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Thread: New Matilda Bow Saw
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8th January 2010, 11:33 AM #1
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New Matilda Bow Saw
Hi all. Attached are images of the newly designed Matilda Bow Saw.
Template design. The fasteners shown for the top spreader were replaced with M6 X 35 High Tensile Cap Head Screws.
Completed bow saw. Matchbox on the left hand side of photo.
Photo showing spring steel tension plates fitted to the inside of the frame arms.
Total weight is 1.05 lbs (0.54kg).
Depth of cut = 8 inches.
Individual components including threaded inserts,washers,ferules,screws, and frame = 62
Although heavier than a Gramercy, the Matilda Bow Saw is still very well balanced.
To tension the blade, you wind the threaded handles in until the blade connecting screws lock into the inside of the frame arms.
The additional 3rd handle is very handy inclusion when using the bow saw with the blade set off vertical.
I am extremely happy with this design. Its performance, weight and balance, as well as ease of dismantling, is what I have been striving for.
Planemaker.
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8th January 2010, 08:13 PM #2
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Looks nice.
"The training of the eyes to know when an edge is perfectly straight or a surface is flat, free from winding, and straight, is a very important part of a lad's training."
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11th January 2010, 12:10 PM #3
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Interesting.
The humble bowsaw comes into the 21st century?!
Cheers,IW
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20th January 2010, 03:33 PM #4
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Hi all. The following images show some recent changes I made to the Matilda Bow Saw. I think the newly shaped spreader is a nice improvement on the previous design.
I have also included the set up used to measure the frame when under tension at 0.5 inch of wind in. This measurement replicates the span of the bottom arms with a blade fitted and properly tensioned..
The readings were taken: without the steel bands being fitted; with outside bands only; with inside bands only; with inside & outside bands fitted.
The results were: Nil bands = 15.35 lbs ; Outside = 16.05 lbs ;
Inside = 18.04 lbs ; Both bands = 19.84 lbs.
A destruction test was also completed. This highlighted frame failure at 1.5 inches of wind in. (No steel strapping to frame).
A worthwhile exercise.
Regards Planemaker (aka Swagman).
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