Building a model Drag Saw

Discussion in 'A Work In Progress' started by Brian Rupnow, Aug 28, 2018.

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  1. Sep 13, 2018 #61

    goody

    goody

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    Nice, I have a full sized Vaughn drag saw which is currently in a logging museum in Northern California. My older brother restored it 20 years ago. The bar is 2 parallel rails about 3 feet long the clamp for the blade mounts on the rails and travels about 2 1/2 feet the whole bar pivots from the rear. The blade is 6 foot long with 2” double cut teeth, the pitman arm is roughly a foot long and drives to the center of the slide. Stroke rate is around 60 per minute.
     
  2. Sep 13, 2018 #62

    goody

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    So I did a google search for the Vaughn and a YouTube video showed up of my older brother running the saw at a show in Idaho. If you want to watch one in action.
     
  3. Sep 13, 2018 #63

    Brian Rupnow

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    Today was one of those days when I spent more time figuring out how to make some of the parts than I did making the parts. The first three parallelogram arms are semi finished and shown in place.
    [​IMG]
     
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  4. Sep 13, 2018 #64

    Brian Rupnow

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    Goody--There are two types of drag saw. the one you are describing, and the other type which I am building, with a set of parallelogram arms. See the very first post in this thread to see the type I am building.---Brian rupnow
     
  5. Sep 14, 2018 #65

    nel2lar

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    Goody
    How about a site we can go and see that saw and it's working. The industrial age brought out all kinds of invention. It just goes to show we are always looking for an easier way to do chores that must be done.
    I found the videos and they are all so very much alike with added features like the
    Ottawa Model T.E. 4HP and 5 HP Drag Saw, which the transport wheels would turn 90° to be used as stabilizers while cutting. Very interesting how one persons mind works to another, I suppose it had to do with patent violations.

    Nelson

    for those interested in additional saw look here:
    https://www.youtube.com/results?search_query=Vaughn+drag+saw
     
    Last edited: Sep 14, 2018
  6. Sep 14, 2018 #66

    Brian Rupnow

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    It doesn't look like much, but I have a full days work in these parallelogram arms. Each arm has oilite bronze bushings at the pivot points. The actual pivot pins are 3/8" shoulder bolts. I got very lucky and discovered that one of my slitting saws was the same width as the saw blade I plan on using, so the bottom link is slit and ready to accept the saw blade. Tomorrow I will possibly make the crank arm and the connecting link. I was a bit concerned about there being sufficient weight in the arm assemblies to force the saw into the cut, but now that I have the arms almost finished I see that there will be sufficient weight.
    [​IMG]
     
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  7. Sep 14, 2018 #67

    Brian Rupnow

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    Check out this video of a drag saw with parallelogram action, same as the model I am building. Notice that the wheels are NOT turned at 90 degrees, but are positioned the same as the wheels on my model.---Brian
     
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  8. Sep 15, 2018 #68

    Brian Rupnow

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    As I say in the attached video, "We're almost ready to rock and roll." I need to cut out my saw blade and machine a lever to operate the clutch and then I think we will be ready to cut up a log.---Brian
     
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  9. Sep 15, 2018 #69

    Brian Rupnow

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    And for those of you who asked "Where do you get a blade" and "You know those saws only cut on the pull stroke." Here is where you get the blade with the teeth cutting in the correct direction. About 10 minutes work with a die grinder and an abrasive wheel. I wrapped a piece of steel bar with a wet dish cloth and laid it over the part of the saw I wanted to keep so the heat wouldn't warp it. Now if I'm really lucky, I will be able to carbide two 1/8" diameter holes in it to bolt it on.
    [​IMG]
     
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  10. Sep 15, 2018 #70

    Brian Rupnow

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    I may have to rename this thing the Pinnochio saw---
    [​IMG]
     
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  11. Sep 15, 2018 #71

    nel2lar

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    Brian
    How sweeeeet it is, beautiful. You have done a very nice job on tha Pinnochio Saw.
    Can not wait to see it in action. Very nice.
    Nelson
     
  12. Sep 16, 2018 #72

    Brian Rupnow

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    I have a laymans knowledge of handsaws. My dad was a carpenter when he wasn't lumberjacking, so I know the difference in a cross cut saw and a rip saw. I have a vague notion of what "raker teeth" do. My saw knowledge stops about there, and although I am aware of "pit saws" and "ice saws", I have no idea as to the tooth profile. I have never seen a "real live drag saw" other than a couple of weeks ago when I seen one that wasn't operating at a steam show in Milton Ontario, and it wasn't the type which I am building. You folks have no idea of how desperate I get to find something mechanical that I haven't already built. This has been a fun build, and I am in the home stretch now. I may even give this thing a test drive tomorrow, but only on a pine 2 x 4. I won't make a video until I can find a 3" diameter round of dry cedar or pine with the bark still on it. I still have to build the handle which engages and disengages the dog clutch, but that won't stop me from taking a test drive.
     
  13. Sep 16, 2018 #73

    Brian Rupnow

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    I am about to finish the final parts of this drag saw. If you have followed this post, you will know I am using a dog clutch which is engaged and disengaged by a lever. I have watched two dozen videos of drag saws on YouTube, and I'm still not certain of what type of clutch they used--it isn't clear in the videos. If anyone has detailed knowledge of how these original drag saw clutches operated, now would be a really good time to contact me and let me know. I have heard that they too have lever operated dog clutches, but I have also heard that they had friction clutches which gave them a gentler engagement than a dog clutch. If anyone has this knowledge, I would really appreciate a heads up.---Brian
     
  14. Sep 16, 2018 #74

    nel2lar

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    Brian
    I was looking back through some of your builds and there it was. Take a look at your sawmill build and the way you engaged it, it might work better on this.
    Nelson
     
  15. Sep 16, 2018 #75

    Brian Rupnow

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    The cone clutch on that sawmill set up works great, but if you looked closely you will see that after the clutch is engaged, there is a spring loaded toggle that pops up and holds the engagement lever in place. And--That spring loaded pop up lever has to be depressed before the handle can release. It works great, but there are a lot of parts there to fit into a simple handle.
     
  16. Sep 16, 2018 #76

    Brian Rupnow

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    Today I finished the dog clutch engagement lever. I realized that I had no way to put in the fancy scallops on each side that are shown in the cad model, because the handle is too long to swing on my lathe faceplate. If I can make it work properly, I may drill a series of cosmetic holes down the face below the hole that fits over the clutch diameter. Right now it works fine as far as engaging g/disengaging the dog clutch goes while the engine is not running, but there is nothing to make it stay engaged or disengaged. I have been warned that it is difficult to disengage the dog clutch while the engine is running. If that is true, perhaps I can just install a light spring that makes the lever disengage when no other forces are applied to it.
    [​IMG]
     
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  17. Sep 17, 2018 at 1:29 AM #77

    nel2lar

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    Brian
    Another idea. Do you think a ball detent down through the handle with a couple small spots on the shaft to engage in and out.
    Just an idea.
    Nelson
     
  18. Sep 17, 2018 at 1:41 AM #78

    Brian Rupnow

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    Nelson--If there was a greater range of movement, I would do that. The movement at the clutch components is less than 1/4", so the handle doesn't move enough near the pivot point to use a ball detent.
     
  19. Sep 17, 2018 at 3:59 AM #79

    nel2lar

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    Brian
    Another one down,
    Good luck
    Nelson
     
  20. Sep 17, 2018 at 3:08 PM #80

    Brian Rupnow

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    So--We have confirmation that everything goes round and round and up and down when the saw is operating but not actually cutting anything. Next step will be for me to tramp around in the woods behind my place and find a real 3" diameter log to cut.

    [​IMG]
     
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