Buy & Sell Used SINUMERIK 840C for Sale

SINUMERIK 840C

Seond Hand Siemens SINUMERIK 840C for Sale cheap | Asset-Trade

Buy & Sell Used Machine Tools with Siemens SINUMERIK 840C CNC Control

The Siemens SINUMERIK 840C was a pioneering technological milestone of the 1990s, forming the core computing platform for heavy-duty gantry mills, multi-slide turning centers, and production transfer lines prior to the introduction of the 840D. Featuring a distributed multiprocessor architecture, an integrated SIMATIC S5-155U PLC, and a PC-based Man-Machine Communication (MMC) system running MS-DOS/Windows, the 840C set new standards for multi-channel axis synchronization and system openness.

Typical Machine Applications & Heavy Builders

In the secondary market, the SINUMERIK 840C is predominantly found on robust, heavy-duty machinery with proven cast-iron longevity:

  • Gantry & Bed Milling Centers: Waldrich Siegen, Waldrich Coburg, Schiess, Droop & Rein, Dörries Scharmann.
  • Multi-Turret & Multi-Spindle Lathes: Index (G200, G300), Traub, Gildemeister TWIN and MF-Twin production lathes.
  • Heavy Machining Centers & Flexible Lines: Heller, Hüller Hille, Burkhardt + Weber in automotive and energy sectors.

Key Technical Specifications & Architecture

  • Axis Coordination: Capable of managing up to 30 axes and spindles distributed across up to 6 independent execution channels.
  • Drive System: Paired with modular SIMODRIVE 611A (analog) and early SIMODRIVE 611D (digital) servo drives.
  • Industrial Interfaces: Integrated hard drive and floppy drive storage, standard RS232 / V.24 DNC serial communication.

Inspection Checklist & Maintenance Best Practices

When evaluating a pre-owned machine tool running an 840C controller:

  1. Storage Media & Parameter Backups: Verify that recent disk image backups of the MMC unit and floppy disk archives of NCK/PLC parameters are complete. Retrofitting mechanical hard drives with solid-state CF or SSD modules is strongly recommended.
  2. Backup Batteries: Replace the lithium buffer batteries in NCK and PLC modules strictly while the machine is powered ON to prevent permanent parameter loss.
  3. TFT Display Retrofits: Aging 14-inch or 10-inch CRT cathode ray tube displays can be cost-effectively upgraded with bright, reliable drop-in LED/TFT conversion panels.

Heavy Machinery Inventory: Explore our Waldrich Coburg gantry mills and Index turn-mill centers equipped with 840C controls.

Lifecycle & Retrofit Advisory: Classic Industrial Control

Controllers from this era offer cast-iron electrical reliability. Operators and buyers should observe three essential operational practices:

  • Backup Battery Maintenance: The 3.6V lithium buffer battery retains all critical NCK/PLC parameters and zero offsets. Crucial: Always replace the battery while the control is powered ON to prevent catastrophic parameter loss!
  • Monitor & Memory Retrofits: Aging CRT cathode ray monitors can be upgraded with drop-in, energy-efficient LED/TFT conversion panels. Mechanical hard drives or floppy units can be updated with rugged solid-state CF/SSD adapters or USB DNC emulators.
  • Spare Parts Availability: Reconditioned modular drives, power supplies, and CPU boards remain widely accessible via certified industrial electronics specialists.

📄 Technical Documentation & PDF Manuals for SINUMERIK 840C

Download verified technical specifications, brochures, and programming guidelines:

Note for Service Technicians & CNC Programmers: Inquiring about wiring schematics, parameter manuals, or PLC backup archives? Contact our engineering team.

Selling a Machine Tool with Siemens 840C or Liquidating Industrial Assets?

Asset-Trade directly purchases heavy milling machines, horizontal borers, and CNC turning centers with SINUMERIK 840C controls. We provide professional equipment appraisals, rapid payment, and turnkey heavy-rigging dismantling. Contact Asset-Trade today for your free valuation and direct purchase offer.

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Used INDEX GU 800 lathe with C-axis for Sale

Used INDEX GU 800 - Front view and machine overview
Second hand INDEX Machinery for sale cheap | Asset-Trade
Machine Information
Manufacturer: INDEX
Model: GU 800
Control: CNC > SIEMENS > SINUMERIK 840C
Year of build: 2001
Location:
Buy & Sell Second Hand Machiney from Germany Fast & Cheap
Germany
Used INDEX GU 800 lathe with C-axis for sale The used INDEX CNC lathe GU 800 is ideal for companies looking for a high-precision CNC lathe for precision machining. This machine was completely overhauled in 2010, including the geometry… Learn more
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GILDEMEISTER - CTV 250 vertical CNC lathe

Used DMG GILDEMEISTER CTV 250 - Front view and machine overview
Second Hand DMG Gildemeister Machines for Sale| Asset-Trade
Machine Information
Manufacturer: DMG GILDEMEISTER
Model: CTV 250
Control: CNC > SIEMENS > SINUMERIK 840C
Year of build: 2001
Location:
Buy & Sell Second Hand Machiney from Germany Fast & Cheap
Germany
Used DMG Gildemeister CTV 250 - Vertical CNC Lathe CNC Controlc SIEMENS 840C Technical Data Max diameter: 250 mm Strocke X x Z : 800 x 300 mm spindle power : 22 kW spindle speed : 20 - 5000 tr/min Turret : 12 posts all driven… Learn more
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MONFORTS - DNC 5 with promot loader

Used MONFORTS DNC 5 - Front view and machine overview
Used Monforts Maschines | Asset-Trade
Machine Information
Manufacturer: MONFORTS
Model: DNC 5
Control: CNC > SIEMENS > SINUMERIK 840C
Year of build: 2001
Location:
Buy & Sell Second Hand Machiney from Germany Fast & Cheap
Germany
Used MONFORTS DNC 5 CNC lathe with Promot Cellmaster loader 2x Machines Available Extensive Spare parts kit available New price approx. 50,000 Euros Technical specifications Control: Siemens Type: 840 C Rotating diameter: 520 mm… Learn more
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GLEASON - PFAUTER - G 320 Gear Grinding Maschine vertical

Used GLEASON PFAUTER G 320 - Front view and machine overview
Second Hand Gleason Pfauter Machinery for Sales | Asset-Trade
Machine Information
Manufacturer: GLEASON PFAUTER
Model: G 320
Control: CNC > SIEMENS > SINUMERIK 840C
Year of build: 1996
Location:
Buy Second Hand Machiney from Poland cheap | Asset-Trade
Poland
Used GLEASON- PFAUTER G 320 - Gear grinding machine with numerical control Specifications: Siemens control 840 Modulus of 0.5 to 7 Workpiece diameter 10-330 mm Number of teeth 10-600 Speed ​​: 2300 U / min X horizontal grinding wheel… Learn more
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Advantages buying Used SINUMERIK 840C machines

Here are some advantages of using SIEMENS Sinumerik 840c controller:

  • High CNC performance
  • Flexibility and openness
  • Drive-based, high-performance NCUs
  • State-of-the-art multicore processor technology

Industrial machines need to be economical and reliable.

This is where used SINUMERIK 840C machines help to enhance your production. They are very affordable and immediate available.

With pre-owned SINUMERIK 840C your business can react fast to changing production requirements at the fraction of the cost of new equipment.

Frequently Asked Questions about used SINUMERIK 840C

What is the spare parts availability for the Siemens SINUMERIK 840C today?

Although the 840C has reached end-of-lifecycle from Siemens, a thriving market of certified electronics repairers stocks refurbished NCU boards, SIMODRIVE 611 modules, power supplies, and monitors, allowing cost-effective maintenance.

Can a SINUMERIK 840C CRT monitor be upgraded to modern LCD/TFT?

Yes. Direct drop-in plug-and-play LED/TFT conversion monitors are readily available, matching the exact mechanical dimensions and electrical RGB/EGA video timings of the original CRT monitors.

How are NC programs transferred to the SINUMERIK 840C?

Programs are traditionally transferred via the RS232 / V.24 serial interface connected to a DNC system, or via the onboard 3.5-inch floppy drive. Modern USB floppy emulators and Ethernet bridge modules can also be retrofitted.

Does Asset-Trade purchase machines with 840C controllers directly?

Yes. Asset-Trade acquires second-hand heavy machine tools, boring mills, and multi-axis lathes running SINUMERIK 840C controls directly, providing turnkey decommissioning, heavy crane rigging, and logistics.

News about SINUMERIK 840C at Asset-Trade

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