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cutting edge

Discussion in 'Fisher Engineering Discussion' started by racin84, Dec 29, 2007.

  1. racin84

    racin84 Junior Member
    from CT
    Messages: 13

    Posted this in the "new to industry"section and only got a sarcastic answer, perhaps people here are more professional...replaced my old truck/meyers combo with an '89 GMC 1 ton and fisher 9' blade. Obviously everything is used equipment. Question is: when do you replace the cutting edge on a fisher. On the old meyers it wasn't as critical to me due to the difference in blade trip vs. just a tripping edge. Currently there is 5 1/2" of cutting edge on the fisher, but the bottom of the cutting edge is flush with the trip assy. Even appears trip assy may have some actual wear to it. Called a local fisher dealer and he told me to wear it down to 4". Seems like that will cause serious damage to trip assy. Was also told new trip edge is only 6" to start. How far below trip assy should a new cutting edge extend?
     
  2. JPMAKO

    JPMAKO Senior Member
    Messages: 660

    Your dealer was right the actual part that trips is called the base angle and it needs to be worn down before a cutting edge is installed. Take off the cutting edge and let the base angle wear down for the rest of the season. Next year install the cutting edge or get a new one. Just make sure that you don't wear down the base angle too far. ;)

    Jason
     
  3. tkrepairs

    tkrepairs Senior Member
    from maine
    Messages: 186

    are the cutting edges reversible too? maybe you wear an inch off one side then flip it and wear the other inch off that side? and yes the base angle needs to be worn, but being a used setup maybe its already worn. can you see how much is left?
     
  4. BlueLine Ent

    BlueLine Ent Senior Member
    Messages: 570

    I'm not 100% positive, but I believe its the MC series cutting edges that are reversible. I know my 9' MC is.
     
  5. racin84

    racin84 Junior Member
    from CT
    Messages: 13

    The cutting edge is not reversible. Bolts are all at top edge. Are there any sites that have good exploded views of older Fisher plows so I can ID the exact model I have? Thanks for the help.
     
  6. Buster F

    Buster F Senior Member
    Messages: 208

    Leave the cutting edge on your blade and wear both it and the base angle to a point that the spring tabs are almost hitting the pavement. Be sure not to let the tabs hit and wear themselves to the bolts or you'll be in a world of doo-doo. After initially wearing the base angle just replace the cutting edge as needed. Good luck
     
  7. Wicked500R

    Wicked500R Senior Member
    Messages: 394

    Also, If you don't have the proper attack angle on the blade...it will put the trip bars closer to the ground and they will touch pavement and wear out quicker. That a-frame MUST be parallel to the ground or slightly higher at the mounting ears than the pivot pin... I started with a brand new base angle and cutting edge both 6" wide and am wearing both at the same time. It took a little while to break the edge in for optimum scraping but it's perfect now. Thats the only thing I don't like about the Fisher is wearing down that base angle...:dizzy: Drive me nutz to think I spent 500 bennies to grind it away on the pavement...YES, It is VERY expensive to replace so it needs to be well taken care of and not worn down too far !!
     
  8. mgf250

    mgf250 Member
    Messages: 38

    On a new plow the trip edge is about 6" high and a new cutting edge is about 6" high.
    Installing or leaving a new cutting edge on a new trip edge will simply result in both wearing at the same time. You just wasted a cutting edge for no reason.

    Wear your trip edge down 1.500 to 2.000 inches. I am not sure if this is an exact science so you should check to make sure YOUR trip edge isn't worn to the trip edge spring brackets. You don't want to touch those at all!! If the bottom of your trip edge is flush with the bottom of the spring brackets then stop and pick up a cutting edge!

    Install a new cutting edge. The cutting edge basically replaces the 1.500 to 2.000 inches of steel that was worn away during your initial use. It prevents further wear to the trip edge and levels the plow.

    Before installing your new cutting edge, be sure to grind the trip edge smooth. Why... If you leave large burrs between the cutting edge and trip edge then you increase the chance of damage. The burrs that you leave will eventually mash down and wear away, this results in loose bolts and then they will either break or cause the cutting edge to split. I would also recommend using Nyloc Nuts


    As for the used plow, depending on how much of the trip edge was worn away...
    If it is a safe amount then I would remove the used cutting edge and save it. Wear the trip edge down as stated above. When you get to the point of needing a cutting edge, install the used one and use it as long as you can, then buy a new one.
    If the trip edge is worn too far then remove the old cutting edge and replace it.
     
    Last edited: Dec 31, 2007
  9. Wicked500R

    Wicked500R Senior Member
    Messages: 394

    My theory is this...Why take a brand new 6" base angle and just grind it away?? Bolting on the cutting edge from the start will double the initial life of the base angle...and If you use your shoes....you will quadruple the life of the base angle AND cutting edge. Base angles are not cheap and I'm not replacing my cutting edge every 2" of wear.. Between the shoes, new base angle, and new cutting edge with carbide Plow Extendors...That's ALOT of metal touching pavement that will last quite a long time...And for all you Shoe Nay-Sayers...my **** scrapes just as good as any other without them !!
     
  10. mgf250

    mgf250 Member
    Messages: 38

    cutting edge wear rate

    A new base angle trip edge and a new cutting edge are both 6" high. This means that when the plow is lowered to the ground, both parts are touching the ground. When you drive forward with the plow down, both the cutting edge and trip edge are going to grind away at the same rate.
    If this is so, then there is no advantage to installing a cutting edge on a new trip edge.
     
  11. Niteman9

    Niteman9 Senior Member
    Messages: 165

    I just pulled the cutting edge off of mime and it scrapes a lot better now. With the cutting edge and base angle both on the pavement you reduce the PSI by 1/2. If you get X hours plowing with both on the pavement. With just the base angle you will get 1/2 X hours. Then you put the cutting edge on it and you get another 1/2 X hours. So you get the same amount of time but better scraping. So I would say run the base angle until about 2 1/2 to 3 inches are worn off then put a cutting edge on it.



    Here is a pic of one which was let go a little to long. Not my Pic I pulled it from another thread here.

    Fisher Cutting edge 2 (Large).jpg

    Fisher Cutting edge.jpg
     
  12. Wicked500R

    Wicked500R Senior Member
    Messages: 394

    Yeah...I never thought of it that way...
     
  13. TurbDies2500

    TurbDies2500 Senior Member
    Messages: 188

    I went a season with a new Fisher 8' HD and then put the cutting edge on the second season. The base angle got some wear and everything seems to be good. I would say that with a plow like that you should have a good amount where the cutting edge extends past the base angle.
     
  14. mgf250

    mgf250 Member
    Messages: 38

    Proof is in the picture

    Thanks for posting those pictures.

    The second picture shows what happens if you wear down your base angle too far, see how close the bolts are to the bottom of the spring brackets. If the owner allowed that to go any further, the springs would have started coming out.

    The new cutting edge brings the plow back to the appropriate height and angle.
     
  15. GTMS

    GTMS Senior Member
    Messages: 101

    My Fisher dealer tells me that I need to let the base angle wear down until it's about 1 1/2 inches below the bolt holes, then put on a new cutting edge.
     
  16. daninline

    daninline Senior Member
    Messages: 430

    This correct I know I got a used truck today and didn't have time to change the cutting edge and one of the springs came out and one more was about to come out.

    I welded everything up so it's good now and installed a 8 foot 8 inch cutting edge if you have the blade down alot get a 8 inch x 5/8 cutting edge it will help out a lot (I only got the 1/2 :eek:).
    Good luck plowing

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