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Lean Selection allround

Lean Selection allround - Cylindrical grinding machines

Functional, efficient grinding

The Lean Selection allround is a universal CNC OD/ID and internal grinding machine with a high-accuracy B-axis with automatic continuous positioning. With up to three high-capacity grinding spindles and proven JUNKER technology, the Lean Selection allround is perfect for manufacturing single parts and series. Featuring both standardized solutions and individual automation concepts, this machine is economical and flexible at the same time.


  • Freely programmable, continuous B-axis
  • Full protective hood
  • Easy to operate
  • Rigid machine base design
  • Flexible production
  • Fast changeovers
  • High rate of availability
  • Abrasives: corundum, CBN or diamond grinding wheels
  • Wide range of services

Grinding process descriptions

External ground loops with magnetic plate

Inside round grinding with magnetic plate

External ground loops between peaks

Inclined grinding between peaks

Inside round grinding

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Technical data: Lean Selection allround allround

Grinding Length
800 mm
Clamping Length
800 mm
Center Height
150 mm
Component Weight
80 kg
Grinding Wheel Diameter
400-290 mm
WxDxH mm (without peripherals)
3340 x 2660 x 2325
8000 kg

Wheelhead Lean Selection allround allround

  • /B1
  • /B1i
  • /B4 allround
    /B4 allround
  • /B12 allround
    /B12 allround
  • /B12i
  • /B13 allround
    /B13 allround

Equipment and Options

Control system

The Erwin Junker Operator Panel was specifically developed to control grinding machines. All machine components are controlled using the operator panel – irrespective of the series and the used control system. The identical structure, intuitive menu guidance and visualization of the workpiece geometry make for extreme user convenience and flexibility in operation. Programming takes place directly using the operator panel or an external programming tool.

Dressing unit

Grinding wheel dressing is CNC controlled. A driven diamond dressing wheel or a workpiece-dependent diamond profile roller can be used. Dressing takes place manually or using an automatic dressing program with grinding wheel compensation.


Depending on the application, the abrasive CBN or diamond is used. The basic bodies of the grinding wheels comprise steel or carbon. In conjunction with CBN, it can make sense to use a carbon base body: It is light, has vibration-damping properties and remains dimensionally stable even at high speeds.

Machine bed - mineral cast

The machine bed made of mineral cast provides impressive damping behavior and torsional rigidity. The temperature stability allows fluctuations in the ambient temperature to be compensated with a minimum of effort, ensuring a high level of dimensional stability throughout the whole day.

Loading systems

JUNKER offers both internal and external loading systems for all its machine series, depending on customer and workpiece requirements. The loading systems can be combined with different infeed and discharge systems such as conveyor belts or custom tailored systems.

Measurement systems

The measurement systems are also individually adjusted to the various workpieces and customer specifications. The measurement processes entail evaluating the recorded measured values and utilizing them for measurement correction in line with the prepared measurement strategy. A grinding wheel measuring system to determine the diameter, axial position and width of the grinding wheel completes the wide range of systems on offer.

Fire protection and LTA air filters

In case of an fire, the machine interior is automatically hermetically sealed, suffocating a fire before it has a chance to spread. If required, extinguishers (CO² or water mist systems) and exhaust air purification systems can be additionally installed. A competent partner for fire protection and filtration solution solutions is LTA Lufttechnik GmbH, which also belongs to the JUNKER Group and which researches, develops and produces filtration systems for industrial air purification.

The Filtration systems


  • Axle
  • Starter shaft
  • Drive shaft
  • Countershaft
  • Bolt
  • Bushing
  • Excentric shaft
  • Gear shaft
  • Piston pin
  • Piston ring
  • Motor shaft
  • Pump piston
  • Pump pinion
  • Pinion shaft
  • Pipe
  • Roller Bearings
  • Rotor
  • Worm wheel
  • Worm shaft
  • Spindle
  • Rod
  • Stator shaft
  • Stud
  • Turbine shaft
  • Cylinder
  • Rolling element
  • Shaft
  • Tool holder
  • Tool Blank
  • Gearwheel
  • Gear rod
  • Spigot
  • Cylinder rollers
  • Stamp

Product Brochures Lean Selection allround

Lean Selection allroundLean Selection allround
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