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Technique of Sharpening

Discussion in 'Lawn Mowing' started by MowingisMaddness, Apr 28, 2003.

  1. MowingisMaddness

    MowingisMaddness LawnSite Senior Member
    Messages: 260

    I have read many of the posts on blade sharpening however I still have questions.

    Can some of you address the issue of TECHNIQUE?

    more info from me...

    I am using a RBG 3410-C (is this good? my dad bought it about 5 years ago)

    So for technique...

    1) do I go in just one direction
    i.e. Just to the right or just to the left
    or can I go back and forth?

    2) what about flipping the blade over and sharpening a little of the underside?

    3) what about heating the blade up...like when the melt turns a blue color because of the heat

    4) what about the angle on the flat side of the blade (high 45 or low 15 or somewhere in between?

    5) what about the straight edge of the cutting tip of the blade
    i.e. angle toward the center of the blade or angle away from the center

    and finally 6) what if the cutting egde isn't straight
    i.e. sometimes I get it wavey???

    I know some people will answer just one or two of the 6 questions, but if collectively we answer them all that would be great!!!

    Thanks in advance,

    aj, of maddness
  2. crazygator

    crazygator LawnSite Bronze Member
    Messages: 1,048

    1) Either one direction or both ways.
    2) Do not flip the blade over.
    3) Do not heat enough to blue it. This will cause that area to lose its temper or hardness and be easier to damage.
    4) I try to set the angle according to a new blade. I have forgotten exact degree.
    5) Dont understand this question.
    6) As long as the whole area is sharp then wavey is ok. Just not like an S shape..hehehe
  3. CO.d 502nd

    CO.d 502nd Banned
    Messages: 288

    just use one of these its dummy proof:D

  4. CO.d 502nd

    CO.d 502nd Banned
    Messages: 288


  5. MOW ED

    MOW ED LawnSite Fanatic
    Messages: 5,028

    Holy cow Jack is that a gasoline operated blade sharpener!!!!:D :D :D
  6. FrankenScagMachines

    FrankenScagMachines LawnSite Platinum Member
    from IN
    Messages: 4,739

    Odin ya got a slight curve on your edge :eek:
  7. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    Solid foil blades are like this from the factory. Wish they weren't, but the process that they use to bend the lift wing seems to take a bit away from the cutting edge.

    What blades are they from? Look like a nice hearty lift wing.

    That the new RYAN gas powered version of the Magna-Matic!! :D
  8. FrankenScagMachines

    FrankenScagMachines LawnSite Platinum Member
    from IN
    Messages: 4,739

    Oh I'd never noticed before but it makes sense. I'm sure mine get alittle curved or wavy when I sharpen them too ;)
  9. crazygator

    crazygator LawnSite Bronze Member
    Messages: 1,048

    I thought of another tip for those learning to sharpen their own blades.

    Always make sure the grinding wheel is turning up and away from the blade to grind, instead of down and into it. This will keep the wheel from digging in and burning the blade turning it blue from applying a little too much pressure.

    Some of the nicer grinders like the Magnamatic Odin shows above use soft wheels and I dont think the direction is a big issue with those.

    I just notice a better and faster grind when I use mine this way. I have an older Neary, similar to the RBG.

    Plus, always use the Magnamatic blade balancer. This helps the most and gives you a well balanced mower deck and even cut every time.
  10. Gravely_Man

    Gravely_Man LawnSite Silver Member
    Messages: 2,075

    Hopefully this will be a frequently searched upon post. There is some really good information in here to hopefully answer a lot of questions.


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