How Do I Know When My Blades Need Sharpening?
- RMC Sharpening
- Jul 11, 2024
- 3 min read

Welcome to the RMC Sharpeners blog! Whether you're using thinning scissors, lawn mower blades, kitchen knives, or dog grooming cutters, keeping your blades sharp is essential for optimal performance and longevity. Here are some key signs that it’s time to sharpen your blades:
1. Uneven or Ineffective Cutting
For kitchen knives, a clear sign that they need sharpening is when they start squashing tomatoes instead of slicing through them smoothly!
You might also notice that you need to apply more pressure than usual or that the knife slips off the food, which indicates dullness. Similarly, if your lawn mower is leaving uneven patches on your lawn, it’s because the blades are tearing the grass rather than cutting it cleanly, making the mowing process longer and less efficient.
2. Visible Damage
It's important to regularly inspect your blades for any visible nicks, dents, or bends. Damage like this compromises the efficiency and safety of the tool.
For instance, a bent or nicked lawn mower blade not only affects the quality of the cut but also poses a safety hazard, necessitating either sharpening or replacement.
3. Increased Effort
When it comes to kitchen knives and scissors, dull blades make chopping, slicing, or cutting feel more laborious than it should be. You should not have to exert excessive force for routine tasks.
Similarly, if mowing feels more strenuous and you find yourself needing to push harder, it’s a sign that your lawn mower blades are dull and need sharpening.

4. Poor Performance
For groomers, dull blades can lead to uneven cuts and discomfort for pets, indicating that your dog grooming cutters need sharpening.
Thinning scissors that pull or tug at the hair instead of cutting it cleanly also need attention. Ensuring your grooming tools are sharp will provide a smoother and more efficient grooming session.
5. Frequent Stalling or Malfunctioning
If your lawn mower frequently stalls, especially when cutting through thick grass, it could be due to dull blades. This forces the engine to work harder, potentially causing damage over time. Ensuring the blades are sharp can help the mower run smoothly and reduce the likelihood of stalling.
After mowing, inspect the grass tips. If they appear jagged and torn rather than cleanly cut, it’s a clear indication that the mower blade is dull. This can lead to brown, unhealthy grass, as torn grass blades are more susceptible to disease and dehydration.
How Often Should Blades Be Sharpened?
Kitchen knives should be sharpened every few months, depending on use, with regular honing extending the time between sharpening sessions. Lawn mower blades should ideally be sharpened after every 20-25 hours of use, which for most homeowners translates to once or twice per mowing season.
Dog grooming cutters and thinning scissors should also be sharpened regularly based on usage frequency and performance needs.

Conclusion
Regular maintenance and timely sharpening of your blades ensure they perform their best, save you time, and make your tasks easier and safer. At RMC Sharpening, we are dedicated to keeping your tools in top condition. If you notice any of these signs, book with us for a professional sharpening service.
For more tips on blade maintenance or to schedule a sharpening session, visit our website or contact us directly.
07900 928 128
Keep your blades sharp and your work efficient with RMC Sharpeners!
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