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Thread: New Cutting edge required

  1. #1
    Join Date
    Mar 2004
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    kamloops bc canada
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    168

    Default New Cutting edge required

    I just picked up a mini-excavator with a worn out dozer blade on it. It is worn out right down to the frog. I'm planning to replace or repair the cutting edge one of these days, and have been keeping my eyes open for some suitable material.



    Question: has anyone done this type of repair? What would you recommend as to the type of steel to use. My neighbour said to cut a flange off a rail, or look for a used grader blade. I've had success using old leaf springs for rebuilding the "flat" part of a bucket on a front end loader, but never tried to repair the "vertical" like this one.

    Any ideas would be most welcome.

  2. #2

    Default

    Ive done a couple edges on buckets and we used AR400 plate, AR200(AR Medium) will work too but won't last as long as the 400
    Experience is something you don't get until just after you need it. ..

  3. #3
    Join Date
    Dec 2004
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    where the Snake swallows the Salmon
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    Default

    AR plate seems to be pretty standard.

    Dunno about mini-excavators, but for snow plows, there are several companies that sell replacement edges made of AR. Usually less than $100. Normally they bolt on. If you can't find an edge especially for your blade, you could buy a standard edge, trim it to length, and weld it on.

    Or, weld on a mild steel backer with holes to accept a bolt-on wear edge.

  4. #4
    Join Date
    May 2009
    Posts
    157

    Default

    Quote Originally Posted by Errol
    My neighbour said to cut a flange off a rail, or look for a used grader blade.
    That's my first thought. Worn bars from a big machine could make a couple for yours. Are you near a good scrap yard? Or maybe visit excavators in your area.

  5. #5
    Join Date
    Dec 2007
    Location
    northwest wisconsin
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    1,175

    Default

    my local government shop (county here in wisconsin) changes blades every year. they come and borrow my air hammer to blow the bolts back out. i got a 8 footer off the grader a few y ears ago. just for asking.

  6. #6
    Join Date
    Dec 2008
    Location
    N/W Pa.
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    277

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    Errol , used bolt on cutting edges from graders or dozers will work but I have seen the welds crack over time . If you have a heavy equipment dealer near you could get the correct size and type of material by taking the the model number of the excavator in and seeing if they can order you one . I have bought a couple of them from a local dealer , one was a stock bolt on and the other was a weldable edge from a piece of equipment they sell . They will also order custom cut AR400 plate edges . Their prices have been competitive with ordering off the internet . JMTC , Dan

  7. #7
    Join Date
    Mar 2004
    Location
    kamloops bc canada
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    168

    Default

    Thank you all for your help and turning me in the right direction. I certainly wanted something with abrasion resistance so looks like AR 400 is what i am looking for.

    Good idea to ask for availability at the excavator dealer. That is what I will be doing next week. Using old grader blade is also appealing, but I'm not confident I would have success at welding thick grader blade material onto the existing frog.

    The original cutting edge (or what's left of it) appears only 7/16 or 1/2 inch thickness, and the frog looks like is only 3/6 or 1/4" material. I'll keep you posted on how it goes.

  8. #8
    Join Date
    Jun 2005
    Location
    Alberta
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    Default

    I would try your local farm supply, they likely have lighter edges more suited to your needs for tractor blades. Not sure now you have purchased it how much use the dozer portion of the excavator you'll need.......only you can answer that, trenching requires lots of use, digging ponds not as much.

    Grader blades generally have the bolt holes offset for one usage, bulldozers are centered and can be flipped around, both are bolt on. I was fortunate enough to pick up some brand new grader cutting edges from the municipal district as they had previous new stock and switched grader brands and the new pattern didn't cross over........I'm building a 12' grader blade as a project but it's currently taking a haitus........LOL

    AR400 is generally used for the plate and skins, the cutting edges are harder.
    Opportunity knocks once, temptation leans on the doorbell.....

  9. #9
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    Dec 2003
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    Regina and Assiniboia, Saskatchewan
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    Default

    Hey Errol! How's it goin?
    Yep...for a home use machine...get an old grader blade.
    Or a cutting edge that is cut off a bigger bucket etc.
    OR...go to a place like Wilkinson Steel and see if they have any narrow strips of T&Q 425 or T&Q 500. I work with this stuff all the time and can vouch for its toughness.
    OR...go to a bolt house or whatever will carry smallish things like that...often they will stock cutting edges.
    They always have an older one that won;t fit or whatever... I got my cutting edge from an outfit like that. Not much money either..
    ...LOL!
    Russ
    Last edited by torker; 06-20-2009 at 12:14 AM.
    I have tools I don't even know I own...

  10. #10
    Join Date
    Mar 2004
    Location
    kamloops bc canada
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    Default

    Russ, good to hear from ya. Going good here. Last week, I made progress on my project. I scrounged around town, and found a piece of 1/2 x 3 1/2" AR plate for $70.

    Now I have hauled the excavator back home. My plan is to (next week)torch off the sliver of old blade and then weld on the new AR.

    This will be fun welding. Not often I can "twist the throttle" on the welder, since most of my welding jobs are thin material, spending most of my welding time worrying about not blowing through.

    Will keep all of you posted.

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