Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 31
  1. #21
    Gold Member
    Join Date
    Apr 2000
    Posts
    424
    Location
    Akaroa South Island ,New Zealand (about 1/2 way down south island)
    Tractor
    8350 valmet with 980SL FEL duels had a 150 Hp deutz just sold it 10 NOV 01

    Default Re: Sharpening Bush Hog

    Hi ya
    yep cracks and bent blades are best tossed and tossed in pairs if 2 of them .now as for angle i have seen some guys grind on about 30 degrees which even for a lawnmower is a bit flat a better grind is 45 and 60 45 base with a 60 finsh it leaves a thicker eage that will take knocks better .now as for the rounded ends if doing light bush and grass i'd say grind back square ya get a cleaner cut and use less power rounded the blade wants to slide off what ya cutting .as john said blades are cheep so ya could sharpen a set for rocky and thicker bush and use the newer one's on better ground ,from the ground i have done with a slasher i found the blades never got to the point of being sharpened as rocks broke them..another point someone come up with about grinding and the effect on steel it will make ya cutting eage softer witch is not a bad thing in stones ,alot of new blades are to hard and chip or brake instead of denting or bending
    catch ya
    JD Kid

  2. #22
    Veteran Member
    Join Date
    Jan 2002
    Posts
    1,492
    Location
    Lancaster PA
    Tractor
    Yanmar 186D

    Default Re: Sharpening Bush Hog

    Changed the blades today. I was all set for a major struggle. It went so smooth it frightened me. I didn't even have to get the 4 foot pipe out of the truck. Came right off with the 18" slider bar. The chinese sockets underwelm me. I think the nut is 1-5/8 but it wouldn't fit in the 1-5/8 socket. Had to use the 1-3/4 which was kind of loose. I made the nuts as tight as I could get them with the 20" ratchet. I don't have a way to measure how tight they are. Is that enough or should I go back and use some blue lock-tite?

    Chris

  3. #23

    Default Re: Sharpening Bush Hog

    How about 1 11/16...? {very popular}

    Use a pipe extension (24-36") and go a few more "inches of bar travel"... after about an hour of usage... tighten again with an extension... then check about every 10 hours of usage... {when you grease the loader...[img]/w3tcompact/icons/smile.gif[/img]}

    Good luck... [img]/w3tcompact/icons/wink.gif[/img]


  4. #24
    Platinum Member
    Join Date
    May 2001
    Posts
    919
    Location
    QC, Canada
    Tractor
    B7500HSD

    Default Re: Sharpening Bush Hog

    You used the words bush hog to describe your cutter - I assume it is a Bush Hog brand. My manual lists the bolts as either 1-5/16" or 1-11/16". I suspect yours were 1-11/16."

    The torque spec is 300ft./lbs for the 1-5/16 and 450ft./lbs for the 1-11/16. That's a lot of torque - more than most consumer-grade air impact guns. I'd need to "feel" how tight that is before guesstimating. I don't think you could over-tighten them by going as hard as you can without a pipe on the end of your wrench/ratchet.


    **looks like JMIII beat me to it.

  5. #25
    Member
    Join Date
    Nov 2001
    Posts
    38
    Location
    Thomaston, CT
    Tractor
    2004 JD X575

    Default Re: Sharpening Bush Hog

    Hi John,

    <font color=blue>they recomend replacement versus "re-sharpening"... due to the "tempered" and "hard-surface process" technology in use now...

    <font color=black>Another reason to replace this style blade more often than a finish mower type is due to the "pounding" the blades are subject to in mowing brush, trees, rocks, etc. This "pounding" will have a "work hardening" effect on the blades, which will make them more likley to break.

    The "hard-surface process" you mention has been around for a very long time in the form of "case-hardening". Although with todays technologies there are different methods of achieving this, what these processes do is "harden" the outer skin of whatever, and toughen the core.

    In the case of Rotary Cutter Blades, sharpening eventually will grind off this hardened steel, exposing the softer core material. But - this core material stands a good chance of being in a "work-Hard" condition, this will "stiffen" the blade making it subject to fracture.

    Oh- John, thank you for remaining "unregestered" my PC is most grateful !![img]/w3tcompact/icons/wink.gif[/img].

    Mike


  6. #26
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    38,010
    Location
    Texas

    Default Re: Sharpening Bush Hog

    Chris, if you got them as tight as the specs call for with a 20" ratchet, you're stronger than I am and have a tougher than normal ratchet.[img]/w3tcompact/icons/wink.gif[/img] I suspect that you got them tight enough to not have a problem, but I don't think I'd want to risk it.

  7. #27

    Default Re: Sharpening Bush Hog

    <font color=blue>...20" ratchet,...</font color=blue>

    Thanks Bird... you're a great proof reader... [img]/w3tcompact/icons/smile.gif[/img]
    ________

    Chris...

    I missed the "ratchet" part... even though it's a deluxe Taiwanese 3/4" socket set... (busting chops now...[img]/w3tcompact/icons/wink.gif[/img]), I'd use a "breaker bar" with pipe extension...

    The blade bolts will be grade 8, about 1 1/8" and will handle up to 1200-1500 ft. lbs. of torque...{if that rachet handles that, I'll buy a few sets...[img]/w3tcompact/icons/blush.gif[/img]}

    The main thing you want to look out for after you torque down the bolts... is to still have the blades "swing" and not be "torqued" too tight into a fixed/non-moveable position... [img]/w3tcompact/icons/frown.gif[/img]


  8. #28
    Gold Member
    Join Date
    Jan 2002
    Posts
    296
    Location
    tulsa ok
    Tractor
    kubota l3010hst/ford 601 workhorse

    Default Re: Sharpening Bush Hog

    Dang, I want to thank all of you for this enlightening post. My the father-inlaw has been reading this post and admitted he has owned his brushog(unknown make) for 18 years and the blades have never been removed or sharpened. I looked at his blades yesterday and surprisingly they still have a cutting edge(really dull) and are not bent. He uses this thing about 4-6 times a year and takes out everything up to 3", I guess they just don't make blades like they used too

  9. #29

    Default Re: Sharpening Bush Hog



    Question-How do I torque down a bolt @ 1400 foot lbs. with only using a 100 ft. lb. torque wrench...?

    <A target="_blank" HREF=http://www.specialpatrolgroup.co.uk/spooky/torque/torque.html>AnswerA Unique Approach To Torque Wrench Multiply/Extensions &amp; Torque Formula's</A>


  10. #30

    Join Date
    Feb 2001
    Posts
    470
    Location
    Lyndeborough, NH
    Tractor
    Kubota L5030HSTC, Farmall SuperC

    Default Re: Sharpening Bush Hog

    Great article John - thanks! Makes much more sense to me then the costly torque multipliers one occaisionally sees.

Page 3 of 4 FirstFirst 1234 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.