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Thread: Latest backsaw handle design.
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2nd July 2015, 04:17 PM #1Deceased
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2nd July 2015, 04:53 PM #2GOLD MEMBER
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Very nice proportions on that one.
How big a balde is it for?
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2nd July 2015, 05:02 PM #3Deceased
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14 inch; 3 1/2 inch below the spine; 10 tpi; 10 degree rake angle; no fleam; 0.025 gauge saw plate.
regards Stewie;
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2nd July 2015, 07:01 PM #4
That's very nice Stewie.
Pete.
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2nd July 2015, 07:08 PM #5
Nice handle
regards
Nick
veni, vidi, tornavi
Without wood it's just ...
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3rd July 2015, 04:15 PM #6Deceased
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On another forum I received this question regarding this backsaw handle.
The following was my reply.
Hi Rich. The notch allows the bottom rail to flex during seasoning wood movement. Without that notch there is a likelyhood the bottom rail would fracture some time in the future, most likely at a point further up along the bottom rail at or near the curvature of the lambs tongue where there is vulnerability due to a lack of long grain structural strength within that area. Hope that helps answer your question.
regards Stewie;
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4th July 2015, 12:06 AM #7Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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5th July 2015, 12:40 AM #8GOLD MEMBER
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I've always understood that the notch or clip was a design element that provides a nice transition between the curved cross section of the lamb's tongue and the straight cross section of the lower horn.
Surely the presence of the notch would only make the handle weaker?
I'm not about to test any saws to destruction to prove or disprove this!
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5th July 2015, 01:29 PM #9Deceased
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Have a look at the photo of the Kenyon backsaw handle submitted by Pedder. Note where the fracture occurred on the bottom rail.
Also, take note of the sharp change of direction from the bottom rail to the lambs tongue.
http://www.ukworkshop.co.uk/forums/t...aw-t90319.html
Stewie;
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5th July 2015, 03:22 PM #10
Not surprising that the Kenyon saw handle you point to fractured where it did given that the grain axis will generally trend from the back through to the top horn. The grain at the point of breakage is at about 90o to the bottom rail of the lambs tongue and parallel to the grain axis, reducing the inter-lamina contact area to a minimum thus creating an extremely weak point. Such a structure is weak in much the same way as if one were to create a dowel with it's long axis perpendicular to the grain of the wood. Nonetheless, the step does look nice, one just needs to be careful.Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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5th July 2015, 04:11 PM #11Deceased
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Work on the saw plate assembly is now complete. The handle has received its 4th coat of garnet shellac. 2 more coats remaining. After the last coat of shellac I allow 5 days for the shellac to further harden before I work the surface down with a cutting paste, then buff to a shine with a powered mop.
Stewie;
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5th July 2015, 09:00 PM #12
Very nice work Stewie. Are you following the usual French polishing techniques?
P.S. Also, interesting how stylistic features tend to divide opinions in the thread you linked.Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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5th July 2015, 10:37 PM #13Deceased
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5th July 2015, 10:55 PM #14
Another example of https://en.wikipedia.org/wiki/Sayre%27s_lawInnovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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5th July 2015, 11:37 PM #15Deceased
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