⚙️ Shear Sharpening Training: Sharpening Machines Module

Every professional sharpener must understand the tools of the trade. The two most common machines you’ll encounter are the Flat Hone and the Twice As Sharp system. Our Sharpening Machines Module provides a detailed comparison of these systems, including setup, operation, and their strengths and weaknesses for professional shear sharpening.

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What You’ll Learn in the Sharpening Machines Module

• Differences between Flat Hone and Twice As Sharp machines
• Machine setup and calibration for precision sharpening
• How each system interacts with convex, semi-convex, and beveled edges
• Operation techniques to maintain edge geometry and avoid damage
• Which system is better for beginners vs. advanced sharpeners

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Flat Hone Machines

Overview: Flat hone machines are the gold standard for convex edge shear sharpening. They use a rotating flat abrasive plate, allowing precise control of the angle and preservation of the shear’s natural radius.

Advantages:

• Preserves convex geometry without flattening
• Suitable for high-end Japanese shears
• Allows ultra-fine finishing and polishing

Limitations:

• Higher learning curve for beginners
• Slower than belt-based systems for heavy metal removal
• More expensive investment

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Twice As Sharp Machines

Overview: The Twice As Sharp system is a belt-driven sharpener with interchangeable wheels, commonly used for scissors and general sharpening. It is faster for material removal but less precise for convex geometry.

Advantages:

• Lower cost of entry
• Quicker for basic bevel sharpening
• Widely available replacement parts and wheels

Limitations:

• Can flatten convex edges if misused
• Less precise angle control
• Not ideal for premium salon shears

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Setup and Calibration

Proper machine setup is critical. In this module, you’ll learn:

• Flat Hone setup — selecting abrasive plates, aligning guides, and speed control
• Twice As Sharp setup — wheel selection, belt tracking, and tension adjustment
• Safety practices and workflow organization

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Operation Techniques

Using these machines effectively requires more than just switching them on. The Sharpening Machines Module teaches you:

• How to raise and remove a burr correctly
• Maintaining edge radius with the flat hone
• Controlled pressure application to prevent overheating
• Finishing and polishing for salon-ready shears

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Which Machine Should You Use?

Beginners: The Twice As Sharp is easier to start with but requires discipline to avoid damaging convex edges.

Advanced Sharpeners: The flat hone is essential for high-end professional work, especially on Japanese convex shears.

The Sharpening Machines Module walks you through choosing the right system for your workflow and mastering both.

Start the Sharpening Machines Module →

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FAQ

Which machine is better for convex shears?

The flat hone is the gold standard for convex edge sharpening, while the Twice As Sharp can damage the radius if not used carefully.

Can I use the Twice As Sharp for professional salon shears?

It can be used for bevel and semi-convex shears, but convex edges require flat hone precision.

Do I need both machines as a professional sharpener?

Many professionals use both: the Twice As Sharp for quick jobs or utility scissors, and the flat hone for high-end salon shears.