Forget The Bench Grinder: Sharpen Drill Bits Using A Tool You Already Have

TL;DR

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Hunker reports that a rotary tool such as a Dremel can sharpen twist drill bits, provided the bit is secured and the cutting edges are ground carefully. The technique is a do-it-yourself alternative to a bench grinder, but the report gives no testing data or guarantee that every bit type or condition is suitable.

Hunker has published instructions for sharpening twist drill bits with a Dremel rotary tool, offering a bench-grinder alternative for people who already own one. The method calls for clamping the bit, using the existing cutting angle as a guide and removing only a small amount of metal from each cutting edge.

The report says to secure the drill bit in a vise with about a quarter-inch or less exposed, leaving the cutting end accessible. For freehand work, it advises holding the rotary tool in one hand and bracing the other hand—holding the tool wrist—against the vise. The operator then gently brings the grinding attachment to the bit, following the angle already present rather than trying to reshape the point from scratch.

Hunker describes two common point angles: 118 degrees for drilling wood, plastic and composite materials such as MDF and plywood, and 135 degrees as the most common angle for metal. The article says exact precision is not required for this task, but recommends approximating the bit’s intended angle and keeping its point centered. Both cutting edges should be ground, with only a small amount of metal removed.

For people who want more control than freehand sharpening offers, the report points to aftermarket jigs that hold or guide the bit and rotary tool. It says some attachments are designed to control the grinding angle, while some versions can be 3D-printed. Hunker also advises wearing eye protection and protective gloves because accidents can occur during grinding.

A Rotary Tool Can Replace a Grinder

The method could make routine bit maintenance more accessible to DIY users who have a rotary tool but no bench grinder. A sharp bit can make drilling tasks easier, according to Hunker, and the described approach uses a tool that may already be in a household workshop rather than requiring a separate sharpening machine.

That convenience depends on careful handling: the bit must be secured, the operator needs a stable hand brace, and both cutting edges must remain balanced around the center point. A jig may help guide the work, but the report does not establish that a Dremel attachment or freehand technique will restore every worn or damaged bit. The instructions are practical guidance, not a measured comparison of sharpening methods.

The Angles Behind the Method

Twist drill bits cut with two opposing edges at the point. Hunker’s angle guidance reflects common uses: 118-degree points are associated with wood, plastics and composites, while 135-degree points are commonly used for metal. The article’s main instruction is to preserve the angle already ground onto the bit, rather than treating those figures as exact targets for every sharpening session.

The report distinguishes freehand sharpening from using a jig. In the freehand method, the vise holds the bit while the user braces the tool hand to steady the grinding pass. Aftermarket fixtures can offer additional control over the position and angle. Hunker says Dremel does not appear to offer an attachment specifically for sharpening drill bits, while noting that the company has a separate dedicated machine for the task.

““You do not need to grind your bits to exactly those standards,” but should approximate the angles as you sharpen.”

— Hunker

Limits of the Sharpening Advice

The supplied report does not specify which Dremel grinding attachments to use, how fast to run the tool, or how to assess whether a bit has been sharpened evenly. It also does not provide test results comparing this method with a bench grinder or a dedicated sharpening machine. Hunker’s description does not establish that the procedure works for every drill-bit design, material or degree of damage; it addresses twist drill bits in particular.

The source also offers no detailed guidance on protective-glove type, bit temperature or how to handle a bit that is badly chipped or bent. Users should consult the instructions for their rotary tool and accessories, and should not assume the short how-to covers every safety or sharpening issue.

Check the Tool and Bit

Anyone considering the method should first confirm that the bit is a twist bit and that it can be held securely in a vise. Hunker’s next practical steps are to use eye protection and gloves, brace the rotary tool hand, follow the existing cutting angle and grind both edges lightly while keeping the point centered. A suitable jig is an option for users seeking more guidance than freehand control provides.

The report does not announce a new product or a formal test; it presents a workshop technique. No follow-up test or further development is specified in the supplied source, so the method’s results remain dependent on the user’s setup, skill and the condition of the bit.

Key Questions

Can a Dremel sharpen twist drill bits?

Hunker says a Dremel can be used to sharpen twist drill bits if the bit is secured and the user carefully grinds both cutting edges. The article does not claim the method suits every drill-bit type or condition.

What angles does the report recommend?

Hunker identifies 118 degrees as common for wood, plastic and composites, and 135 degrees as common for metal. It advises approximating the bit’s existing angle rather than insisting on an exact measurement.

How should the drill bit be held?

The report recommends clamping it in a vise with about a quarter-inch or less exposed. That leaves the cutting end accessible while securing the bit for grinding.

What safety precautions are mentioned?

Hunker advises wearing eye protection and protective gloves, securing the bit and bracing the tool hand against the vise. The report does not provide a complete safety manual, so users should also follow their tool and accessory instructions.

Source: rss