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Wood Chipper Blades

picked up a 50 year old Sears Shredder and Bagger. 3.5 HP. Little fucker is in great shape. Ran some Seafoam in ethanol free fuel trough it which cleared up carburation issues and runs great for an engine i thought would need at least a carb rebuild when i bought it.

after 4-5 hours of using it, i've decided the blades are worn beyond serviceability and need replaced. looking for replacement blades is quite likely pointless so i'm not going to even bother trying.

this things has a stack of 3 what look like small lawn mower blades.

what steel would you make the blades from? i could go with A2 or D2 tool steel heat treated to somewhere in the RC 50-60 hardness range. or even M2 steel if i wanted to mulch metal fence posts, though the housing around the blades may not be quite up to the task.

would pre hard 4140 be a decent choice? or would just some 1018 crs be suffice for chopping up small yard brush and leaves?

Reply to
fos
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They are an odd shaped mower blade. If they look anything at all like this image I would try sharpening them first:

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And the part number "658A30" which wasn't expensive seems to be obsolete:

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Those slotted side pieces that the blades spin thru in the above diagram should be in reasonable condition too.

I would check out Edger blades and see if any are the same length and have a mounting hole you can work with. It would be a good material to use for making newish blades...

Reply to
Leon Fisk

How about a quick hardface and 40 degree sharpening?

Reply to
wws

it's been decades since i've had access to spray welding equipment and i've sold my stick welder since then too. completely slipped my mind. i know a great fabrication shop that can do hardfacing for me. thanks for jogging my memory. this is the way to go. especially since the manual calls the stack of blades a weldment which implies it's quite a bit of work to replace the blades. if it's even possible. may have to build a whole new assembly. thanks again.

Reply to
fos

You're welcome. I'm on a tear, recently screwed a seatbelt bolt through my string trimmer bump knob. Figure I can bump it for years without a replacement.

Reply to
wws

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