SB1 Sharpening Stone Set, Double Sided Diamond Whetstone Kit

How should a new SB1 diamond stone feel when I first use it?

A newly manufactured SB1 may feel sharper and more assertive than you expected, even if the grit rating suggests a refined finish. This occurs because, during production, a small number of diamond particles sit marginally higher than the majority that are securely bonded into the nickel layer. Early sharpening naturally removes these higher points. During this brief conditioning phase, the stone can feel very fast-cutting. After several sessions, the surface evens out and delivers a stable, predictable sharpening response consistent with its grit rating.

What Type of Diamond: Monocrystalline or Polycrystalline?

The SB1 Diamond Stone uses premium monocrystalline diamond.

Monocrystalline particles are single-crystal diamonds, so each grain tends to be tougher and more durable under pressure. That means the cutting points stay effective for longer, the stone remains consistent over time, and the sharpening feel is more predictable across many sessions.

Polycrystalline diamonds are made from bonded micro-crystals. They can break down more readily and shed fragments, which may create fresh sharp edges, but they generally wear faster and can become less consistent as the abrasive structure fractures.

For that reason, monocrystalline diamond is widely preferred for long-life, stable performance and dependable results — exactly what the SB1 is designed to deliver.

Why am I seeing occasional scratch lines on my finer surface?

Light scratch marks are normally the result of grit migration. When moving from a coarser abrasive to a finer one, loose particles can remain on the blade edge. If not wiped away, those particles can score the finer surface during the next pass. These marks do not compromise flatness, lifespan, or performance. Cleaning the tool between grit changes eliminates the issue.

What determines the lifespan of the SB1?

The SB1 is engineered for consistent edge maintenance under controlled use. Diamond abrasion gradually wears the working surface over time. Longevity depends primarily on technique — steady strokes, light pressure, and proper lubrication significantly extend service life. The stone is designed to maintain reliable performance over many sharpening cycles when used correctly.

Will pressing harder make the SB1 cut faster?

No. Sharpening efficiency comes from diamond hardness and surface contact, not downward force. Applying excess pressure can stress the nickel bond without increasing cutting speed. Allow the abrasive surface to perform the work. A controlled, moderate touch produces the most efficient results.

How accurate is the flatness of the SB1?

Each SB1 is produced and verified to ±0.00175″ (±0.045 mm), measured diagonally across the working face. This ensures dependable flatness for precise edge work and reference sharpening.

Should I clear swarf during sharpening?

Yes — especially during longer sessions. As material is removed from the tool, microscopic steel particles accumulate on the surface. If this residue builds up, cutting performance can gradually decrease. Using the cleaning block on a dry plate restores surface efficiency and maintains consistent sharpening action.

Is lubrication necessary with the SB1?

The SB1 will operate dry, but lubrication improves control and cutting consistency. A low-viscosity lapping fluid keeps metal particles suspended and reduces surface loading. Thicker oils may reduce efficiency by increasing drag. Water is acceptable but requires thorough drying before storage. For the most consistent results, use a dedicated lapping fluid.

Can the SB1 sharpen ceramic tools?

Yes. Diamond abrasives are significantly harder than ceramic and are well suited to sharpening ceramic knives.

Does the SB1 require flattening?

No. Unlike traditional whetstones, diamond plates maintain their flatness and do not dish with use. They are frequently used to true other sharpening stones.

What role does the surface pattern play?

The SB1’s surface geometry helps manage debris and lubricant movement during sharpening. The patterned surface encourages swarf-laden fluid to move away from the immediate cutting area, helping maintain consistent contact between tool and abrasive.

Is the SB1 suitable for heavy reshaping work?

The SB1 is optimised for controlled edge refinement and maintenance. While it is capable of removing larger amounts of material, significant reshaping or altering of primary bevels is more efficiently performed using powered grinding systems. Using a bench stone for major stock removal is slower and will accelerate wear.

What lubricant is recommended?

Oil is generally too viscous for optimal diamond abrasion. Water performs better but requires careful drying after use. A purpose-formulated lapping fluid provides low viscosity, improved cutting efficiency, and enhanced corrosion resistance. M.POWER’s water-based synthetic formula contains no nitrates, mineral oils, sulphur, chlorine, or phenol, helping reduce corrosion risk and skin irritation.

How should I maintain the SB1 after use?

After sharpening: remove excess lubricant; clear surface residue using the cleaning block; if necessary, rinse and gently brush with mild detergent or lapping fluid; dry completely before storage. Avoid leaving the stone damp or coated in swarf.

Tool Safety

Sharpening involves inherently sharp tools. The SB1 should only be used by individuals with appropriate skill, experience, and understanding of safe sharpening practices.