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  1. #31
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    Quote Originally Posted by RayG View Post
    Hmm.. didn't work for me either, but then I noticed a colon missing in the url just after the http.. try this one. http://www.inthewoodshop.com/Commentary/


    Back on topic.. I think it would be a good exercise to do a graph of hang angle vs length of historical saws, and see how much scatter there is, I see the effect of stance, work height, rake angles etc, as all important factors but second order effects when compared to the primary variable which is blade length..

    When the blade length is very short, the second order factors become larger, so I think we see more variability in hang angles with 8" dovetail saws, than we do in say 14" tenon saws.

    Interesting subject, but at the end of the day, it's what works best that counts.

    Ray
    Ray,

    Thanks, your link works for me. The center of effort and it's vector components relative to the ever changing friction point of the tooth line as it passes through the work piece are major factors in handsaw design.

    I think that such an analysis would be multivariate and include additional factors such as:

    1) Work height relative to personal factors such as center of mass, height of elbow relative to the tooth line, height of shoulder relative to tooth line.

    2) Pitch of saw teeth

    3) Rake of saw teeth

    4) Hardness of wood to be cut

    5) Moisture content of the wood

    6) Flexibility of the blade

    7) Smoothness of cut desired, acceptability of blow-outs, etc.

    8) Set of teeth / kerf width / filed tooth characteristics

    9) Center of mass of the saw

    10) Length of tooth line

    11) Desired rate of cut, quick and rough or slow and smooth?

    12) Personal preferences

    13) ???

    So it is likely that rather than hard-and-fast rules dictating the right or wrong way to set up a saw there will be regions of more or less acceptable set up factors. I think that these regions of acceptability are evidenced in the diversity of opinions expressed on this and other related threads on this website but more substantively in the diversity of saw designs that have passed down to us from our forefathers in saw making.

    Cheers,
    Rob

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  3. #32
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    Hi Rob. Your list reminds me of the old saying. "If you just want a straight answer, dont talk to an engineer."

    Stewie;

  4. #33
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    It never ceases to amaze me how people can say essentially the same thing in so many different ways. "That's all I got to say about that" ( Forest Gump ) Happy holidays to all.

  5. #34
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    Also need to consider the rocking motion of the tooth line relative to the cut line through the stroke.

  6. #35
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    Drill Sergeant: Gump! What's your sole purpose in this army?
    Forrest Gump: To do whatever you tell me, drill sergeant!
    Drill Sergeant: God damn it, Gump! You're a god damn genius! This is the most outstanding answer I have ever heard. You must have a goddamn I.Q. of 160. You are goddamn gifted, Private Gump. Listen up, people...

  7. #36
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    I think the true outcome of this discussion is you can't produce a fixed set of parameters for all users, there are too many variables to consider and if you are only going to have one or two dovetails saws then you either need to use them in the exact same scenario every time or they will no longer be the perfect set up.

    You may design the saw around the ergonomics of a particular person, the size & type of timber being used, but if they change work bench, or have the work held in a different manner then it all goes out the window again. The other factor is muscle memory if you learn to saw in a particular fashion be it best practise or not that will influence what suits you best.

    So design to the best intention within a range and avoid the obviously ridiculous.


    Therefore what feels best and works best for you is best in that case.
    …..Live a Quiet Life & Work with your Hands

  8. #37
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    Quote Originally Posted by DSEL74 View Post
    ......Therefore what feels best and works best for you is best in that case...
    amen......

    IW

  9. #38
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    Second to the AMEN


    Sent from my iPhone using Tapatalk

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