Samputensili SG 250

$300,000 - $600,000 Updated 2026-03-17

Key Specifications

Max Workpiece ⌀

250 mm (9.8 in)

max face width

250 mm (9.8 in)

gear module range

0.5 - 8 mm

gear types

External spur, external helical

grinding method

Profile gear grinding — formed wheel, sequential tooth-space grinding

wheel type

CBN electroplated, CBN vitrified (with diamond roll dressing), or conventional dressable abrasive

Overview

The Samputensili SG 250 is a CNC gear grinding machine from Samputensili Machine Tools, the gear machine division of SAMP Group headquartered in Bologna, Italy. The SG 250 applies profile gear grinding to external spur and helical gears up to 250 mm pitch diameter, targeting the automotive transmission, motorcycle transmission, and precision industrial gearbox segments where hard finishing to DIN 3-5 quality is required after case hardening or induction hardening of the workpiece.

Samputensili has manufactured gear cutting and finishing machines since 1949, evolving from its origins as a cutter manufacturer to become a full-line gear machine builder offering hobbing machines, shaping machines, shaving machines, and grinding machines. The SG 250 is positioned in the mid-range of Samputensili's grinding portfolio, balancing workpiece capacity with the compact footprint and lower investment cost appropriate for job shops, tier 2 automotive suppliers, and precision industrial gear manufacturers.

Profile gear grinding is the SG 250's core process. A formed grinding wheel — either a CBN electroplated wheel for long runs without dressing, a vitrified CBN wheel with diamond roll dressing, or a conventional dressable abrasive wheel — is traversed through each tooth space of the workpiece gear in sequence. The wheel's cross-section matches the involute profile of the gear's tooth space, ensuring accurate form transfer to each tooth. Between teeth, a CNC indexing rotation advances the workpiece to the next tooth space. This sequential process is well-suited to the variety of gear families typical in a job shop or tier 2 supplier environment, where flexibility to switch between gear families is as important as cycle time.

Control is via Siemens SINUMERIK 840D sl with Samputensili's user-oriented gear programming interface, which accepts standard gear parameters (module, tooth count, pressure angle, helix angle, quality target, profile modifications) and auto-generates the grinding program. Profile modifications — lead crowning, tip relief, profile crowning — are programmable directly from the gear engineering drawing without manual axis interpolation programming. An integrated dressing system manages wheel profile through the production run, with dressing cycle timing and parameters stored as part of the machine's gear-specific process recipes.

The SG 250 is deployed across a broad range of industries: automotive transmission suppliers grinding planetary gear sets, ring gears, and sun gears; motorcycle and powersport gear manufacturers grinding close-ratio transmission gears; precision industrial gearbox makers grinding high-accuracy pinions and wheels; and aerospace subcontractors grinding smaller gearbox components. Samputensili supports the SG 250 with application engineering from its Bologna technical center and a network of regional service agents in Europe, the Americas, and Asia.

Full Specifications

Parameter	Value
Max Workpiece Diameter	250 mm (9.8 in)
Max Face Width	250 mm (9.8 in)
Gear Module Range	0.5 - 8 mm
Gear Types	External spur, external helical
Grinding Method	Profile gear grinding — formed wheel, sequential tooth-space grinding
Wheel Type	CBN electroplated, CBN vitrified (with diamond roll dressing), or conventional dressable abrasive
Gear Quality	DIN 3 - 5 achievable in production
Profile Modifications	Lead crowning, profile crowning, tip relief programmable
CNC Control	Siemens SINUMERIK 840D sl with Samputensili gear programming interface
Dressing	Integrated diamond roll dressing system
Automation Interface	Robot loading/unloading interface available
Machine Weight	Approx. 6,000 - 9,000 kg
Bucuresti	3°C12°C / 3°C
Pm25119 G M3	PM1013.1 µg/m3
Pm25	11.9 µg/m3
Pm10	13.1 µg/m3
Manufacturer	Emag
Model	VSC 250
Power Requirement	60 kW
Grinding Length	1,016 mm

Specifications sourced from machinio.com — verified 2026-03-28

Strengths & Limitations

Strengths

250 mm capacity covers the majority of passenger car transmission gears, motorcycle gears, and smaller industrial gears in a compact, cost-effective machine
Profile grinding's inherent flexibility allows the machine to handle diverse gear families without the wheel changeover complexity of generating grinding setups
CBN wheel options (electroplated for high volume, vitrified for flexibility) allow optimization for different production volumes and gear materials
Siemens SINUMERIK 840D sl control with gear parameter programming reduces setup time and eliminates G-code programming for new jobs
Competitive price point in the $300K-$600K range makes profile gear grinding accessible to job shops and tier 2 suppliers
Samputensili's 75+ years of gear machine manufacturing experience provides a depth of application knowledge in support of the machine

Limitations

Profile grinding's sequential tooth-space process is slower than continuous generating grinding for the same gear size and quality — throughput is lower at equivalent diameters
250 mm pitch diameter limit excludes larger commercial vehicle transmission gears and industrial gearbox components
Electroplated CBN wheels cannot be redressed — when the abrasive layer is worn, the wheel must be replaced, adding tooling cost for high-volume applications
Samputensili's service network, while present in major markets, is less extensive than German and Swiss competitors in some regions
Gear quality ceiling of DIN 3 in production may not satisfy the most demanding aerospace specifications requiring DIN 2

Best For

Tier 2 automotive gear suppliers grinding passenger car transmission gears — planetary sets, sun gears, ring gears — to DIN 3-5 quality after heat treatment Motorcycle and powersport transmission manufacturers grinding close-ratio gears for high-performance applications Job shops serving multiple industries who need a flexible gear grinder capable of handling diverse gear families across automotive, industrial, and aerospace segments Precision industrial gearbox manufacturers grinding smaller pinions and wheels for high-accuracy power transmission applications Aerospace component subcontractors grinding smaller gearbox gears where DIN 3-4 quality is specified

Frequently Asked Questions

01 What process does the Samputensili SG 250 use for gear grinding?

The SG 250 uses profile gear grinding, in which a formed grinding wheel whose cross-section matches the tooth space profile is traversed through each tooth space sequentially. Between teeth, a CNC indexing rotation advances the workpiece to the next tooth. Profile grinding is inherently flexible — the same machine can grind different gear families by changing the grinding wheel and entering new gear parameters — making it well-suited for mixed production environments.

02 What wheel types can the Samputensili SG 250 use?

The SG 250 accepts three main wheel types: CBN electroplated wheels (long wheel life without dressing, ideal for very high-volume production of a single gear family), vitrified CBN wheels with diamond roll dressing (dressable for flexibility across gear families, combining CBN performance with redressability), and conventional dressable abrasive wheels (lower tooling cost, suitable for smaller volumes or materials not suited to CBN). The optimal wheel type depends on gear material, batch size, and quality requirements.

03 What is the maximum workpiece size for the Samputensili SG 250?

The SG 250 accommodates external spur and helical gears up to 250 mm pitch diameter and 250 mm face width, with module range from 0.5 to 8 mm. This covers most passenger car manual and automatic transmission gears, motorcycle transmission gears, and smaller industrial gearbox gears.

04 What gear quality does the SG 250 achieve?

In production conditions, the Samputensili SG 250 achieves DIN 3-5 quality, with DIN 3 achievable in optimized setups with tight process control and good metrology correlation. DIN 3-5 meets the requirements of most automotive, industrial, and standard aerospace gear applications.

05 What is the price of a Samputensili SG 250?

The Samputensili SG 250 typically prices in the range of $300,000 to $600,000 new, depending on wheel type configuration, dressing system, automation, and options. This price range is competitive among European profile gear grinders of equivalent capacity and positions the SG 250 as an accessible option for tier 2 automotive suppliers and job shops.