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Chain sharpening angles on Oregon 73LG please

Discussion in 'Chainsaw' started by albngore, Dec 28, 2005.

  1. albngore

    albngore ArboristSite Lurker

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    On my .325 pitch full chisel chains I have always used a 10-degree down angle and a 35-degree side angle when filing with a clamp on file guide. I just bought a used 372XP with a 73LG full chisel chain (3/8 pitch by.058 gauge) and cannot find information on how to file this chain. I also need to know if a .025 raker guide is the right one for the 73LG. I cut softwood almost exclusively, so I would also like to know if when I replace this chain should I get the same chain or a different spec.? Would someone please advise me?

    Thank you.
     
  2. trimmmed

    trimmmed B?rgermeister

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    Keep the 10 degree down bubble, change to a 7/32" file and change the angle to 25 degrees. Not sure on raker depth w.o. checking. But for $3, Baileys has a file-o-plate for that chain, which'll set all your angles and your rakers.
     
  3. SawTroll

    SawTroll Information Collector

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    Trimmed is right about the angles and file size - at least that is what Oregon recommends.
    The Husky combo roller guide/raker guides works wery well both for the cutters and rakers.
    The blue one is the right one for the 73LG.
     
  4. jokers

    jokers Banned

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    73LG is the chain that I use most. 10° downangle on the file handle while filing inside out is the recommended angle although 90° to the bar works nearly as well. What is easiest to achieve precisely for you?

    25° on the topplate is the generic factory setting. Cutting clean softwood you can go as steep as 35° and possibly find some speed in the cut.

    Be careful that you don`t get too much or too little sideplate or "hook" angle. The inside topplate angle which is derived from the amount of hook that you have should be around 60° measured from the bar. On a saw like the 372 in softwood you can run more hook giving you a sharper inside angle. This angle is produced by how high you hold the file against the tooth. 1/5 the file diameter(7/32) above the topplate is the recommended amount, less than this gives you more hook.

    Russ
     
  5. Gypo Logger

    Gypo Logger Tree Freak

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    Hey Russ, was that a copy and paste from the forestry forum?
    You're great at dishing out information you have never used except to pontify.
    Maybe you should add a disclaimer to your signature: Googlemeister of AS.
    Hahaha

    Anyway albgnore, I'll see if I can find some 325 chain that has been properly filed and take some pictures.
    John
     
  6. jokers

    jokers Banned

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    Hi John,

    Glad to see that your reading comprehension and mental acuity still sucks. Try going through this clean and sober Crutchboy. :laugh:
    Let me walk you through where it`s clear to anyone with a greater than grade 8 education that albngore clearly stated that he needs info on 73LG, not .325chain.

    Although I do concede that your 73LG is pretty good, I doubt that you`ll find any good .325 amongst your chains.

    I think that you are simply upset that I have not needed to dedicate my whole life, or even a significant portion of it, to learning what you may know after a lifetime in the bush. Don`t feel too bad John, a productive society cannot function without an ample supply of "neck downers". Your position is secure.

    Russ
     
  7. Freakingstang

    Freakingstang Doctor Freakinstein

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    I have the oregon file clamp on deal too. I have always used the 10 degree up, not down from inside out. Are yous sure it is supposed to be down? Mine cut fairly well, like a new chain. I usually make them closer to 5 degrees, again up, not down. I think this makes a faster, cleaner cut. My father claims it is better than a new chain, but I think it is similar. I also make the other angle 30 degrees. They cut extremely well for a non professional sharpened chain, although they don't last as long as a new edge on a new chain . I cut mostly medium to hard, hardwoods.

    Maybe I'll try these angles you suggested and try it out.
     
  8. Crofter

    Crofter Addicted to ArboristSite

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    Handle down; pointed up! In any case follow the same tilt as the top plate and you wont go wrong.
     
  9. Freakingstang

    Freakingstang Doctor Freakinstein

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    ok, I've got tha handle down and come up with the fililing motion. I think we are saying the same thing.
     
  10. albngore

    albngore ArboristSite Lurker

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    Thanks fellas for all the advice

    I have been doing what you all advise, but have been using a 35-degree angle and it seems to hold a pretty good edge in the softwood I cut. I always use an Oregon clamp-on file guide and yes it is a bit clumsy but it does keep me trued up well. I am intrigued by the roller guides I have heard about and folks seem to like them alot. I'm wondering if these rollers also keep the file at the appropriate 10-degree (handle) down angle as well as holding the correct side angle? Thanks again for all your help.
     
    Last edited: Dec 29, 2005
  11. SawTroll

    SawTroll Information Collector

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    Keeping the file at the right height is where the roller guide really shines!:)

    It also works as a "handle" to rotate the chain, so you don't need to use gloves when sharpening.
     

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