Junker Lean Selection

$180,000 - $300,000 Updated 2026-03-14

Key Specifications

Max Workpiece ⌀

350 mm (13.8 in)

Accuracy

0.001 mm (0.00004 in)

grinding type

OD Cylindrical (CBN/conventional, multiple configurations)

center distance

400 - 1,000 mm (15.7 - 39.4 in) depending on model

max grinding length

350 - 800 mm (13.8 - 31.5 in) depending on model

center height

175 mm (6.9 in)

Overview

The Junker Lean Selection is the Junker Group's entry-level high-speed cylindrical grinding platform, designed to bring CBN grinding technology to shops that can't justify the investment in a full JUMAT or Quickpoint system. The concept is simple: take the core Junker grinding technology — high-speed CBN wheels, direct-drive spindles, and proven CNC control — and package it in a standardized configuration that reduces engineering and build time. The result is a machine that delivers genuine Junker grinding performance at a price point roughly 30-40% below their premium production grinders.

The Lean Selection platform covers multiple grinding configurations including cylindrical OD, centerless, and cam grinding variants. The cylindrical OD version offers center distances from 400 to 1,000 mm depending on the model, with grinding wheel speeds up to 120 m/s. The grinding spindle produces 15-22 kW of continuous power, which is sufficient for most job shop and medium-volume production applications. The machine uses linear roller guideways rather than the hydrostatic guideways found on premium Junker machines, which reduces cost while still providing positioning accuracy of 0.001 mm.

The control system is based on the Siemens Sinumerik 840D sl with Junker's grinding cycle overlay software. Programming follows the same workflow as the higher-end Junker machines, so operators who train on the Lean Selection can move to JUMAT or Quickpoint systems without retraining. In-process gauging is available as an option, and the machine supports automatic wheel balancing. The bed is fabricated steel rather than polymer concrete, which makes the machine lighter and easier to install but provides less vibration damping at the highest wheel speeds.

At roughly $180,000-$300,000 new depending on configuration, the Lean Selection fills the gap between conventional cylindrical grinders and full production CBN grinding systems. It competes with machines like the Studer S22/S31, Kellenberger Kel-Vita, and Toyoda GL4 series. For shops grinding 500-5,000 parts per month on hardened steel, it offers a practical entry point into high-speed grinding without the capital commitment of a dedicated production cell.

Full Specifications

Parameter	Value
Grinding Type	OD Cylindrical (CBN/conventional, multiple configurations)
Center Distance	400 - 1,000 mm (15.7 - 39.4 in) depending on model
Max Grinding Length	350 - 800 mm (13.8 - 31.5 in) depending on model
Center Height	175 mm (6.9 in)
Max Workpiece Diameter	350 mm (13.8 in)
Grinding Wheel Speed	Up to 120 m/s peripheral speed
Grinding Spindle Power	15 - 22 kW (20 - 30 hp) continuous
Workhead Speed	Up to 2,000 RPM
CNC Control	Siemens Sinumerik 840D sl with Junker overlay
Number Of Axes	3-4 CNC axes (X, Z, C optional)
Positioning Accuracy	0.001 mm (0.00004 in)
Guideway Type	Linear roller guideways
Machine Weight	5,000 - 6,500 kg (11,023 - 14,330 lb)
Machine Dimensions	3,200 x 2,000 x 2,000 mm (126.0 x 78.7 x 78.7 in)

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

Strengths & Limitations

Strengths

Delivers genuine Junker high-speed CBN grinding technology at 30-40% lower cost than JUMAT and Quickpoint production machines
Standardized configurations reduce lead time and engineering costs compared to fully custom Junker grinding systems
Same Sinumerik 840D sl control and Junker grinding software as premium machines, enabling operator skill transfer across the Junker lineup
CBN wheel speeds up to 120 m/s provide significant cycle time advantages over conventional grinding machines in this price range
Multiple platform variants (cylindrical, centerless, cam) share common architecture, simplifying spare parts and service
Accessible entry point for shops transitioning from conventional abrasives to CBN grinding processes

Limitations

Linear roller guideways provide less vibration damping than hydrostatic guideways found on premium Junker machines, limiting ultimate surface finish capability
Steel fabricated bed offers less thermal stability than the polymer concrete beds used on JUMAT and Quickpoint platforms
15-22 kW grinding spindle may lack power for aggressive stock removal on large-diameter hardened steel parts
In-process gauging is optional rather than standard, adding cost if required for closed-loop size control
Maximum wheel speed of 120 m/s is below the 140-150 m/s capability of premium Junker machines

Best For

Job shops and contract manufacturers looking to add CBN cylindrical grinding capability without a $400K+ investment Medium-volume production shops grinding 500-5,000 hardened steel parts per month that need faster cycle times than conventional grinding Shops already running conventional cylindrical grinders that want to transition to high-speed CBN technology with manageable capital risk Automotive and industrial component manufacturers needing a cost-effective CBN grinding solution for secondary operations Training facilities and shops building grinding expertise before investing in fully automated production grinding cells Multi-part shops that need configuration flexibility across different workpiece types and sizes

Frequently Asked Questions

01 What does a Junker Lean Selection cost?

New Lean Selection machines typically price between $180,000 and $300,000 depending on configuration, center distance, and options. This represents a 30-40% savings over comparable JUMAT configurations.

02 How does the Lean Selection differ from the JUMAT series?

The Lean Selection uses standardized configurations, linear roller guideways (vs. hydrostatic), a steel fabricated bed (vs. polymer concrete), and lower-power spindles. It shares the same Sinumerik 840D sl control and Junker grinding software. The JUMAT is built for higher-volume production with more customization options.

03 Can the Lean Selection use both CBN and conventional wheels?

Yes. While optimized for CBN high-speed grinding, the Lean Selection can also run conventional aluminum oxide and silicon carbide wheels at lower peripheral speeds. This gives shops flexibility to use CBN for production runs and conventional wheels for one-off or low-volume work.

04 What grinding configurations are available?

The Lean Selection platform covers OD cylindrical (between centers and chucking), centerless, and cam grinding variants. Each shares the same base architecture and control system but is configured for the specific grinding application.

05 Is the Lean Selection suitable for lights-out production?

With the optional in-process gauging, automatic wheel balancing, and loader integration, the Lean Selection can run unattended. However, for true 24/7 lights-out production at high volumes, the JUMAT series with its hydrostatic guideways and higher-power spindles is the better choice.