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how do I move on....

Discussion in 'Milling & Saw Mills' started by Albert Beerstein, May 16, 2018.

  1. Albert Beerstein

    Albert Beerstein stihl learning

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    Timed cuts in 500 mm wide pine log with squared sides, 1000mm long.

    660, 7 tooth, 3/8 LP full comp, TPFA 10°, DG 8.5°, smooth finish, 114 sec/mtr

    660, 7 tooth, 3/8 LP 2 skip, TPFA 10°, DG 8.5°, smooth finish, 129 sec/mtr

    660, 7 tooth, 3/8 regular, 2 skip, TPFA 10°, DG 7°, smooth finish, 106 sec/mtr ??!?

    090, 7 tooth, 3/8 regular, 2 skip, same chain as above, 74 sec/mtr…

    retest 660 again with same chain – 109 sec/mtr

    the 090 revs slower, the 660 only bogs slightly, why is the old bastard so fast?? I wanted the 660 with 3/8 LP to be as fast as my old setup (3/8 regular 2 skip, 090) as I’m getting a sore back lifting that bulldozer motor up and the 660 is light… what am I going to try next??
     
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  2. Albert Beerstein

    Albert Beerstein stihl learning

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    All chains have same tpca, 55° on grinder ,or a 13/64 file in a 3/16 holder in the field.
     
  3. KiwiBro

    KiwiBro Hold my beer and film this...

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    8 or 9 pin on the picco, then 2-skip it :)
     
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  4. Albert Beerstein

    Albert Beerstein stihl learning

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    I didn't try an 8 tooth, as the 660 seemed to be fairly well loaded with 7t, but I need to know, so despite it cutting into my drinking time,
    2 skip lopro.jpg

    here we have 660, carlton 3/8 LP 2 skip, 8 tooth - - - 67 seconds /mtr! and not a bad finish either!
    finish lopro 2 skp 8t.jpg
     
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  5. andy at clover

    andy at clover Woods!

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    Listen... you hear that sound?
    It's the sound of dozens of forum members running to the classified for an old 088 or 090 :D

    Impressive time difference. Maybe the 660 is getting slowed down more than it seems?

    Since I'm going to start using a winch with a 661, I just ordered a $25 Tachometer/Hour meter to keep an eye on such things.
    When pushing you have a better sense of resistance and speed loss.
    The winch gives some feedback but much less although, the ears can still tell (just not how much rpm is lost).
     
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  6. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    My older larger CC saws have always out cut the 660. Every thing else weighs at least a ton or more at the end of the day. The 660 can do limbing, but try a 40 lb saw and you will quit. I think the chain speed is slower so cuts more effective. Thanks
     
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  7. Albert Beerstein

    Albert Beerstein stihl learning

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    "Impressive time difference. Maybe the 660 is getting slowed down more than it seems?

    Since I'm going to start using a winch with a 661, I just ordered a $25 Tachometer/Hour meter to keep an eye on such things."

    I think you're right, a tachometer might be the next step, I've found no matter how much I think something may give a certain result, empirical testing shows the real situation. And "feel" can be unreliable for deciding whats best!
    I have also been concerned that whilst the 660 cuts its fastest with enough pressure to load the motor down a bit, maybe it's asking too much of it continually?
     
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  8. Albert Beerstein

    Albert Beerstein stihl learning

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    Maybe big old saws just scare the wood more!
     
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  9. KiwiBro

    KiwiBro Hold my beer and film this...

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    If you want a very good tach, I've got a few new Opamma PET-1100R tachs on a shelf somewhere...
     
  10. BobL

    BobL No longer addicted to AS

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    Good work AB.

    What is DG?
     
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  11. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    Those heavy old buzzards without any safety gear and lots of grunt scare me why not the wood too. O still think the great torque and slow chain speed makes a difference. Thanks
     
  12. Albert Beerstein

    Albert Beerstein stihl learning

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    DG is for depth gauge, or raker is more commonly used I guess, DG is easier to write :) I learned most of my chain names from your posts!
     
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  13. Albert Beerstein

    Albert Beerstein stihl learning

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    That looks like a good toolbox quality model! I will probably get a more basic type to mount on the saw or mill frame I think...but thanks
     
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  14. BobL

    BobL No longer addicted to AS

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    Had bit more of a think about your results.

    I'm not sure the 3/16 holder with a 13/64 file produces 55º - it would be good to see some close up pics of each cutter
    Also grinder cut teeth are slightly different to file cut as they clear sawdust differently.
    Can you also indicate which of the chains has what TPCA.?
    Is the LP self feeding or close to self feeding

    One test missing is for full comp regular 3/8 chain.
    If the full comp LP is faster than the 2 Skip LP , then the full comp regular should be faster than 2 Skip regular.
    Mntgun found LP, full comp, was significantly faster than regular, full comp and he tested lots of cuts.

    All that aside the 090 seems to continue to work its charm as I would have expected the times to be a bit closer than that.
    I'd like to see what time the 090 could pull cutting with an 8.5º DG!
     
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  15. Albert Beerstein

    Albert Beerstein stihl learning

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    no worries Bob, I'll get onto those trials and get some photo's this week, I like a bit of experimenting!
     
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  16. Rosss

    Rosss ArboristSite Operative

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    following
     
  17. Tin-knocker

    Tin-knocker ArboristSite Operative

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    How much are you looking to get for one of those tachs?
     
  18. KiwiBro

    KiwiBro Hold my beer and film this...

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    US$80 delivered.
    This tach model is the real deal, not some cheap tacky ( :) ) toy.
     
  19. Albert Beerstein

    Albert Beerstein stihl learning

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    Test results and pictures Bob asked for - pictures first, 3/8 regular 2 skip 7° DG


    38 reg 2 skip tooth 7 deg.JPG
    3/8 Lo Pro 2 skip 8.5° DG
    38 lopro 2 skip 8.5 deg.JPG

    3/8 reg with DG filed to 8.5°

    38 reg 2 skip 8.5 deg.JPG
     
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  20. Albert Beerstein

    Albert Beerstein stihl learning

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    090 on mill with 3/8 reg 2 skip, 8.5° DG
    090 38 reg 2skip 8.5 deg.JPG

    The chain R&D department
    IMG_2707.JPG

    finish on cut with 8.5° DG, time 70 seconds per metre, but I could improve that with practice as it self fed so well it was more a matter of being smooth and careful not to allow it to stall the saw down, rather than push it into the cut.
    My other chains self feed well but still need a bit of pressure, the 8.5° DG chain fed so easily that I had to guide the mill very smoothly or it started to pull into the wood very hard, and would start to stall down the motor. Will try full comp. chain on the 090 with 8.5° DG this arvo.....Had another try with 8.5° 2 skip, thought i did a really smooth pass through the cut, but still 71 seconds per metre?


    finish 38 2skip 8.5 deg 090.JPG
     
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