EMAG HG 204
Image: cdn.emag.com, EMAG
Key Specifications
X Travel
Z Travel
Max Workpiece ⌀
max workpiece length
spindle config option 2
spindle config option 3
How much does the EMAG HG 204 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 HG 204 is an external and internal grinding machine for parts up to 200 mm (8 in) in diameter and 400 mm (15.5 in) long, defined by its B-axis spindle packages. The table lists two of them. One carries 1 external grinding spindle, given as 500 mm, plus 2 internal grinding spindles. The other carries 3 external spindles with a maximum wheel diameter of 400 mm.
The choice between them follows the part. A gear blank, flange or hub with a bore that has to run true to its outside diameter suits the first package, since outside and bore can be ground in one clamping with the B-axis swinging the next spindle into place. A shaft with several diameters, shoulders or faces suits the second, where three external wheels can each be dressed to a different job instead of one wheel being reprofiled between operations.
Wheels can be corundum or CBN, and an automatic balancing unit is listed, which matters with large external wheels because an out-of-balance wheel shows up directly on the ground surface. The axes travel 360 mm (14 in) on X and 1,000 mm (39.5 in) on Z, the same as the HG 2; the HG 208 extends Z to 1,600 mm (63 in).
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 200 mm (8 in) |
| Max Workpiece Length | 400 mm (15.5 in) |
| Spindle Config Option 2 | B-axis with 1 external (500 mm) + 2 internal grinding spindles |
| Spindle Config Option 3 | B-axis with 3 external spindles, 400 mm max wheel diameter |
| Wheel Balancing | Automatic balancing unit |
| Grinding Media | Corundum or CBN |
| X-Axis Travel | 360 mm (14 in) |
| Z-Axis Travel | 1,000 mm (39.5 in) |
Specifications sourced from emag.com — verified 2026-10-03
Strengths & Limitations
Strengths
- B-axis package with 1 external and 2 internal grinding spindles, for bore and outside diameter in one clamping
- Alternative B-axis package with 3 external spindles and wheels up to 400 mm
- Automatic balancing unit for the grinding wheels
- Corundum or CBN grinding media
- 360 mm (14 in) of X travel and 1,000 mm (39.5 in) of Z travel
Limitations
- Workpieces are limited to 200 mm (8 in) in diameter and 400 mm (15.5 in) in length
- The table lists no spindle power, speed or control
- The B-axis packages are listed as numbered options 2 and 3; option 1 is not described
Best For
Frequently Asked Questions
01
The table lists a B-axis with 1 external grinding spindle (given as 500 mm) and 2 internal grinding spindles, and a B-axis with 3 external spindles and a maximum wheel diameter of 400 mm. They are labelled options 2 and 3; the table does not describe an option 1.
02
Yes, with the B-axis package that carries 2 internal grinding spindles next to 1 external spindle. That lets a bore and an outside diameter be ground in the same clamping.
03
Corundum or CBN. An automatic balancing unit is listed for the wheels. On the 3-spindle external package, wheels can be up to 400 mm in diameter.
04
Both are listed with 200 mm (8 in) diameter, 400 mm (15.5 in) length, 360 mm (14 in) of X and 1,000 mm (39.5 in) of Z. The HG 204 table adds the B-axis spindle packages, automatic wheel balancing and corundum or CBN wheels, none of which the HG 2 table lists.
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