How often should I sharpen woodchipper blades?

For typical property use: once a year, or every 20–40 hours of runtime. Heavy hardwood users and anyone chipping dirty/stumpy wood should sharpen twice a year.

Can I sharpen chipper blades with a file?

Not really. Chipper blades use hardened tool steel that quickly dulls files. A belt sander or bench grinder is the minimum; professional service uses blade-grinding equipment with controlled coolant.

What's the blade angle on a Woodmaxx chipper?

Most Woodmaxx blades are factory-ground at 35–40 degrees. Check the specific model manual — angles can vary between the WM-Series and MX-Series.

Does a chipper need an anvil or bed knife too?

Yes — drum-style chippers use a fixed anvil or bed knife opposite the flywheel blades. These need periodic replacement too (typically every 2–3 blade sharpenings). They’re cheaper than the flywheel blades, ~$20–$50.

How many times can you sharpen a chipper blade before replacing it?

Typically 4–6 times, depending on how much material you remove each sharpening. Once the blade edge has been ground back to less than 75% of its original width, it won’t hold an edge reliably and should be replaced.

Can you use aftermarket blades in a Woodmaxx or MechMaxx chipper?

Sometimes. Aftermarket blades are available for popular models, but you must match the exact dimensions, bolt pattern, and thickness. Poorly-fitted aftermarket blades can cause dangerous flywheel imbalance. When in doubt, buy OEM.

Do all chipper brands use the same blade steel?

No. Higher-end chippers (Wallenstein BX72S, Woodmaxx MX-Series) typically use harder tool steel that holds an edge longer but is more difficult to sharpen. Budget models use softer steel that dulls faster but is easier to resharpen at home.

What sharpening angle should I use for Woodmaxx blades specifically?

Woodmaxx WM-Series blades are factory-ground at approximately 35–37 degrees. MX-Series blades run closer to 38–40 degrees. Match the existing bevel angle when sharpening — changing the angle alters chip geometry and can increase stress on the anvil.

Buying guide

Woodchipper blade sharpening guide

Sharp blades save HP, save fuel, and produce better chips. Here's how to know when to sharpen, how to do it yourself, and when to send them out.

By Daniel AshfordUpdated April 22, 2026

Blade sharpness is the single biggest variable in chipper performance. A chipper with dull blades at capacity feels underpowered. The same chipper with fresh blades feels like it jumped a full HP tier. Whether you own a compact MechMaxx GS650 or a full-size Woodmaxx MX-8800, blade maintenance is the one thing that determines whether your chipper performs to spec or limps through every session.

When to sharpen

The three signs:

Feed rate slows on branches you were handling fine last session.
Chips get stringier and fuzzier instead of crisp and blocky.
The chipper bogs on material it used to handle.

For typical property use (20–40 hours per year), sharpening once a year is the baseline. Heavy hardwood use cuts that in half. Chipping wet or green wood is actually gentler on blades than dry seasoned wood, so you may get more time between sharpenings if most of your material is fresh.

How to sharpen (DIY)

Remove blades. Disconnect power/PTO. Most chipper blades are 2-bolt mounts on the flywheel. Keep bolts and washers organized.
Degrease. Pitch and sap accumulate on blade faces and make sharpening harder. Wipe clean with mineral spirits.
Sharpen the primary bevel.Most chipper blades use a 30–40° bevel. A belt sander with a 60-grit belt works well. Keep the angle consistent and quench frequently to avoid bluing.
Maintain blade balance. Remove equal material from each blade in a matched set. Unbalanced blades vibrate the flywheel and destroy bearings.
Torque to spec. Use a torque wrench. Under-torqued blades come loose; over-torqued blades can crack the mounting holes.

When to send them out

Send blades out for professional sharpening if: you don’t have a belt sander or blade-grinding setup, the blades have deep nicks from hitting metal or stone, or you need them reground to a specific factory angle. Cost is typically $15–$35 per blade at a saw/blade shop. Most mail-order sharpening services charge $40–$80 for a full set including return shipping.

When to replace instead of sharpen

Chipper blades are a consumable. Replace rather than sharpen when: the cutting edge is shorter than 75% of original length, there are cracks near the mounting holes, or you’ve hit metal and there are chips more than 1/16 inch deep. A new set of blades for most 6–8 inch chippers runs $80–$180. See the cost table below for brand-specific pricing.

Signs you need new blades vs just sharpening

Not every dull blade needs replacing. Here’s how to tell the difference:

Chip quality degraded but edge looks intact:sharpen. The bevel has rounded from use but there’s plenty of steel left to work with.
Visible nicks or chips in the cutting edge:if nicks are shallow (under 1/32″), you can grind past them with one sharpening. Deeper nicks mean replacement.
Edge has been sharpened back to less than 75% of original width: replace. The blade is running out of steel and won’t hold an edge much longer.
Cracks near bolt holes or along the body: replace immediately. A cracked blade can shatter at flywheel speed.
One blade in the set is worse than the others: replace the full set. Mismatched blades cause flywheel imbalance and uneven wear.

Blade replacement costs by brand

Replacement blade costs vary by brand and model. Here are approximate costs for a full blade set (2–4 blades depending on model):

Brand / Series	Blade set cost (approx.)	Notes
Woodmaxx WM-Series	$80–$120	2-blade sets; available direct from Woodmaxx
Woodmaxx MX-Series	$120–$180	Heavier blades; 4-bolt mount on larger models
Woodland Mills	$100–$160	Good parts availability; order direct
Wallenstein	$140–$220	Dealer-sourced; higher-grade steel on BX72S+
MechMaxx	$80–$140	Amazon-available; fits GS650, B150, DCH7

Prices are approximate 2026 retail. Always confirm part numbers with your model’s manual before ordering.

FAQ08 questions

Frequently asked questions

How often should I sharpen woodchipper blades?: For typical property use: once a year, or every 20–40 hours of runtime. Heavy hardwood users and anyone chipping dirty/stumpy wood should sharpen twice a year.
Can I sharpen chipper blades with a file?: Not really. Chipper blades use hardened tool steel that quickly dulls files. A belt sander or bench grinder is the minimum; professional service uses blade-grinding equipment with controlled coolant.
What's the blade angle on a Woodmaxx chipper?: Most Woodmaxx blades are factory-ground at 35–40 degrees. Check the specific model manual — angles can vary between the WM-Series and MX-Series.
Does a chipper need an anvil or bed knife too?: Yes — drum-style chippers use a fixed anvil or bed knife opposite the flywheel blades. These need periodic replacement too (typically every 2–3 blade sharpenings). They’re cheaper than the flywheel blades, ~$20–$50.
How many times can you sharpen a chipper blade before replacing it?: Typically 4–6 times, depending on how much material you remove each sharpening. Once the blade edge has been ground back to less than 75% of its original width, it won’t hold an edge reliably and should be replaced.
Can you use aftermarket blades in a Woodmaxx or MechMaxx chipper?: Sometimes. Aftermarket blades are available for popular models, but you must match the exact dimensions, bolt pattern, and thickness. Poorly-fitted aftermarket blades can cause dangerous flywheel imbalance. When in doubt, buy OEM.
Do all chipper brands use the same blade steel?: No. Higher-end chippers (Wallenstein BX72S, Woodmaxx MX-Series) typically use harder tool steel that holds an edge longer but is more difficult to sharpen. Budget models use softer steel that dulls faster but is easier to resharpen at home.
What sharpening angle should I use for Woodmaxx blades specifically?: Woodmaxx WM-Series blades are factory-ground at approximately 35–37 degrees. MX-Series blades run closer to 38–40 degrees. Match the existing bevel angle when sharpening — changing the angle alters chip geometry and can increase stress on the anvil.