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  1. #1
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    Default BMT Patent saw teeth

    Here's a sharpening challenge ...

    Montague-Woodrough Saw Company - Chicago, IL






    and someone who was up for the job ... bmt_hand_front.jpg Photo by daryl_weir | Photobucket





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  3. #2
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    Doesn't look like there's any set on the teeth?

    And what's a "Circular A"?
    Regards, FenceFurniture

    COLT DRILLS GROUP BUY
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  4. #3
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    Default BMT Patent saw teeth

    'You only need a single flat file with one safe edge' ..and 15 hours.
    ...I'll just make the other bits smaller.

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    And what's a "Circular A"?
    Junk mail.
    Cheers
    Hugh

    Enough is enough, more than enough is too much.

  6. #5
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    Quote Originally Posted by FenceFurniture View Post
    Doesn't look like there's any set on the teeth?
    Hmmm ... that is how it looks ... (you can find the Patent docs online.)

    And what's a "Circular A"?
    The one you get before "Circular B"

  7. #6
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    Besides a small flat file wouldn't you also need a "raker guage "?

  8. #7
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    Quote Originally Posted by 1thumb View Post
    Besides a small flat file wouldn't you also need a "raker guage "?
    The saw actually came with instructions etched onto it ... so if yours faded, you'd have to photocopy your mates' saw.

    Cheers,
    Paul





  9. #8
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    Quote Originally Posted by pmcgee View Post
    Hmmm ... that is how it looks ... (you can find the Patent docs online.)
    Yairs.....but I should tell you, there's another guy that LOVES finding really obscure stuff on the net. It's not for me to deprive him of a wonderful opportunity (for something).
    Regards, FenceFurniture

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  10. #9
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    Regards, FenceFurniture

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  11. #10
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    I wonder how fast it would cut in hardwood
    cheers pat

  12. #11
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    Default Woodough

    Can you imagine this blade with a Woodrough and Macfarlin Panther Head handle - now that would be an amazing saw - Neil (I seem to have lost linefeeds)

  13. #12
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    Well it looks like TFWW have taken up the challenge and produced their own modern version of the BMT saw:
    https://www.toolsforworkingwood.com/...20the%20Future
    Attached Images Attached Images

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    Interesting! I must have a look at the patent application to see what they claim is actually unique & patentable about those teeth, because they are very similar to one of the (many!) tooth patterns on old crosscut felling & docking saws I've seen. They are shaped differently, but the principle is the same as an "M-tooth raker" i.e., a couple of pointed side-cutting teeth followed by a raker tooth to take the chips out. It seems counter-intuitive to me that the raker precedes the side-cutters in this saw - maybe there's an explanation in the patent, I better go & read it!

    Cheers,
    IW

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    OK, the first patent is here. And whaddya know, it's all about large timber saws, so my first-impression idea of its pedigree was pretty close, it seems..

    I don't know how many saw tooth patterns have ever been patented (Paul, a job for you in your spare time? ) but in my search for the patent info, I dug up this interesting tidbit: .....from 1810 to 1925 almost 900 different saw sets were patented.....
    I knew there were a few different sawsets kicking about, but nothing like that. As with so many patents, most never reached the market, I assume?

    Cheers,
    IW

  16. #15
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    What, exactly, do they claim is the value of this toothing pattern?

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