Samputensili G 250H

$600,000 - $950,000 Updated 2026-03-17

Key Specifications

max workpiece outside diameter

250 mm (9.8 in)

max module

8 mm

max face width

300 mm (11.8 in)

max helix angle

±45 degrees

grinding process

Continuous generating grinding (worm wheel)

grinding spindle

Direct-drive, high-speed

Overview

The Samputensili G 250H is a CNC gear grinding machine for external cylindrical gears up to 250 mm (9.8 in) in diameter. Samputensili, the Italian gear machine tool brand within the SAMP Group, builds the G series as its primary generating and profile gear grinding line, with the G 250H targeting the automotive, commercial vehicle, and precision industrial gear market segments where 250 mm capacity covers the majority of production gears.

The G 250H uses continuous generating gear grinding with a dressable CBN or conventional abrasive grinding worm, delivering the tooth-by-tooth involute accuracy required for automotive transmission gears, servo drive gears, and precision industrial gear sets to DIN 3–5 quality after case hardening. The generating grinding process removes case-hardening distortion introduced during heat treatment, bringing gear geometry back within the tight tolerances specified for noise-sensitive and power-dense applications.

Samputensili designed the G 250H around a high-speed direct-drive grinding spindle with an integrated CNC dressing unit for automatic profile maintenance. The dressing unit uses a diamond dressing roller to restore the grinding worm profile in-cycle, enabling extended production without manual dressing intervention. Closed-loop compensation using on-machine probing adjusts for grinding wheel wear and thermal growth, maintaining consistent quality across long production runs without operator adjustment.

The G 250H is equipped with a Siemens Sinumerik CNC running Samputensili's Graphos gear grinding software, which provides gear-specific input screens and stores gear data in a part library for rapid program recall. Topology grinding capability allows the G 250H to apply deliberate profile and lead modifications — crowning, relief, and pressure angle corrections — that optimize tooth contact patterns for noise, load distribution, and longevity in automotive transmissions and precision gear sets.

New G 250H machines are typically priced in the $600,000–$950,000 range. Samputensili positions the G 250H as a high-performance generating grinder for mid-range workpiece diameters, competing against Reishauer, Kapp Niles, and Gleason in the automotive and industrial gear grinding market.

Full Specifications

Parameter	Value
Max Workpiece Outside Diameter	250 mm (9.8 in)
Max Module	8 mm
Max Face Width	300 mm (11.8 in)
Max Helix Angle	±45 degrees
Grinding Process	Continuous generating grinding (worm wheel)
Grinding Spindle	Direct-drive, high-speed
Dressing	Integrated CNC dressing unit, diamond profile roller
Topology Grinding	Profile and lead modification capability
CNC Control	Siemens Sinumerik with Graphos software
Machine Weight	Approx. 12,000 kg (26,500 lb)
Modelg 250brandsamputensilitypegear Grinderscontrolcontact Sales Rep	Contact Sales Rep.
Modelg 250brandsamputensilitypegear Grinderscontrol	Contact Sales Rep.
Model	G 250
Brand	SAMPUTENSILI
Type	Gear Grinders
Max Gear Dia98425controlcnc	Dimensionsmm 4,120 x 2,200 x 2,700
Max Gear Dia98425	ControlCNC (Siemens 840 D sl)
Max Gear Dia	9.8425"
Cnc Control	CNC (Siemens 840 D sl)
Dimensions	mm 4,120 x 2,200 x 2,700
Looking To Purchase A New Samputensili G 250	Contact Sales Rep.
Listings	(1)
Gear Grinders	7 photosYear: 2007
7 Photos	Year: 2007
Star Su Llc5200 Prairie Stone Parkwaysuite 100hoffman Estates Illinois 60192united States	Star-Su Federal de México, S.A. de C.V.ACCESO V Nave 20 No. 115-ADesarrollo La Montaña 2000 Sección IIIQuerétaro, Queretaro de Arteaga 46150Mexico

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

Strengths & Limitations

Strengths

Generating gear grinding delivers the tight involute tolerances (DIN 3–5) required for noise-sensitive automotive transmission and servo drive gears after case hardening
Integrated CNC dressing unit maintains grinding worm profile automatically in-cycle, enabling extended production without manual dressing adjustment
Topology grinding capability provides profile and lead modification for crowning, relief, and contact pattern optimization in automotive and precision gear applications
Graphos gear grinding software simplifies programming with gear-specific input screens and part library for rapid program recall in production environments
Direct-drive grinding spindle eliminates belt or gearbox drive compliance for consistent stock removal and surface finish across the face width

Limitations

250 mm workpiece diameter limit excludes larger industrial gearbox gears that exceed the G 250H's capacity range
Generating grinding requires dressable grinding worms that must be replaced periodically, adding consumable tooling cost that profile grinding with CBN wheels can avoid on high-volume single-gear applications
Gear grinding setup and programming require skilled operators with gear metrology knowledge beyond standard CNC machining experience

Best For

Automotive transmission gear manufacturers grinding helical gears, sun gears, and ring gears to DIN 3–5 quality for passenger car and commercial vehicle applications Precision industrial gear producers requiring consistent generating grinding quality for servo drives, robotics reducers, and high-speed gearboxes Job shops specializing in precision gear finishing where flexible setup for mixed part families favors generating grinding over dedicated profile grinding operations Gear manufacturers evaluating Italian-built generating grinders as alternatives to Reishauer or Kapp Niles at competitive pricing

Frequently Asked Questions

01 What is the difference between generating grinding and profile grinding for gears?

Generating grinding uses a grinding worm that meshes with the workpiece gear in a synchronized rolling motion, producing the involute profile through the generating motion rather than by copying a formed wheel profile. Profile grinding uses a wheel dressed to the exact tooth space shape. Generating grinding is generally faster for batch production of fine-pitch gears, while profile grinding offers advantages for large-module and coarse-pitch applications.

02 What gear quality does the G 250H achieve?

The G 250H is designed to achieve DIN 3–5 quality on external spur and helical gears using continuous generating grinding. DIN 3 is achievable in favorable conditions with quality workpieces and appropriate process controls. DIN 4–5 is a typical production target for automotive transmission gears.

03 Can the G 250H grind gears with crowning?

Yes. The topology grinding capability of the G 250H allows deliberate application of longitudinal crowning (lead crowning) and profile crowning across the tooth flank. Crowning is essential for automotive transmission gears to reduce edge loading, manage misalignment sensitivity, and control gear noise signature.

04 What is the Graphos software and how does it help operators?

Graphos is Samputensili's gear grinding software that runs on the Sinumerik CNC. It provides a graphical interface with gear-specific input parameters — number of teeth, module, helix angle, face width, and modification data — rather than requiring operators to write raw G-code. Part data is stored in a library for instant recall when returning to a previously run gear, reducing setup time significantly in job shop and mixed-production environments.

05 How does the G 250H compare to a Reishauer RZ 300?

Both are continuous generating gear grinders in the similar workpiece diameter range. Reishauer is the pioneering name in generating gear grinding with very broad market penetration in automotive applications. Samputensili's G 250H offers comparable generating grinding capability with Italian engineering and competitive pricing. The choice often depends on existing machine fleet, tooling system preferences, and regional service support.