How to Tell When Your Chainsaw Chain Needs Sharpening
Emily LeechHow to Tell When Your Chainsaw Chain Needs Sharpening
Introduction
A blunt chainsaw chain doesn't just slow you down—it makes your chainsaw work harder, increases fuel consumption, puts more strain on the guide bar and clutch, and can even become a safety issue.
The good news is that your chainsaw gives you plenty of warning before the chain becomes completely blunt. Knowing what to look for can help you sharpen your chain at the right time, improving cutting performance and extending the life of your chain.
1. Watch the Wood Chips
This is the single best indicator.
When a chainsaw chain is brand new or freshly sharpened, it should produce large, well-defined wood chips.
As the cutting edge begins to wear, those chips gradually become smaller.
Eventually, instead of producing chips, the chain starts producing fine sawdust.
While sawdust is the easiest sign to recognise, it's actually a sign you've waited a little too long.
Ideally, you should sharpen your chain while it's still producing smaller chips, before it reaches the stage where it's only making dust.
Why Chip Size Changes
One of the biggest misconceptions is that the cutter does all the work.
In reality, every cutter consists of two parts working together:
- The cutter tooth
- The depth gauge (also called the raker)
The distance between the top of the cutter and the top of the depth gauge determines how large a wood chip the chain removes on each pass.
As the cutter is sharpened over time, it becomes lower.
If the depth gauge isn't lowered as well, the gap between the two becomes smaller.
That means the cutter can only take a smaller bite from the timber, producing smaller chips and making the saw cut noticeably slower.
A properly maintained chain requires both the cutter and the depth gauge to be maintained throughout its life.
Graphic: Side profile showing the cutter and depth gauge with arrows illustrating the chip thickness.
2. The Chainsaw Starts Producing Fine Sawdust
Fine sawdust is one of the easiest signs to recognise.
Instead of throwing healthy chips, the chain begins producing powder-like dust.
By this stage, the cutting edge has usually become quite dull and it's time to stop and sharpen the chain before continuing.
3. Smoke Appears While Cutting
A smoking cut doesn't always mean the chain is blunt.
Other causes can include:
- Poor chain lubrication
- Incorrect chain tension
- A worn guide bar
However, a blunt chain creates far more friction than a sharp one, making smoke much more likely.
If you notice smoke while cutting, stop immediately and inspect the entire cutting attachment before continuing.
4. Use Refuelling as Your Sharpening Reminder
One of the simplest habits you can develop is sharpening your chain whenever your chainsaw runs out of fuel—or whenever your battery needs recharging.
Even if the chain isn't yet producing dust, this is an ideal time to inspect it and give it a quick sharpen if needed.
Building sharpening into your normal refuelling or charging routine helps maintain consistent cutting performance and prevents the chain becoming excessively blunt.
Common Mistakes
Waiting Until It Won't Cut
Many people continue cutting until the chain is producing nothing but dust.
By this stage, the chainsaw has been working much harder than necessary.
Sharpening earlier saves time, reduces strain on the saw and makes the sharpening job quicker.
Only Sharpening the Cutter
A sharp cutter with an incorrectly set depth gauge won't perform as it should.
Both components work together and should be maintained throughout the life of the chain.
Continuing to Cut With a Smoking Chain
Heat is one of the biggest enemies of your cutting attachment.
Ignoring smoke can damage not only the chain, but also the guide bar and drive sprocket.
Frequently Asked Questions
How often should I sharpen my chainsaw chain?
There isn't a fixed number of tanks or batteries. It depends on the timber you're cutting, whether it's green or dry, and whether the chain contacts dirt, bark or other contaminants. The condition of the chips is a much better indicator than elapsed time.
Can I keep cutting if it's only making a little dust?
You can, but it's not recommended. The chain is already losing efficiency and the saw is working harder than it needs to.
Should I lower the depth gauges every time I sharpen?
Not necessarily. The depth gauges should be checked regularly with the correct depth gauge tool and lowered only when required. Removing too much material can make the chain overly aggressive, increase vibration, and reduce safety.