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Homemade Reduced Weight Bar

Discussion in 'Chainsaws' started by Jon1212, Aug 10, 2016.

  1. Jon1212

    Jon1212 Birch! Please..... Staff Member

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    The Yapanese guide bars are made with much better/harder steel than the Oregon/Blount/Forester, et al manufactured bars. The difference when milling, or modifying is quite noticeable.

    Takk!
     
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  2. SOS Ridgerider

    SOS Ridgerider Man of many names

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    I see what you did there... Mmmkay?

    Congratulations with your daughter!
     
  3. Lightning Performance

    Lightning Performance Pinnacle OPE Member

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    ditto
     
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  4. Dub11

    Dub11 Some body poisoned the watering hole!

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    I finaly got around pretending actiong like I know something. I hacked on a 18 stihl bar they give you coming from the stihlership. I did the flexxy flexxy test by clamping the tip to the bench then having saw trolls favorite saw ever my ms290 hang on the other side so uncut it sagged 28.7 mm and bar weighed 33.2 oz after cutting it weighed 20oz and sagged 42.51mm Screenshot_2016-11-23-15-57-15.png Screenshot_2016-11-23-15-57-11.png It didnt mill the way I wanted it to because of this waffle crap in the middle so I am thinking biscuts or something to hold the plexie glass in place
     
    Last edited: Nov 23, 2016
  5. Dub11

    Dub11 Some body poisoned the watering hole!

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    oh I forgot the pretty lights I am adding Screenshot_2016-11-23-19-10-35.png
     
  6. Ryan Browne

    Ryan Browne Pinnacle OPE Member

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    So, is it safe to assume that plasma cutting a hole in a bar would wreck the temper?
     
  7. Philbert

    Philbert Chainsaw Enthusiast

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    *Posted this on AS, related to the Oregon Speedcut bars ( http://www.arboristsite.com/community/threads/new-oregon-narrow-kerf-chain-and-speedcut-guide-bars.285694/page-8 ). My attempts to judge the effects of lighter weight and stiffness might apply to evaluating these other lightweight bars:

    Angle of the Dangle

    Weight is not everything. It has more of an effect on longer bars, especially out towards the tip, due to leverage. So I wanted to see what effect the lighter bar had on saw balance.

    I suspended the 353 (empty tanks) from an overhead beam using a couple of ropes, so that it could pivot, and find its own balance point. I attached a carpenter's angle gauge to the only flat spot I could find (rear hand guard) with zip-ties and twisty-ties, to get relative angle measurements (yeah, I could do better in a 'real' laboratory, but this is what I had). I measured:

    IMG_0432.jpg
    - (? unbranded) 16" nominal length: 21 ounces total weight
    - Oregon SpeedCut 20" nominal length: 23.5 ounces
    - Husqvarna branded, 20" nominal length; 28.6 ounces

    IMG_0433.jpg Power Head Only (PHO) - 14°

    IMG_0435.jpg Power Head with 16" conventional, NK bar -

    IMG_0439.jpg Power Head with 20" SpeedCut NK bar -

    IMG_0441.jpg PowerHead with 20" conventional bar -

    Small differences with bars this length - full fuel tank would probably hide it even more. Larger effect likely with longer bars.

    Philbert
     
    Last edited: Jul 24, 2017
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  8. Philbert

    Philbert Chainsaw Enthusiast

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    Flexibility

    I was primarily interested in relative flexibility between the SpeedCut and conventional NK bar, so I used each as a reference for the other. I clamped both 20" bars to a sturdy table at the end of the bar adjustment slot (slightly longer on the SpeedCut bar, so I used that point for both tests).
    IMG_0424.jpg

    I used 15 pounds of weight to estimate a large powerhead, hung just behind the nose sprocket rivet farthest from the tip (same on both bars), and measured the separation. Flipped the bars over and tried it again.
    IMG_0425.jpg

    The SpeedCut bar flexed only about 1-5/8 inches: the conventional NK bar was closer to 1-7/8 inches. About a 1/4 inch difference.
    IMG_0429.jpg
    IMG_0430.jpg

    So this SpeedCut bar does appear to be lighter and stiffer. The stiffness is likely to be more noticable with narrow kerf chain users. The reduced weight will probably be more of a factor with longer length bars used with larger pitch chain.

    Philbert
     
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  9. Czed

    Czed Jon1212 Approved!

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    Any progress?
    I was curious.
     
  10. Dub11

    Dub11 Some body poisoned the watering hole!

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    Nope I'm a slacker. I just need to cut my plexiglass and glue.
     
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  11. Czed

    Czed Jon1212 Approved!

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    Same here I've got a stack of projects.
     
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  12. Dub11

    Dub11 Some body poisoned the watering hole!

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    Yeah this working a job keeps getting in the way.
     
  13. SOS Ridgerider

    SOS Ridgerider Man of many names

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    I've been working/slacking on a 36" for about 6 months now. My buddy who mills them for me just started working in FL, so this one might be the last one I'll be able to make.

    Here's a couple of before and after pics. I haven't gotten the carbon for it yet, but I'm trying a different manufacturer this time.
    IMG_3131.JPG IMG_3132.JPG IMG_3341.JPG IMG_3340.JPG
     
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  14. Jon1212

    Jon1212 Birch! Please..... Staff Member

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    I can't quite make out the weight setting, but your signature line was distracting me......I LOL'd....
     
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  15. SOS Ridgerider

    SOS Ridgerider Man of many names

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    I wonder who came up with that signature dot dot dot? Lol

    The weights are:
    Stock bar 82.55 ounces, or 2339 grams.
    Cut out bar 40.70 ounces, or 1155 grams. I expect to end up with a 35% weight saving, ish....
     
  16. Terry Syd

    Terry Syd Pinnacle OPE Member

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    Thanks for that Philbert, I always prefer objective evidence over someone's 'opinion'. When I wear out my next NK bar, I'll be replacing it with a 'SpeedCut'.
     
  17. SOS Ridgerider

    SOS Ridgerider Man of many names

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  18. USMC615

    USMC615 God...Country...Corps

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  19. SOS Ridgerider

    SOS Ridgerider Man of many names

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    Carbon sheets are fitted. It’s time for JB Weld.
    2C81E853-FE7B-45E8-BE99-FEA84762CB70.jpeg 0AF1F273-422F-4C9E-843D-BF47A7F25C60.jpeg
     
  20. Dub11

    Dub11 Some body poisoned the watering hole!

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