EMAG G 250 HS
Image: emag.com, EMAG
Key Specifications
Max Workpiece ⌀
max workpiece length
max face width
generating grinding wheel diameter
profile grinding wheel diameter
grinding spindle speed
How much does the EMAG G 250 HS cost?
Estimated price range
Our best estimate for a cnc grinding machine in this class — not a quote from EMAG. Configuration moves it a long way.
Overview
The EMAG G 250 HS is the variant of the G 250 gear grinding machine built around a 20,000 rpm grinding spindle and small wheels for both generating and profile grinding. The generating grinding wheel is listed at 160 / 68 mm (6.5 / 2.5 in) and the profile grinding wheel at 160 / 30 mm (6.5 / 1 in), each 180 mm (7 in) wide.
Small wheels are what this machine is for. A gear with a collar, a second gear or a bearing seat close to the teeth leaves little room for the wheel to run out. The rows read as a range from 160 mm down to 68 mm, or to 30 mm for profile work (the table does not label them), and wheels at the small end clear contours a large wheel would hit. The 20,000 rpm spindle is the other half of that design: a small wheel needs high rotational speed to reach a useful cutting speed at its rim.
Having both wheel types listed also means one machine can generate-grind the main toothing and profile-grind a second, tighter feature. Plan the wheel sizes against the part drawing before ordering, since the table lists diameters but not the module range each wheel covers.
The workpiece envelope matches the standard G 250: 250 mm in diameter, 550 mm (21.5 in) long, with a face width up to 380 mm (15 in) and a helix angle of +45° / -45°. The dressing tool is 123 mm (5 in) in diameter, slightly larger than the 120 mm (4.5 in) of the G 250, and the control is a Siemens 840 D Sl.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 250 mm |
| Max Workpiece Length | 550 mm (21.5 in) |
| Max Face Width | 380 mm (15 in) |
| Generating Grinding Wheel Diameter | 160 / 68 mm (6.5 / 2.5 in) |
| Profile Grinding Wheel Diameter | 160 / 30 mm (6.5 / 1 in) |
| Grinding Spindle Speed | 20,000 rpm |
| Helix Angle | +45° / -45° |
| Dressing Tool Diameter | 123 mm (5 in) |
| CNC Control | Siemens 840 D Sl |
| Grinding Wheel Width | 180 mm (7 in) |
Specifications sourced from emag.com — verified 2026-10-03
Strengths & Limitations
Strengths
- 20,000 rpm grinding spindle for small-diameter wheels
- Generating grinding wheels of 160 / 68 mm (6.5 / 2.5 in) and profile grinding wheels of 160 / 30 mm (6.5 / 1 in)
- Generating and profile grinding wheel sizes both listed for the one machine
- Same workpiece envelope as the G 250: 250 mm diameter, 550 mm (21.5 in) length, 380 mm (15 in) face width
- Helix angle of +45° / -45°
Limitations
- The table lists no module range for this version
- No grinding spindle power or accuracy figure is given
- Workpieces are limited to 250 mm in diameter, the same as the G 250
Best For
Frequently Asked Questions
01
A 20,000 rpm grinding spindle with small wheels: generating grinding wheels of 160 / 68 mm (6.5 / 2.5 in) and profile grinding wheels of 160 / 30 mm (6.5 / 1 in). The standard G 250 lists a single wheel of 170 / 250 mm (6.5 / 10 in) running at 80 m/s.
02
Because of what sits next to the teeth. On a shaft with a collar, a bearing seat or a second gear close to the toothing, a large wheel cannot run out without touching it. A wheel that goes down to 68 mm, or to 30 mm for profile grinding, can.
03
Up to 250 mm in diameter and 550 mm (21.5 in) in length, with a face width of up to 380 mm (15 in) and a helix angle of +45° / -45°. That is the same envelope as the standard G 250.
04
A Siemens 840 D Sl. The dressing tool is 123 mm (5 in) in diameter. The table lists no further control or software features.
More from EMAG
Other CNC Grinding Machines
Schaudt CamGrind L
Supertec G18P-40CNC
Chevalier FRG-800S
Danobat WT-92
Republic Lagun VGC-2418-SE
