EMAG G 400
Image: emag.com, EMAG
Key Specifications
Max Workpiece ⌀
max workpiece length
grinding wheel diameter
grinding spindle speed
dressing tool diameter
control
How much does the EMAG G 400 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 400 is a gear grinding machine for workpieces up to 400 mm (15.5 in) in diameter and 750 mm (29.5 in) long. Unlike the G 160, G 250 and G 375 H, which are listed with Siemens 840 D sl controls, it runs a Siemens Sinumerik ONE. Its grinding wheel is 300 / 220 mm (12 / 8.5 in) in diameter and 160 mm (6.5 in) wide, running at 80 m/s, and it is dressed with a 123 mm (5 in) tool.
In size it sits between the G 250, at 250 mm (10 in) and 550 mm (21.5 in), and the G 500 H, at 500 mm (19.5 in) and 1,250 mm (49 in). The wheel width and speed match the smaller G 160, which also runs a 160 mm (6.5 in) wide wheel at 80 m/s. The wheel row is not labelled, but read with the G 160's "275 max / 210 min" it most likely gives a new and a worn diameter.
The table is short. It lists no module range, face width, helix angle range, spindle power or machine weight, and those are the figures a gear grinder is normally chosen by. Get them from EMAG before comparing the G 400 with its siblings on anything except diameter and length.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 400 mm (15.5 in) |
| Max Workpiece Length | 750 mm (29.5 in) |
| Grinding Wheel Diameter | 300 / 220 mm (12 / 8.5 in) |
| Grinding Spindle Speed | 80 m/s |
| Dressing Tool Diameter | 123 mm (5 in) |
| CNC Control | Siemens Sinumerik ONE |
| Swivel Angle | ± 45 mm (± 2 in) |
| Grinding Wheel Width | 160 mm (6.5 in) |
Specifications sourced from emag.com — verified 2026-10-03
Strengths & Limitations
Strengths
- Workpieces up to 400 mm (15.5 in) in diameter and 750 mm (29.5 in) long
- Siemens Sinumerik ONE control
- 160 mm (6.5 in) wide grinding wheel of 300 / 220 mm (12 / 8.5 in) diameter at 80 m/s
Limitations
- No module range, face width or helix angle is listed
- No spindle power or machine weight is given, so installation needs EMAG's data
Best For
Frequently Asked Questions
01
Up to 400 mm (15.5 in) in diameter and 750 mm (29.5 in) in length. The table does not give a module range or face width, so check the gear data itself with EMAG.
02
Between them on size. The G 250 takes 250 mm (10 in) diameter and 550 mm (21.5 in) length; the G 500 H takes 500 mm (19.5 in) and 1,250 mm (49 in). The G 400 covers 400 mm (15.5 in) and 750 mm (29.5 in).
03
A Siemens Sinumerik ONE. The G 160, G 250 and G 375 H are listed with Siemens 840 D sl controls, so a shop already running those would be adding a second Siemens control type with this machine.
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