Chipper blade uneven wear

[Husqvarna King]

I bought a low hour timberwolf 125 from orange plant last year.

I haven't done many hours on it yet but change the blades much sooner than recommended to keep the machine in good condition.

Each time the edge of the outer blade has been badly worn with the rest of the blade and other inside blade being in good condition. I have run my finger along anvils and last time took off a very small bur, this time it had still done the same, any ideas? It chips very well and I can't hear anything when I turn the flywheel by hand

Edited May 16, 2020 by Husqvarna King

[Mick Dempsey]

Take the belts off the pulley so you can spin the flywheel freely, then you can see if it’s kissing the anvil.
 

To me, that looks like fairly normal wear, perhaps a bit of fencing or something went through it, even the most careful of us cannot check everything that goes through.

 

How many hours had those blades done?

[Husqvarna King]

Blades had done about 10 hours, the inside blade was fine and good edge on main part of blad in photo. That's the 4th set to have worn exactly the same way right on the outer edge of flywheel. Will whip the belts off next week and have a look/listen. Cheers

[Mick Dempsey]

@Pete B @Jase hutch might have a theory.

[htb]

Also check the holders the blades bolt to are tight as IIRC they are bolted to the flywheel. Did you clean the seats the blades sit in before fitting the new ones and what torque setting as I think its 45ft/Lb.

As mick said spinning flywheel with belts will show up any failing bearing or fouling on anvil.

I cant remember what clearance there should be btw blade and anvil, off the top of my head its something like 3-4mm.

[Husqvarna King]

8 minutes ago, htb said:

Also check the holders the blades bolt to are tight as IIRC they are bolted to the flywheel. Did you clean the seats the blades sit in before fitting the new ones and what torque setting as I think its 45ft/Lb.

As mick said spinning flywheel with belts will show up any failing bearing or fouling on anvil.

I cant remember what clearance there should be btw blade and anvil, off the top of my head its something like 3-4mm.

I always clean off before fitting new blades yes but I haven't checked if the blade pockets are tight, do these have a torque? I always torque the blades ?

[htb]

They will have a torque setting, but I have never checked them. @Timberwolf Official

[monkeybusiness]

All chippers wear one side of the blades faster than the rest ime - it depends on which part of the knife is presented with material first on each pass. The knives don’t cut dead square against the anvil (it needs a lot less power to cut like scissors whereby the cut moves across the bed-knife than it would to try and force the entire knife edge through the material and across the anvil all at exactly the same time). 
There is a lot more to flywheel design and knife layout than laymen like us would consider. 
Bandit (and others) present the material at 45 degrees to the flywheel to aid cutting - my Bandit chipper only seems to wear the inner knives, even when feeding at full capacity. 
My Greenmech chippers wear the inner disks much faster than the outers.

Whenever you replace an anvil they never have even wear - one side rounds off a lot more than the other - it’s exactly the same with blades (only faster!). 

[monkeybusiness]

The only time I ever torqued blades to manufacturers spec they came loose and caused a lot of damage... I always tighten them until I fart now!