Mikrosa KRONOS M 250
This model was not found in Mikrosa's current lineup when we checked on 2026-10-03 . It may be a superseded or older model; the specifications below are as we last recorded them.
Key Specifications
max workpiece diameter infeed
max workpiece diameter through feed
max workpiece length infeed
grinding wheel diameter
grinding wheel width
regulating wheel diameter
How much does the Mikrosa KRONOS M 250 cost?
Estimated price range
Our best estimate for a cnc grinding machine in this class — not a quote from Mikrosa. Configuration moves it a long way.
Overview
The Mikrosa KRONOS M 250 is a mid-size centerless grinding machine, listed with a 600 mm (23.6 in) grinding wheel up to 300 mm (11.8 in) wide and an infeed capacity of 250 mm (9.8 in) in diameter by 400 mm (15.7 in) in length. Mikrosa's current lineup does not show this model. The listed figures come from a table nobody has confirmed against a maker document, and that matters here because several of its rows disagree with each other.
Begin with the drives, since a buyer can read them off a nameplate: 29.5 hp on the grinding wheel and 7.6 hp on the regulating wheel. The grinding wheel runs at up to 63 m/s. The 350 mm (13.8 in) regulating wheel carries a speed range of 2 to 80 RPM in one row and 600 RPM in another. The table does not explain the difference, so ask which figure the machine in question delivers in grinding.
Capacity has the same problem. Through-feed diameter is listed as up to 150 mm (5.9 in) and infeed diameter as 250 mm (9.8 in), while a separate capacity row reads 3.937". The grinding wheel appears as 600 mm (23.6 in) in one row and 24.016" in another. The differences are small for the wheel and large for the capacity, and a part that depends on the upper end of the range should be checked against the actual machine.
On quality the table gives roundness of ≤ 0.002 mm (2 µm) in production and a surface finish of Ra ≤ 0.2 µm (8 µin). The base is Granitan mineral casting. Both wheels are dressed under CNC by diamond form roll and single-point dresser, the control row names Mikrosa KRONOS grinding software, and the automation row lists PROFINET, robot loading, a parts chute and a post-process gauge interface.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter Infeed | 250 mm (9.8 in) |
| Max Workpiece Diameter Through Feed | 150 mm (5.9 in) |
| Max Workpiece Length Infeed | 400 mm (15.7 in) |
| Grinding Wheel Diameter | 600 mm (23.6 in) |
| Grinding Wheel Width | Up to 300 mm (11.8 in) |
| Regulating Wheel Diameter | 350 mm (13.8 in) |
| Grinding Wheel Peripheral Speed | Up to 63 m/s |
| Regulating Wheel Speed Range | 2 – 80 RPM |
| Roundness Achievable | ≤ 0.002 mm (2 µm) in production |
| Surface Finish Achievable | Ra ≤ 0.2 µm (8 µin) |
| Machine Base | Granitan mineral casting |
| Dressing System | CNC diamond form roll and single-point (both wheels) |
| CNC Control | Siemens 840D sl with Mikrosa KRONOS grinding software |
| Automation Interface | PROFINET, robot loading, parts chute, post-process gauge interface |
| Capacity | 3.937" |
| Grinding Wheel Dia | 24.016" |
| Gw Power | 29.5 hp |
| Regulating Wheel Dia | 13.78" |
| Rw Power | 7.6 hp |
| Rw RPM | 600 RPM |
Specifications sourced from machinetools.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Wheel drives are listed at 29.5 hp for the grinding wheel and 7.6 hp for the regulating wheel
- 600 mm (23.6 in) grinding wheel up to 300 mm (11.8 in) wide, running at up to 63 m/s
- Covers both methods: through-feed up to 150 mm (5.9 in) in diameter and infeed up to 250 mm (9.8 in) by 400 mm (15.7 in) long
- Listed roundness of ≤ 0.002 mm (2 µm) in production and a surface finish of Ra ≤ 0.2 µm (8 µin)
- CNC dressing of both wheels by diamond form roll and single-point dresser
Limitations
- Two rows give different regulating wheel speeds, 2 to 80 RPM and 600 RPM, with no explanation of which applies in grinding
- A capacity row of 3.937" sits beside workpiece diameters of 150 mm (5.9 in) through-feed and 250 mm (9.8 in) infeed, so the real upper limit needs confirming
- The 400 mm (15.7 in) infeed length exceeds the 300 mm (11.8 in) maximum wheel width, so a part near full length cannot be plunge ground in one pass along its whole length
- No machine weight, floor space or minimum workpiece diameter is listed
Best For
Frequently Asked Questions
01
The listed figures are up to 150 mm (5.9 in) in diameter for through-feed grinding and up to 250 mm (9.8 in) in diameter by 400 mm (15.7 in) long for infeed grinding. A separate capacity row reads 3.937", which does not agree with either diameter, so confirm the limit on the machine you are considering.
02
The table lists 29.5 hp for the grinding wheel and 7.6 hp for the regulating wheel. The grinding wheel is 600 mm (23.6 in) in diameter, up to 300 mm (11.8 in) wide, and runs at a peripheral speed of up to 63 m/s.
03
The table is not consistent. One row gives a speed range of 2 to 80 RPM for the 350 mm (13.8 in) regulating wheel and another gives 600 RPM. Nothing in the listed figures says which is the grinding range, so check the machine's own documentation.
04
PROFINET, robot loading, a parts chute and a post-process gauge interface. Both wheels are dressed under CNC with a diamond form roll and a single-point dresser, and the control row names Mikrosa KRONOS grinding software. The table does not say which items were fitted to a particular machine.
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