USED MORI SEIKI SL 403C/800 – 2012

The MORI SEIKI SL 403C/800 – 2012 is a heavy-duty CNC turning center designed for machining large-diameter and long workpieces. The SL 403C is part of Mori Seiki’s SL series of high-rigidity CNC lathes, developed for production turning applications requiring substantial spindle power, large bar capacity, and long turning lengths.

The /800 configuration provides approximately 800 mm of maximum turning length, making this machine suitable for components that require significantly more longitudinal capacity than standard configurations. The SL 403C platform is built around a large turning envelope and heavy-duty spindle, making it appropriate for demanding roughing and finishing operations.

Typical configurations feature a 15-inch hydraulic chuck, approximately 4-inch spindle bore, 3,000 RPM spindle, and a 12-station turret. Depending on the exact machine configuration, spindle motor ratings, chuck specifications, control system, and options can vary.

A 2012 SL 403C/800 remains attractive in the used market because of its combination of large workpiece capacity, high spindle torque, rigid construction, and proven Mori Seiki mechanical design.

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MORI SEIKI SL 403C/800 – 2012 – AXIS

Specification	Details
Machine Type	CNC Turning Center
Axis Configuration	2-Axis
X-Axis Travel	Approx. 430 mm / 16.9″
Z-Axis Travel	Approx. 800 mm / 31.5″
C-Axis	Optional / Configuration Dependent
Y-Axis	Not Standard
Turning Capability	Standard
Rigid Tapping	Configuration Dependent
Tailstock	Available
Automatic Turret Indexing	Standard

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MORI SEIKI SL 403C/800 – 2012 – AXIS TRAVELS / WORK ENVELOPE

Specification	Details
X-Axis Travel	Approx. 16.9″ / 430 mm
Z-Axis Travel	Approx. 31.5″ / 800 mm
Maximum Turning Diameter	Approx. 24″ / 610 mm
Maximum Turning Length	Approx. 31.5″ / 800 mm
Spindle Bore	Approx. 4″ / 105 mm
Bar Capacity	Approx. 4″
Chuck Size	Approx. 15″
Tailstock	Available
Work Envelope	Large-Diameter Turning

The 800-mm turning-length configuration provides substantial capacity for long shafts, large housings, flanges, and other heavy components.

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MORI SEIKI SL 403C/800 – 2012 – CAPACITY / CHUCK

Specification	Details
Main Chuck	Approx. 15″ Hydraulic Chuck
Maximum Turning Diameter	Approx. 24″
Maximum Turning Length	Approx. 31.5″
Spindle Bore	Approx. 4.1″ / 105 mm
Bar Capacity	Approx. 4″
Workholding	Hydraulic Chuck
Collet Capability	Configuration Dependent
Tailstock	Available
Tailstock Quill	Configuration Dependent
Steady Rest	Optional

The large chuck and spindle bore make the SL 403C/800 particularly useful for larger-diameter bar work and heavy components.

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MORI SEIKI SL 403C/800 – 2012 – SPINDLE

Specification	Details
Spindle Type	Heavy-Duty CNC Turning Spindle
Spindle Taper	Configuration Dependent
Maximum Spindle Speed	Approx. 3,000 RPM
Spindle Motor	Approx. 40 HP
Maximum Torque	High-Torque Configuration
Spindle Bore	Approx. 4.1″
Spindle Nose	Configuration Dependent
Spindle Orientation	Standard
C-Axis	Configuration Dependent
Through-Spindle Coolant	Available

The large spindle is designed for high-torque turning and heavy material removal. The relatively moderate maximum RPM is appropriate for a machine intended to handle larger workpieces.

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MORI SEIKI SL 403C/800 – 2012 – TOOL TURRET

Specification	Details
Turret Type	Automatic Turning Turret
Tool Stations	12
Tool Interface	Configuration Dependent
Automatic Indexing	Standard
Turret Indexing	High Speed
External Turning Tools	Supported
Boring Bars	Supported
Grooving Tools	Supported
Threading Tools	Supported
Drill Holders	Available

The 12-station turret provides sufficient tooling flexibility for common roughing, finishing, boring, grooving, and threading operations.

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MORI SEIKI SL 403C/800 – 2012 – CONTROL SYSTEM

Specification	Details
CNC Control	MORI SEIKI MSX Series / MAPPS
Control Manufacturer	MORI SEIKI
Display	Color LCD
Programming	G-Code
Conversational Programming	Available
Tool Offset Management	Standard
Work Offset Management	Standard
Tool Nose Compensation	Standard
C-Axis Programming	Configuration Dependent
Diagnostics	Standard
Ethernet	Configuration Dependent
Data Transfer	Available

The exact control should be verified against the individual 2012 machine because SL 403C configurations can differ by production market and installed options.

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MORI SEIKI SL 403C/800 – 2012 – FEEDRATES

Specification	Details
X-Axis Rapid Traverse	Approx. 12 m/min
Z-Axis Rapid Traverse	Approx. 15 m/min
Maximum Cutting Feedrate	Configuration Dependent
Feedrate Override	Standard
Linear Interpolation	Yes
Circular Interpolation	Yes
Rapid Traverse	High-Speed
Automatic Feed Control	Available

The rapid traverse system helps minimize non-cutting time while maintaining the stability expected from a large turning center.

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MORI SEIKI SL 403C/800 – 2012 – COOLANT & CHIP MANAGEMENT

Specification	Details
Flood Coolant	Standard
Coolant Pump	Standard
Coolant Tank	Standard
High-Pressure Coolant	Optional
Through-Tool Coolant	Available
Chip Conveyor	Available
Chip Management	Automated
Coolant Filtration	Configuration Dependent
Oil Skimmer	Optional
Mist Collector	Optional

A chip conveyor is particularly useful on this machine because heavy turning operations can generate substantial quantities of long and heavy chips.

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MORI SEIKI SL 403C/800 – 2012 – TAILSTOCK / WORK SUPPORT

Specification	Details
Tailstock	Available
Tailstock Type	Programmable / Hydraulic
Quill	Configuration Dependent
Center Support	Available
Long-Part Support	Standard Capability
Steady Rest	Optional
Hydraulic Tailstock	Available
Programmable Positioning	Configuration Dependent

Tailstock support improves stability when machining long shafts and other workpieces with high length-to-diameter ratios.

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MORI SEIKI SL 403C/800 – 2012 – AUTOMATION

Specification	Details
Automatic Turret Indexing	Standard
Bar Feeder Compatibility	Available
Parts Catcher	Optional
Tool Presetter	Optional
Work Probe	Configuration Dependent
Automatic Tool Measurement	Available
Bar Puller	Available
Robotic Loading	Possible
Production Automation	Available

The machine can be integrated with bar feeders, parts catchers, and other equipment for higher-volume production.

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MORI SEIKI SL 403C/800 – 2012 – POWER REQUIREMENTS

Specification	Details
Main Spindle Motor	Approx. 40 HP
Electrical Service	Industrial Three-Phase
Input Voltage	Configuration Dependent
Shop Air	Required
Hydraulic System	Standard
Electrical Cabinet	MORI SEIKI
Power Requirements	Machine Specific
Transformer	Configuration Dependent
Installation	Industrial

Electrical requirements should be confirmed from the specific machine’s electrical documentation before installation.

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MORI SEIKI SL 403C/800 – 2012 – DIMENSIONS

Specification	Details
Machine Type	Heavy-Duty Enclosed CNC Lathe
Approximate Machine Width	150″
Approximate Machine Depth	80″
Approximate Machine Height	85″
Machine Weight	Approx. 17,000–20,000 lbs
Floor Space	Large
Installation	Industrial
Rigging	Required
Chip Conveyor	Adds Overall Length

Actual dimensions and weight vary according to chuck, tailstock, chip conveyor, coolant system, and other installed options.

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MORI SEIKI SL 403C/800 – 2012 – GENERAL INFORMATION

Specification	Details
Manufacturer	Mori Seiki
Model	SL 403C/800
Year	2012
Machine Category	CNC Turning Center
Machine Type	Heavy-Duty CNC Lathe
Axis Configuration	2-Axis
X-Axis Travel	Approx. 16.9″
Z-Axis Travel	Approx. 31.5″
Maximum Turning Diameter	Approx. 24″
Maximum Turning Length	Approx. 31.5″
Chuck Size	Approx. 15″
Spindle Bore	Approx. 4.1″
Bar Capacity	Approx. 4″
Spindle Speed	Approx. 3,000 RPM
Spindle Power	Approx. 40 HP
Turret	12-Station
Tailstock	Available
CNC Control	MORI SEIKI MSX / MAPPS
Chip Conveyor	Configuration Dependent
Bar Feeder	Optional

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INDUSTRIES THAT USE MORI SEIKI SL 403C/800

The MORI SEIKI SL 403C/800 is suitable for:

• Oil and gas
• Energy
• Heavy equipment
• Automotive
• Aerospace
• Defense
• Mining
• Industrial machinery
• Hydraulic manufacturing
• Pump manufacturing
• General machine shops
• Contract manufacturing
• Large-component machining
• Job shops

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TYPICAL PARTS MORI SEIKI SL 403C/800 CAN PRODUCE

The SL 403C/800 can produce:

• Large shafts
• Flanges
• Bushings
• Housings
• Couplings
• Rollers
• Pump components
• Valve bodies
• Hydraulic components
• Oilfield components
• Heavy equipment components
• Industrial machine components
• Large threaded components
• Precision cylindrical parts

Typical operations include OD turning, ID turning, facing, boring, grooving, threading, drilling, chamfering, profiling, and heavy roughing.

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WHY CHOOSE MORI SEIKI SL 403C/800

The main advantage of the MORI SEIKI SL 403C/800 is its heavy-duty construction and large machining envelope. The machine is designed for shops that need considerably more capacity and rigidity than a conventional small or medium CNC lathe.

The approximately 15-inch chuck, 4-inch spindle bore, 40 HP-class spindle, and 800-mm turning length make it particularly suitable for larger and heavier workpieces.

The machine’s rigid construction is valuable when performing aggressive roughing operations. High spindle torque allows substantial material removal while maintaining stability.

The 800-mm configuration is also useful for long components such as shafts, rollers, hydraulic cylinders, and industrial machine components. A tailstock can provide additional support when machining long workpieces.

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WHY BUY USED MORI SEIKI SL 403C/800 – 2012

A used 2012 MORI SEIKI SL 403C/800 can be an excellent choice for manufacturers that need heavy-duty turning capacity without the acquisition cost of a new large CNC lathe.

Mori Seiki machines are known for rigid construction and long-term serviceability, making older SL-series machines attractive to shops that prioritize durability and machining stability.

Before purchasing, buyers should inspect the spindle, spindle bearings, ballscrew, linear guides, turret, hydraulic system, tailstock, chuck, electrical cabinet, and CNC control.

Special attention should be paid to spindle runout, bearing noise, axis backlash, turret indexing, chuck condition, tailstock alignment, hydraulic pressure, lubrication, and crash damage.

For a machine of this age, the condition of the spindle and ways is particularly important. A well-maintained machine with documented service history can be considerably more valuable than a low-priced machine requiring major refurbishment.

Buyers should also verify whether the machine includes a chip conveyor, tailstock, tooling, steady rest, bar feeder, and high-pressure coolant, as these options can substantially affect its practical production value.

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HOW MUCH DOES A USED MORI SEIKI SL 403C/800 – 2012 COST?

The value of a 2012 MORI SEIKI SL 403C/800 depends heavily on spindle hours, mechanical condition, control condition, chuck condition, tooling, tailstock, chip conveyor, and maintenance history.

For inventory valuation, I would use:

USED MORI SEIKI SL 403C/800 – 2012 PRICE RANGE	ESTIMATED COST
High Hours / Basic Configuration	$35,000 – $45,000
Functional Used Machine	$45,000 – $55,000
Good Condition / Production Ready	$55,000 – $65,000
Excellent / Well Equipped	$65,000 – $75,000
Low Hours / Premium Configuration	$75,000 – $85,000+

For a 2012 MORI SEIKI SL 403C/800 in good working condition, I would estimate approximately $50,000–$70,000 USD.

For your inventory listing, I would recommend a practical asking-price range of $60,000–$70,000 USD for a clean, operational machine with reasonable hours, tailstock, chip conveyor, and good tooling.

A particularly clean machine with low spindle hours, excellent spindle condition, extensive tooling, high-pressure coolant, steady rest, and other desirable accessories could potentially command $70,000–$85,000+.

A high-hour machine with worn ways, spindle issues, limited tooling, or control/electrical problems could fall closer to $30,000–$45,000.

Best estimated listing value: $60,000–$70,000 USD.