Junker Lean Selection
Key Specifications
X Travel
Z Travel
model designation
workpiece diameter
grinding length
clamping length
How much does the Junker Lean Selection cost?
Estimated price range
Our best estimate for a cnc grinding machine in this class — not a quote from Junker Group. Configuration moves it a long way.
Overview
The Junker Lean Selection speed is a CNC cylindrical grinder for small, light parts: 150 mm workpiece diameter, 500 mm of grinding length inside an 800 mm clamping length, and a maximum of 10 kg between centers. Its defining figures are on the wheel side, a 140 m/s peripheral speed on a 20 mm wide wheel, and a wheelhead that swivels through 210° on the B axis.
X travel is 350 mm at 0.001 – 10 m/min and Z travel 1,000 mm at 0.001 – 12 m/min, both with a resolution of 0.0001 mm. The X axis is listed with a direct position sensor with glass scale. On Z the glass scale is optional, so the base machine has glass-scale feedback on X only. The B axis resolves 0.0001° over its 210° range, which lets a narrow wheel be presented to diameters, shoulders and tapers at different angles in one clamping.
The wheelhead comes with one spindle or, optionally, two. The OD grinding spindle has a drive capacity of 12 kW and a 3-point mounting interface, and the grinding wheel diameter is given as 400 / 350 mm. At 12 kW this is a spindle for fast, light cuts with a narrow wheel, not for wide plunge cuts.
The workhead covers 1 – 12,000 1/min with 20 Nm of spindle torque and a 30 mm throughbore, and the tailstock sleeve moves hydraulically. High work speed with modest torque again points to small-diameter parts.
Installation figures are 20 kVA of connection load, a footprint of 3,340 x 2,660 x 2,325 mm (L x W x H) and 12,000 kg of machine weight, the last two without the coolant plant. The JUMAT 3000 and QUICKPOINT 3000 are also listed at 12,000 kg, so plan the foundation as for those machines.
Full Specifications
| Parameter | Value |
|---|---|
| Model Designation | Lean Selection speed |
| Workpiece Diameter | 150 mm |
| Grinding Length | 500 mm |
| Clamping Length | 800 mm |
| Center Height | 150 mm |
| Workpiece Weight Between Centers | max. 10 kg |
| X-Axis Travel | 350 mm |
| X Axis Speed | 0.001 – 10 m/min |
| X Axis Resolution | 0.0001 mm |
| X Axis Position Sensor | Direct position sensor with glass scale |
| Z-Axis Travel | 1,000 mm |
| Z Axis Speed | 0.001 – 12 m/min |
| Z Axis Resolution | 0.0001 mm |
| Z Axis Glass Scale | optional |
| B Axis Swiveling Range | 210° |
| B Axis Resolution | 0.0001° |
| Wheel Head Spindles | With one or, optionally, two spindles |
| OD Grinding Spindle Drive Capacity | 12 kW |
| Grinding Wheel Diameter | 400 / 350 mm |
| Grinding Wheel Width | 20 mm |
| Peripheral Speed | 140 m/s |
| OD Grinding Spindle Mounting Interface | 3-point system |
| Workhead RPM Range | 1 – 12,000 1/min |
| Workhead Spindle Torque | 20 Nm |
| Workhead Spindle Throughbore | 30 mm |
| Tailstock Sleeve Movement | hydraulic |
| Connection Load | 20 kVA |
| Floor Space Required | 3,340 x 2,660 x 2,325 mm (L x W x H, without coolant plant) |
| Machine Weight | 12,000 kg (without coolant plant) |
Specifications sourced from junker-group.com — verified 2026-10-03
Strengths & Limitations
Strengths
- 140 m/s peripheral speed on a 20 mm wide grinding wheel
- B axis swiveling range of 210° with 0.0001° resolution
- 0.0001 mm resolution on X and Z, with a direct position sensor with glass scale on X
- Workhead range of 1 – 12,000 1/min with a 30 mm spindle throughbore
- Z travel of 1,000 mm and 800 mm of clamping length around a 500 mm grinding length
- Wheelhead available with one or, optionally, two spindles
Limitations
- Workpieces are limited to 10 kg between centers and 150 mm in diameter
- The Z-axis glass scale is optional, not standard
- The second wheelhead spindle is an option
- Grinding length is 500 mm although clamping length is 800 mm, so the full clamped length cannot be ground
- 12,000 kg and a 3,340 x 2,660 mm footprint before the coolant plant is added
Best For
Frequently Asked Questions
01
Up to 150 mm in workpiece diameter and a maximum of 10 kg between centers. Clamping length is 800 mm and grinding length 500 mm, with a center height of 150 mm. The workhead spindle has a 30 mm throughbore.
02
Junker lists two. The wheelhead comes with one spindle or, optionally, two. The glass scale on the Z axis is optional, while the X axis is listed with a direct position sensor with glass scale. Check both items on any quotation, because they change what the machine can do in one clamping and how the long axis is measured.
03
X travels 350 mm at 0.001 – 10 m/min and Z travels 1,000 mm at 0.001 – 12 m/min. Both linear axes have a resolution of 0.0001 mm. The B axis has a 210° swiveling range and a resolution of 0.0001°.
04
The OD grinding spindle has a drive capacity of 12 kW and a 3-point mounting interface. Grinding wheel diameter is listed as 400 / 350 mm, wheel width as 20 mm and peripheral speed as 140 m/s.
05
A connection load of 20 kVA and floor space for 3,340 x 2,660 x 2,325 mm (L x W x H). The machine weighs 12,000 kg. Both the footprint and the weight are given without the coolant plant, which needs its own space and supply.
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