y-travel. This accommodates workpieces that exceed the SZGH-540's 500×400 mm and SZGH-650's 600×500 mm capacity — long aluminum structural extrusions, steel baseplate fixtures, medium mold cavity bases, and hydraulic manifold blocks in the 600–750 mm length range. When the rotary axis is installed and a workpiece is indexed through four faces, the effective work area accessed in one clamping covers all four sides of a part up to approximately 300×300×300 mm cube, without the table repositioning that would be required on a 3-axis machine.

7.5 kW BT40 Spindle — Full Structural Steel and Stainless Capability

The SZGH-850's 7.5 kW spindle motor is the highest-power unit in the SZGH small-mill 4-axis range (the 540 and 650 use 3–5.5 kW). In multi-face machining applications, higher spindle power matters specifically at the transition between faces: when the rotary axis indexes and the spindle must immediately resume cutting into the workpiece at full depth-of-cut without a speed-up delay. The 7.5 kW motor maintains target surface speed through these transitions, which is critical for consistent tool life and surface finish on stainless steel and alloy steel multi-face parts.

3,500 kg Anti-Deformation Base — VMC-Level Damping for Rotary-Axis Multi-Face Work

Adding a rotary axis introduces a new vibration path into the machine structure: cutting forces transfer from the workpiece through the rotary table bearing into the machine table, and from there into the base. On lighter machines (1,900–2,000 kg), this additional vibration path degrades surface finish on the indexed faces. The SZGH-850's 3,500 kg base — approaching full VMC650 (3,400 kg) specification — provides sufficient mass to absorb rotary-table transmitted vibration, maintaining 0.01 mm repeatability across all indexed faces even under Ø30 mm steel drilling loads.

32 mm Ball Screws + 30 mm C3 Linear Rails — Full VMC Drivetrain in a Compact Machine

The SZGH-850 uses the same 32 mm P-grade ball screws and 30 mm C3-grade linear rails as the full VMC series. This is significant in multi-face machining: when the A-axis indexes and the XYZ axes must reposition to the new face origin, positional accuracy of the repositioning move determines cumulative face-to-face relationship error. With 32 mm screws at P-grade (certified to ≤0.012 mm/300 mm), repositioning error between faces is held within the machine's 0.01 mm repeatability specification. Smaller screws (20–25 mm) used on lighter machines accumulate error across the repositioning distance.

12-Station Tool Magazine with 4-Axis — Most Tools Available in SZGH Compact 4-Axis Range

The SZGH-850 supports a 12-station tool magazine with the external axis installed — more than the 540's 8-station limit or the 650's 10-station limit. In multi-face machining, each face typically requires 2–4 tools (center drill, drill, tap, deburr or mill). A 12-station magazine accommodates a complete 3-face drilling-and-tapping program plus face milling tools without any manual tool changes. For mold shops running cavity inserts that require drilling, tapping, profiling, and engraving on three faces, the 12-station ATC enables a full lights-out cycle.

24,000 rpm Electric Spindle Option — High-Speed Contouring for Mold and Electrode Work

The optional 24,000 rpm electric spindle (BT30) transforms the SZGH-850 from a drilling-and-milling machine into a high-speed machining (HSM) platform. For mold shops that run both roughing (7.5 kW BT40 mechanical) and finishing (24,000 rpm electric) work, having both spindle options available on one machine eliminates inter-machine transfer.

SZGH Native 4-Axis Integration — Single Controller, No External Axis Hardware

The rotary axis is integrated directly into the SZGH CNC controller's servo bus — no separate axis driver box, no external parameter interface, no manual speed synchronization. This simplifies installation (one cable set to the rotary table drive), eliminates axis communication lag between the rotary and linear axes, and allows the CAM post-processor to output standard G-code with A-axis words that the controller interprets natively. Shops already using the SZGH system on their lathe or mill fleet will find the 850 4-axis controller interface immediately familiar.

Applications & Industries

The SZGH-850 4-axis targets medium-part multi-face production where the SZGH-540/650's work envelope or spindle power is insufficient.

SZGH-850 vs. SZGH-650 vs. VMC850

Choose SZGH-850 if: workpieces exceed 600×500 mm, the full 7.5 kW spindle is needed for sustained steel multi-face work, or 12-station ATC is required for complex multi-tool multi-face programs.

Choose SZGH-650 if: workpieces fit within 600×500 mm and 5.5 kW spindle is sufficient — a more compact and lower-cost configuration for the same multi-face workflow.

Choose VMC850 if: precision tighter than 0.01 mm repeatability is required, Z-axis travel beyond 300 mm is needed, or production volume justifies a full-specification VMC investment with 24-station ATC.

Certifications & Quality Assurance

• CE Certified — complies with EU Machinery Directive 2006/42/EC; full documentation for EU customs clearance

• ISO 9001:2015 — quality management system certified across design, manufacturing, and after-sales

• National High-Tech Enterprise — recognized by China's Ministry of Science and Technology since 2018

• 100+ patents — covering base geometry, rotary axis integration, servo coordination, ATC mechanism, and spindle design

• Dynamic balancing — all spindle assemblies factory-balanced; certification document included with delivery

• Pre-shipment inspection — 72-hour run-in cycle including 4-axis index verification, ATC cycle check, and dimensional accuracy report

Frequently Asked Questions

Q1: What is the key advantage of the SZGH-850 over the SZGH-650 for 4 axis work?

Three differences matter in practice: (1) work envelope — the 850's 800×500 mm table accommodates medium-size workpieces that the 650's 600×500 mm table cannot; (2) spindle power — the 850's 7.5 kW motor versus the 650's 5.5 kW provides 36% more power for sustained steel drilling and face milling between axis indexes; (3) tool magazine — the 850 supports up to 12 stations with the external axis installed versus the 650's 10-station limit, enabling more complex multi-tool multi-face programs without manual tool changes.

Q2: Does the SZGH-850 support 4-axis only?

Yes. The SZGH-850 is available in 4-axis configuration with a servo-driven rotary table (A-axis), supporting both index mode (0°/90°/180°/270°) and continuous 4-axis contouring. Specify the 4-axis configuration when enquiring.

Q3: Can the SZGH-850 tap M16–M20 threads in the 4-axis configuration?

Yes. The catalog specification lists M16/M20 as the tapping diameter range (with M10 in aluminum and M6 in steel for rigid tapping; M16–M20 for form tapping in appropriate materials). In multi-face mode, tapping is programmed as a standard canned cycle (G84 rigid tap) applied after the A-axis indexes to the required face — no change to the tapping process compared to 3-axis operation. Confirm specific thread form (cut tap vs. form tap) and material with SZGH application engineering for large-diameter thread programs.

Q4: What is the Z-axis clearance available above the rotary table workpiece?

The SZGH-850 has a table-to-spindle distance range of 150–300 mm and Z-axis travel of 300 mm. With the rotary table installed (center height to be confirmed with SZGH — typically 125 or 170 mm for this class), effective Z clearance above the rotary table center is approximately 130–175 mm at maximum spindle retract. For workpieces taller than this clearance, contact SZGH engineering to confirm fixture and tool-length planning before ordering.

Q5: Is 4-axis machining on the SZGH-850 limited to index mode, or does it support continuous contouring?

Both modes are available. Index mode (locking the A-axis at fixed angles and machining with XYZ) covers the majority of production applications — four-face drilling, tapping, and milling. Continuous 4-axis mode (simultaneous A + XYZ movement) enables helical milling, cam profiles, and spiral engraving. Both modes are programmed in standard G-code (A-word addresses), compatible with Mastercam, Fusion 360, and SolidCAM 4-axis post-processors. SZGH provides post-processor configuration files on request.

Export Markets & Customer References

SZGH-850 with 4 axis machines are operating in production facilities across:

Typical buyer profile: Mold shops requiring medium-part multi-face cavity machining; automotive and hydraulic sub-contract shops producing steel manifold blocks and housings needing 4-face porting; aerospace sub-tier suppliers machining aluminum structural brackets with compound angle features; general sub-contract shops replacing three-setup 3-axis workflows with single-clamp 4-axis production.

Request a Quote

Email: export02@szghtech.com

WhatsApp: +8618925223781

Website: szghtech.com

When enquiring, please specify: (1) axis configuration — 4-axis rotary table (A-axis); (2) workpiece material and dimensions; (3) primary operations (index drilling/tapping vs. continuous contouring); (4) spindle preference — 6,000 rpm BT40 mechanical or 24,000 rpm BT30 electric; (5) tool magazine capacity required (10 or 12 station); and (6) destination country for shipping calculation. This allows SZGH to configure the correct rotary table, controller version, and ATC combination.

Lead time: 20–35 working days from deposit

Warranty: 12 months on all mechanical and electrical components including rotary axis (consumables excluded)

After-sales support: Remote diagnostics via WhatsApp 24/5; local agents in USA, Turkey, Romania, Russia, Egypt, Thailand, and Mexico

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