M4P by Bernardo MR13S Twist Drill Bit Sharpener: Precise Sharpening of Drill Bits from 2 to 13 mm

The M4P by Bernardo MR13S twist drill bit sharpener is a compact machine designed for sharpening metal drill bits from 2 to 13 mm in diameter. It restores the cutting edges of worn drill bits, helps maintain an appropriate drill point geometry and extends the useful life of drilling tools.

Particularly suitable for mechanical workshops, metalworking professionals and users of pillar drills or drilling and milling machines, the M4P MR13S drill bit sharpener provides a practical solution for the regular maintenance of twist drill bits.

Thanks to its adjustable drill point angle from 90° to 135°, it allows the sharpening geometry to be adapted to the characteristics of the drill bit and the intended drilling application.

The machine also features a drill point thinning device, particularly useful for improving point centring and reducing the axial force required during drilling.

Its 120 W motor, 4400 rpm grinding wheel speed and ER20 collet holding system contribute to consistent and repeatable sharpening results.

A Drill Bit Sharpener for Metal Twist Drills from 2 to 13 mm

The M4P by Bernardo MR13S is designed for sharpening two-flute twist drill bits with diameters ranging from 2 to 13 mm.

This diameter range covers many of the drill bits commonly used in mechanical workshops, maintenance departments and metal fabrication.

During use, the cutting edges of a drill bit gradually become blunt. A worn drill bit may require greater drilling pressure, generate excessive heat or produce holes with an inconsistent finish.

Sharpening helps restore the cutting edges when the condition of the drill bit allows it, avoiding the need to systematically replace tools that have simply become blunt.

This machine can be used for several applications:

• Resharpening HSS drill bits: maintaining drill bits used for general metal drilling operations.
• Sharpening cobalt drill bits: restoring cutting edges using a compatible grinding wheel.
• Restoring worn cutting edges: maintaining drill bits showing normal signs of wear.
• Adjusting the drill point angle: sharpening within the machine's specified adjustment range.
• Performing drill point thinning: improving the geometry of the drill point.
• Maintaining workshop drilling tools: carrying out regular sharpening operations in mechanical and maintenance workshops.

The machine can also be used to sharpen certain carbide drill bits, provided that a compatible diamond grinding wheel suitable for this material is installed.

Adjustable Drill Point Angle from 90° to 135° for Different Drilling Applications

One of the main advantages of the M4P MR13S drill bit sharpener is its adjustable sharpening angle from 90° to 135°.

This adjustment range allows different drill point geometries to be reproduced according to the type of drill bit and the drilling operation to be performed.

The drill point angle influences how the drill enters the material, the cutting forces generated and the behaviour of the tool during drilling.

A 118° point angle is commonly used on HSS twist drill bits intended for general metalworking applications. Other angles may be preferred depending on the drill bit geometry and the manufacturer's recommendations.

Thanks to its wide adjustment range, the MR13S allows the appropriate angle to be selected without being limited to a single sharpening configuration.

However, it is important to respect the original characteristics of the drill bit and avoid unnecessarily modifying its geometry when it has been designed for a specific application.

Drill Point Thinning Function to Improve Centring and Reduce Drilling Force

The M4P by Bernardo MR13S also stands out thanks to its integrated drill point thinning function.

On a conventional twist drill bit, the central web is the section located between the two flutes. At the drill point, it forms a chisel edge that does not cut the material in the same way as the main cutting lips.

This central area can generate considerable axial force, particularly when the drill bit has a relatively thick web.

Drill point thinning consists of locally modifying this geometry to reduce the width of the chisel edge.

When performed correctly, this additional sharpening operation offers several advantages:

• Improved centring: the drill point can enter the material more easily.
• Reduced axial force: less pressure may be required to start drilling.
• Better starting performance: the drill bit may be less likely to wander across the workpiece surface.
• Optimised point geometry: the cutting tool can regain characteristics better suited to its intended application.

This feature represents a valuable advantage over basic drill bit sharpeners that only allow the two main cutting lips to be sharpened.

ER20 Collet Holding System for Accurate Drill Bit Sharpening

The MR13S twist drill bit sharpener uses an ER20 collet clamping system to hold the drill bit securely during the preparation and sharpening stages.

This system allows the drill bit to be positioned in a collet holder suited to its diameter.

Correct drill bit positioning is essential for achieving consistent point geometry and minimising differences between the two cutting lips.

The machine is supplied with 11 ER20 collets with the following nominal sizes:

• 3 mm
• 4 mm
• 5 mm
• 6 mm
• 7 mm
• 8 mm
• 9 mm
• 10 mm
• 11 mm
• 12 mm
• 13 mm

An ER20 collet holder is also included in the standard equipment.

For small-diameter drill bits, it is important to check that the selected collet is compatible with the actual diameter of the drill bit shank.

Positioning and clamping must be carried out in accordance with the manufacturer's instructions to ensure accurate sharpening results.

CBN Grinding Wheel Included for Sharpening HSS Drill Bits

The M4P MR13S drill bit sharpener is supplied with a CBN grinding wheel.

CBN, or cubic boron nitride, is an abrasive particularly suitable for sharpening many high-speed steel tools, including HSS drill bits.

This abrasive technology offers good wear resistance and enables accurate sharpening of cutting edges when the correct operating conditions are observed.

The supplied CBN grinding wheel is therefore suitable for routine sharpening operations on compatible drill bits.

Important: sharpening carbide drill bits requires a compatible diamond grinding wheel. The standard CBN wheel should not be considered a universal grinding wheel for every drill bit material.

The grinding wheel must always be selected according to the drill bit material and the manufacturer's recommendations.

120 W Motor and 4400 rpm Grinding Wheel Speed

The M4P by Bernardo MR13S drill bit sharpener is equipped with a 0.12 kW motor, equivalent to 120 W.

This motor drives the grinding wheel at a speed of 4400 revolutions per minute.

The machine also features a precision ball-bearing-mounted rotor, contributing to smooth operation and stable rotation.

These characteristics are important for sharpening operations, which require controlled contact between the grinding wheel and the cutting edges of the drill bit.

The machine is designed to provide fast and accurate sharpening operations, provided that the tools are correctly prepared and positioned.

Excessive pressure should be avoided during sharpening to preserve both the cutting edges and the grinding wheel.

A Compact Drill Bit Sharpening Machine for Mechanical Workshops

With dimensions of just 285 x 145 x 155 mm, the MR13S is a compact machine that can easily be installed on a workbench.

Its approximate weight of 7.5 kg makes it convenient to move or store when workshop space is limited.

It therefore provides a practical solution for users who want a dedicated drill bit sharpening machine without installing large equipment.

Its 230 V single-phase power supply allows it to be used in workshops equipped with a suitable electrical installation.

This sharpener is a useful addition to workshops equipped with pillar drills, drilling and milling machines or other metalworking equipment.

Technical Specifications of the M4P by Bernardo MR13S Drill Bit Sharpener

Below are the technical specifications of the M4P MR13S twist drill bit sharpener:

• Brand: M4P by Bernardo
• Model: MR13S
• Manufacturer reference: 1016066
• EAN: 9009468081768
• Machine type: Twist drill bit sharpener
• Drill bit type: Two-flute twist drill bits
• Sharpening diameter: 2 to 13 mm
• Adjustable drill point angle: 90° to 135°
• Drill point thinning function: Yes
• Grinding wheel speed: 4400 rpm
• Motor power: 0.12 kW (120 W)
• Power supply: 230 V single-phase
• Length: 285 mm
• Width: 145 mm
• Height: 155 mm
• Approximate weight: 7.5 kg
• Grinding wheel supplied: CBN grinding wheel
• Clamping system: ER20 collets
• Number of collets supplied: 11
• Nominal collet sizes: 3 to 13 mm
• ER20 collet holder: Included

Standard Equipment Supplied with the M4P MR13S Drill Bit Sharpener

The M4P by Bernardo MR13S twist drill bit sharpener is supplied with the following equipment:

• 1 CBN grinding wheel for sharpening compatible drill bits.
• 11 ER20 collets in nominal sizes 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and 13 mm.
• 1 ER20 collet holder for securing drill bits.

The machine also features an integrated drill point thinning device.

Important: the diamond grinding wheel required for sharpening carbide drill bits is not listed among the standard accessories supplied with the machine.

How to Use a Twist Drill Bit Sharpener Correctly

To achieve satisfactory results with the MR13S, it is important to prepare each drill bit correctly before sharpening.

The first step is to check the general condition of the drill bit. A tool that has simply become blunt can usually be resharpened, while a drill bit showing cracks, significant deformation or severe damage should be carefully inspected and replaced if necessary.

Next, select the ER20 collet suited to the drill bit diameter and position the tool according to the procedure described in the machine's operating manual.

The drill point angle should be adjusted according to the required geometry and the characteristics of the tool.

After sharpening the main cutting lips, the drill point thinning device can be used when this operation is appropriate for the drill bit.

Several precautions help improve sharpening quality:

• Use a grinding wheel suitable for the drill bit material.
• Check that the drill bit is correctly secured in its collet.
• Respect the recommended drill point angle.
• Avoid applying excessive pressure during sharpening.
• Wear appropriate eye protection.
• Wait until the grinding wheel has completely stopped before carrying out any intervention.
• Disconnect the machine from the power supply before maintenance or grinding wheel replacement.

A visual inspection of both cutting lips after sharpening helps verify their consistency and identify any irregularities.

Why Choose the M4P MR13S Drill Bit Sharpener from Probois Machinoutils?

The M4P by Bernardo MR13S twist drill bit sharpener is an excellent solution for users who want to maintain their drilling tools and reduce the need to replace drill bits that have simply become blunt.

Its 2 to 13 mm sharpening capacity, adjustable 90° to 135° drill point angle and drill point thinning function provide useful features for maintaining twist drill bits.

The ER20 collet holding system, included CBN grinding wheel and precision ball-bearing-mounted rotor contribute to smooth and consistent operation.

With its 120 W motor, 230 V power supply and compact dimensions, this machine can easily be accommodated in a mechanical or maintenance workshop.

At Probois Machinoutils, we offer a selection of metalworking machines and accessories, including drill bit sharpeners, pillar drills, drilling and milling machines, metal drill bits and machining accessories.

Choose the M4P by Bernardo MR13S drill bit sharpener to maintain your 2 to 13 mm twist drill bits and restore cutting edges suited to your drilling operations.