The Bernardo EMG 30 end mill sharpener sharpens HSS and carbide end mills with diameters 12-30 mm, 2, 3, 4, and up to 6 flute end mills (from Ø 12 mm), point angle adjustment 0°-5°, rotor speed 4,400 rpm, 0.25 kW 230V single-phase motor, CBN grinding wheel included, set of 10 ER 40 collets (12-30 mm). Heavy-duty construction with anti-vibration rubber feet, rotor with precision ball bearings. Weight 25 kg. Made in Austria, distributed in Italy by Krollit as an official Bernardo distributor since 2007.
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Sharpenable End Mill Diameter: 12 – 30 mm
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Number of Flutes: 2, 3, 4 (and 6 from Ø 12 mm)
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Materials: HSS and carbide
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Point Angle: 0° – 5° adjustable
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Rotor Speed: 4,400 rpm
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Motor: 0.25 kW – 230V single-phase
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Weight: 25 kg
Who uses the EMG 30 and for what
The Bernardo EMG 30 is a professional end mill sharpener, sized for machine shops, mold makers, and workshops that want to reduce end mill replacement costs. Sharpening extends the useful life of end mills: a new end mill costs significantly more than sharpening, and a properly sharpened end mill performs almost identically to a new one. The 12-30 mm diameter range covers most standard end mills used in industrial milling. Compatibility with both HSS and carbide, thanks to the included CBN grinding wheel, makes the machine suitable for all types of standard end mills. The supplied set of 10 ER 40 collets (12, 14, 16, 18, 20, 22, 24, 26, 28, 30 mm) covers all operating diameters without additional purchases. The rotor with precision ball bearings and anti-vibration rubber feet offer sharpening quality suitable for professional use. In Krollit customer workshops, it is chosen by machine shops with intensive end mill use, mold makers, and CNC workshops that want to reduce tool replacement costs and maintain consistently efficient cutting edges.
Its place in the Bernardo range
The EMG 30 is the end mill sharpener in the Bernardo range, complementing the DG 13 MD (drill bit sharpener, Ø 2-13 mm range). The difference is in purpose: DG 13 MD for twist drills, EMG 30 for end mills. The sharpening geometries are different, and each machine is optimized for its specific tool type. For workshops that use both drill bits and end mills, the two machines are complementary, not interchangeable. The EMG 30, with its 12-30 mm range and capacity for end mills with up to 6 flutes, covers most standard industrial milling cutters. For end mills outside this range (below 12 mm or above 30 mm) or for special geometries (profile cutters, variable helix end mills), universal CNC sharpeners are required, sized for specialized applications. For standard professional use, the EMG 30 is the reference solution.
Logistics and Krollit support
Bernardo shipping in 5-9 working days (7 days to Southern Italy). At 25 kg, it is shipped in protective packaging and can be easily handled by one person. Original Bernardo CBN grinding wheels, ER 40 collets, and spare parts available from stock with 3-5 working days shipping. Customer support in Italian is available.
Who the EMG 30 is for
| Profile |
Compatibility |
Reason |
| Passionate hobbyist |
Adequate |
A tool for those who regularly sharpen their own end mills. For occasional use (a few sharpenings per month), the cost may be oversized: consider external sharpening services. |
| Machine shop with intensive end mill use |
Recommended |
The CBN grinding wheels and 10 ER 40 collets included cover the entire 12-30 mm range. In-house sharpening drastically reduces end mill replacement costs and procurement times. |
| Mold maker / CNC workshop |
Recommended |
For workshops with regular consumption of standard end mills, the EMG 30 quickly pays for itself. Durable CBN grinding wheel and 0°-5° point angle adjustment offer repeatable sharpening precision. |
Not indicated for: end mills outside the 12-30 mm diameter range (consider universal CNC sharpeners); end mills with special geometries (profile, variable helix); sharpening of twist drills (the DG 13 MD is dedicated); sharpening of broaches, racks, rotary tools other than end mills.
Sharpening capacity
| Specification |
Value |
| End mill diameter |
12 – 30 mm |
| End mill materials |
HSS and carbide |
| Number of flutes |
2, 3, 4 (and 6 from Ø 12 mm) |
| Point angle |
0° – 5° adjustable |
Grinding wheel and rotor
| Specification |
Value |
| Grinding wheel type |
CBN (cubic boron nitride) |
| Rotor speed |
4,400 rpm |
| Rotor bearings |
Precision ball bearings |
Motor and power supply
| Specification |
Value |
| Motor power |
0.25 kW |
| Power supply |
230V – 50Hz – single-phase |
Construction features
| Specification |
Value |
| Structure |
Heavy-duty |
| Feet |
Anti-vibration rubber |
Dimensions and weight
| Specification |
Value |
| Dimensions (L × W × H) |
350 × 270 × 300 mm |
| Weight |
25 kg |
Compliance
| Specification |
Value |
| Marking |
CE |
| Directive |
Machinery Directive 2006/42/EC |
Standard equipment
- CBN grinding wheel
- Set of 10 ER 40 collets (12 / 14 / 16 / 18 / 20 / 22 / 24 / 26 / 28 / 30 mm)
- ER 40 collet holder
Frequently Asked Questions
How long does it take to sharpen a standard end mill?
Complete sharpening of an HSS or carbide end mill typically takes 3-8 minutes per end mill, depending on its initial condition and the number of flutes.
These times are significantly less than the time it takes to purchase and receive a new end mill. For workshops with regular end mill use, the EMG 30 allows them to always maintain efficient cutting edges without relying on external suppliers. The 0°-5° point angle adjustment covers the vast majority of standard sharpening angles for industrial end mills.
Does the CBN grinding wheel really work on carbide?
Yes. CBN (cubic boron nitride) is the standard grinding wheel for sharpening HSS and carbide. For carbide, diamond wheels are sometimes preferred, but CBN is adequate for routine resharpening.
For workshops with predominant use on carbide, an optional diamond grinding wheel is available as an accessory, which provides optimal results on carbide. For mixed HSS-carbide use, the included CBN grinding wheel is the correct choice. Original Bernardo replacement wheels are available from stock with 3-5 working days shipping.
Can I sharpen end mills with 6 flutes?
Yes, but only from Ø 12 mm. For end mills under Ø 12 mm, the maximum number of sharpenable flutes is 4. This is a geometric limit: small end mills with 6 flutes have too little space between flutes for the grinding wheel to access.
Most commercial end mills have 2, 3, or 4 flutes. 6-flute end mills are dedicated to high-feed finishing applications, typically on diameters ≥ 12 mm. The EMG 30 is correctly sized to cover the vast majority of standard end mills.
Does it work with a standard 230V household outlet?
Yes. The 0.25 kW motor only requires a standard domestic power outlet. The power consumption is minimal, equivalent to a small appliance.
The EMG 30 is sized for benchtop use with low power consumption: it can be installed in any workshop or laboratory without the need for dedicated lines. Its compact dimensions (350×270×300 mm) and 25 kg weight allow it to be placed on a standard workbench.
How much cost is saved by sharpening end mills in-house?
In-house sharpening costs a few cents (grinding wheel consumption + operator time) versus the cost of a new HSS end mill (10-50€) or carbide end mill (50-300€). The savings depend on the volume of end mill consumption.
For workshops with regular end mill consumption (even just 5-10 end mills per month), the EMG 30 pays for itself in a few months. A standard end mill can be sharpened 5-10 times before requiring replacement, multiplying the value of the original end mill by that factor. For workshops with intensive CNC use, the annual savings can be significant.
