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  1. #61
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    Quote Originally Posted by BobL View Post



    "
    I think the top diagram says it all bob.
    regards inter

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  3. #62
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    warragul, victoria australia
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    OK first of all I realised upon further thought my own silly mistake made in my previous statement, too many beers after a hard day will be my excuse.

    any way I went to my shed and got out a brand new stihl chain and my 300 mm/ 12 inch digital verniers and did some measurements with the chain held taught so as not to get any possible distortion of measurement and after careful measurement one figure consistently appeared. As I say this was on BRAND NEW UNUSED stihl chain and carlton or oregon or windsor may differ a small amount. I do know that stihl extensively pre stretch their chain in production.


    I can say that .375 is wrong and .367 is as close as to what I got, measuring as accurately as possible regardless of number of links I got .368 every time although the difference between 0.367 and 0.368 could be as simple as thumb pressure on the verniers, but the the difference to 0.375 is huge and visible by eye quite clearly.

    Congrats BobL you are right.
    I am told that sharpening handsaws is a dying art.... this must mean I am an artisan.

    Get your handsaws sharpened properly to the highest possible standard, the only way they should be done, BY HAND, BY ME!!! I only accept perfection in any saw I sharpen.

  4. #63
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    Dec 2009
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    South Bingera QLD Australia
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    614

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    Now thats sportsman like big thumbs up for Travis

  5. #64
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    What does .404" chain measure when tested the same way ? Are we dealing with a chain measuring conspiracy / plot to throw us off the scent of something bigger.
    regards inter

  6. #65
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    Feb 2006
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    Perth
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    Quote Originally Posted by InterTD6 View Post
    What does .404" chain measure when tested the same way ?
    0.404

    Are we dealing with a chain measuring conspiracy / plot to throw us off the scent of something bigger.
    regards inter
    Nah - it's just tit bit of info I only picked up a few years ago and the a Norwegian CS buff reminded me about it recently when I did some chain speed calcs similar to gerhard.

    3/8 has always been called 3/8 because calling it 367/1000 is a bit of a mouthfull.
    0.375 differs from 0.367 by only 2% , so 3/8 was the closest simple fraction that could be used, and yanks like simple fractions so it couldn't be called 0.367. it could also be called 47/128 (since that differs from 0.367 by only 0.05%) but that is probably worse.

  7. #66
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    So technically its called .375" pitch chain, but technically it doesn't exist.
    regards inter

  8. #67
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    Nov 2004
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    Santpoort-Zuid, Netherlands
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    Hahaha! Still, i got the same results as Travis, so congrats indeed. Took a used Stihl 3/8 RSC chain and laid 25 sets of three rivets in a straight line (just like Inter did with 10 sets). Here in metric mainland Europe, i was tought that one inch equals 2.54 centimeter. So, with each unit of 0.750" being 1.905 centimeter, i should have arrived at 47.625 centimeters for 25 units. But i didn't, it measured 46.7. Devided by 25 you get 1.868 cm for each unit and that's 0.734 inch instead of 0.750. 0.734 devided by 2 is 0.367125.
    No idea why they chose that particular size. Whereas a "13 mm drill" for metric markets sound nice and round as a "1/2 inch drill" on imperial size oriented market (in spite of 1/2"being only 12.7 mm), there is neither a nice round logic to be found in 0.367" nor in its metric translation 0.93218 cm. Like others have stated in their contributions, i also think 3/8 sounds nice, since it is a very frequently used unit in the tool world, of which even leymen tool users can have a good imagination.

    To bend the thread back to the 090;
    do anyone of you use a rim sprocket on an 090? What are your experiences on wear and behaviour?

    cheers

    gerhard

    cheers

    gerhard

  9. #68
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    Quote Originally Posted by Travis Edwards View Post
    Congrats BobL you are right.
    Cheers Travis. Like I said I didn't know this either till I read in on another website only back in 2009, and just like you all I had to measure it for myself.

  10. #69
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    Quote Originally Posted by BobL View Post
    Cheers Travis. Like I said I didn't know this either till I read in on another website only back in 2009, and just like you all I had to measure it for myself.
    You would think that being a saw doctor I would have known this but it is honestly something I have never had to check, you look at a chain and you can see what it is, .325, 3/8 lo pro, 3/8 or .404. When you make up a chain off a roll you simply pick it off the one marked with the appropriate size. I have measured practically every other thing you could ever need to on a chain but never bothered with the obvious....lol
    I am told that sharpening handsaws is a dying art.... this must mean I am an artisan.

    Get your handsaws sharpened properly to the highest possible standard, the only way they should be done, BY HAND, BY ME!!! I only accept perfection in any saw I sharpen.

  11. #70
    Join Date
    Nov 2004
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    Hi Travis,

    it was my meter per minute diagram measured at several RPM's, that brought the topic of 0.08" difference up in the first place, because i based my calculations on 0.750" worth of chain tranport for every sprocket tooth. Since i promised a corrected diagram for 0.734"anyway, i think i better measure up 0.404 and 0.325 as well before i upload it, to prevent this issue from becoming a never-ending story. Though i believe Bob stated that he agreed with my other figures.

    404-chains i do have, but 0.325 will be hard to find over here. The neighbours have a B&D-thingy, but i believe that's 3/8 LowProfile, as most hobby saws are. I'll try to get back with the results soon.

    My question: has any other forum member and 090 owner experience with rim sprockets on his saw? My 070 is fitted with one and it works, but it looks very flimsy. I can see this option tear to bits or derail with 8-plus hp.

    regards

    gerhard

  12. #71
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    Hi gerhard I run rim sprockets on all of my saws, I would not consider them any more flimsy than a spur sprocket. There is actually a lot of strength in a rim sprocket in the way it is made. I would say that BobL would have rims on his 880 which is over 8 hp and they handle it alright. The crankshaft was designed to be strong enough to handle the out board clutch of the 090, so I would not even consider it to be an issue and would honestly think a large percentage would have been sold with them especially of the later model av's.
    I am told that sharpening handsaws is a dying art.... this must mean I am an artisan.

    Get your handsaws sharpened properly to the highest possible standard, the only way they should be done, BY HAND, BY ME!!! I only accept perfection in any saw I sharpen.

  13. #72
    Join Date
    Oct 2009
    Location
    canberra
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    20

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    Quote Originally Posted by Sawchain View Post

    As for visible differences on the 070 copy, there aren't many, I have just worked on a Wun Hung Lo 070 copy and all the parts had Stihl part numbers cast into them, recoil starter side cover had Stihl on it, even the bar had the Stihl logo, it's just that the quality of the saw is total crap. I will not be working on any more of these, just not worth the headaches.
    Check out the pic on the Alibaba site.
    http://www.alibaba.com/product-gs/279417718/070_chain_saw/showimage.html

    On this particular saw which is 3 months old 2 recoil start assy's had to be replaced, the flywheel fan contacts the recoil starter housing, the crankshaft nut on the clutch side had worn a hole in the chain cover due to the nut being too long, the carburettor was near on impossible to adjust correctly to get the saw running, everything was loose, the muffler had almost fallen off, the list is too long to name all the faults.

    The owner of this saw is now looking to get rid of it and buy a decent saw for milling.

    Cheers .... Laurie
    Just an update. My Fake 070 has about 8 hours on it....now the crank is stuffed and the magneto damaged. Add to that the barely functional carburetor and the replacement rewinds you should get the general picture of what a few hundred bucks will buy you in the way of a Chinese "Stihl" 070 .

    I picked up a lightly used MS 880 on the weekend before I got the news about the 070. If the pull start doesn't break my wrist I should be much better off now.

  14. #73
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    Feb 2012
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    crescent city calif.
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    Default 090 stihl

    The 090 stihl comes alive if you bend the governor off and use a straight through midway muffler.

  15. #74
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    Quote Originally Posted by sr thuemler View Post
    The 090 stihl comes alive if you bend the governor off and use a straight through midway muffler.
    As far as I know the 090 governor kicks in when the revs get too high by slightly activating the choke at higher rpm. This just limits the max revs the saw can reach by indirectly richening up the air/mix ration but doesn't change the performance of optimum cutting rpm in the cut so it does not affect milling speed in anything except small logs where more chain speed helps. The saw sounds more alive when the governor is removed because high rpms are achievable but these extra rpms have little useful power behind them. In the cut optimum power RPMs will still be in the 6.5-7k RPM range which can be obtained with the governor on. Raker depths of course must be optimised.

    Modifying the muffler will increase power in the cut provided the saw is re-tuned correctly.

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