Anyone here got any idea as to why this may have happened?

[Coletti]

Had a job clearing thorn, elder and connie yesterday and didnt really chip anything above 4-4.5" and when I checked the machine over after I was finished I found I had cracked a blade , can't see that any metal/stone has been through it as there is no chip in the blade...just wear and tare?

 

 

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[treequip]

Was the blade bed clean when the blade was installed?

 

A bit of unevenness will crack a blade

[Stubby]

Had a job clearing thorn, elder and[ATTACH]130757[/ATTACH] connie yesterday and didnt really chip anything above 4-4.5" and when I checked the machine over after I was finished I found I had cracked a blade , can't see that any metal/stone has been through it as there is no chip in the blade...just wear and tare?

 

 

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In correct heat treatment ? Looks as though it could be from over torque on the bolts . Did you use a torque wrench to tighten ? Still could be not enough tempering back from initial hardening . If you have access to a rockwell hardness tester get them checked out to see if they are harder than spec . Harder = more brittle .

[NoRush]

Could be a fault in the steel. Is it new

[Stubby]

Was the blade bed clean when the blade was installed?

 

A bit of unevenness will crack a blade

 

Thats more likely treequip good answer bud

[Coletti]

It isn't no and I didn't as I'm not sure what the correct torque setting is. Shall try and find that out though

 

 

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[Pat Ferrett]

What machine is it and how many re grinds has the blade had. Any previous damage that was ground out that could have started the crack.

I had 3 sets of blades do the same a few years back all brand new and all within a few hours of use, in the end I had an engineer make me 5 sets and he annealed them properly and never had another problem.

[jaime bray]

Was the blade bed clean when the blade was installed?

 

A bit of unevenness will crack a blade

 

Had a tiny fragment of sawdust behinds blade once when left someone to change my blades, cracked it good and proper.

 

Danger of trying to clean out blade edge thingy to much is you carve a groove into it. At least those that owned my chipper prior to me did.

 

Wire brush and a compressor blow out. Then wipe down blade with clean rag, wearing gloves, safety goggles and steel toecap boots to protect yourself. Lol. Just covering my back. Lol.

[combined tree services]

were the blades genuine main dealer blades ?

[Coletti]

The blade bed was cleaned using a bit of sand paper and a brush when I turned them around not long ago although I did notice a bit of surface rust on the underside of the blade that could have lifted it? The machine is a jo beau m500 and I'm unsure as to how many grinds the blades have had as I bought it second hand

 

 

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