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Thread: Hand Saw Sharpening.
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22nd May 2017, 03:56 PM #1Deceased
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22nd May 2017, 09:04 PM #2
Stewie
That is an interesting and innovative way of achieving sloped gullets while still filing comfortably. I have always thought that the saw vices with the adjustable ball and socket partially addressed this problem, but they do not seem to be sufficiently rigid or at least the vice I have is like that. I should probably say that for re-sharpening they are fine, but if major work is required they vibrate too much. Your vice looks as though it would be very rigid.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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22nd May 2017, 09:39 PM #3Deceased
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Thanks Paul. If your after rigidity within a Saw Vise I would recommend you consider purchasing the Gramercy. Its design is based on the earlier Wentworth No.2 Saw Sharpening Vise.
Stewie;
Brent Beach has written an excellent article on the subject of Sloped Gullets;
Sloping Gullets
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23rd May 2017, 03:33 PM #4Deceased
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24th May 2017, 03:18 PM #5Deceased
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25th May 2017, 05:33 PM #6Deceased
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Attached is the final example of Sloped Gullets I will be posting. Its a Rip Tooth Backsaw being converted to a dedicated Mitre Box Crosscut Tooth (with the addition of 10 degree Sloped Gullets.)
After completing the 2nd run of Sloped Gullets;
Multiple test cuts with the newly profiled teeth. (Excellent results.)
For those that don't feel highly competent at filing a crosscut tooth pattern, your likely to find the addition of sloped gullets way too challenging.
Stewie;
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26th May 2017, 12:19 AM #7
Stewie
At least with some Forum members you may be preaching to the converted:
Sloped Gullets
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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26th May 2017, 01:13 AM #8
Just recently I had a real reason to use a hand saw. I was curving some garden edging and decided that I needed to minimise the gap the glue had to fill.
P1020841 (2).JPG
I used a fine tooth saw, but was too clever by half. The kerf was so narrow I experienced considerable difficulty in getting the epoxy glue in. So next I used the SCMS! Later on I had to curve the timber in two directions so the SCMS was not an option. However I resorted to the coarse 6ppi crosscutting saw: A good compromise as it happens which I should have used in the first place.
The point of this apparent digression is that both handsaws are sharpened with sloped gullets.
In cutting the garden sleepers I had sawn though a label at the end of the timber, which was fixed with staples. It didn't like that much and I was up for resharpening. My sloped gullets are a little more extreme. Around 40 degs.
P1000639 (2).jpgP1000647 (2).jpgP1000652 (2).jpgP1000655 (2).jpgP1000648 (2).jpg
After sharpening the saw I tried it on some rough sawn Forest Red Gum:
P1000657 (2).jpg
then with the 6ppi saw:
P1000659 (2).jpg
The two cuts together for comparisson (not sure you will be able to see the difference):
P1000660 (2).jpg
Something of which I have become aware is that as the slope is increased it seems advantageous to increase the rake at the same time. The following pictures show teeth filed at 20 degs rake but with zero slope:
P1000670 (2).jpg
with 40/45 degs slope:
P1000669 (2).jpg
and 60 degs slope:
P1000672.jpg
The saw was deliberately not cleaned to make the effect clearer. The saw was also only filed on one side so there is some irregularity in the teeth. The purpose was to indicate that the tooth rake diminishes as the slope increases. Recently I sharpened some saws at 15 rake and 20 fleam. They didn't work well at all as it was much too aggressive and grabbed. I then reversed them to my normal practice of 20 rake and 15 fleam and the saws performed well again.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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12th June 2017, 11:01 PM #9
Sloped gullets might be unnecessary for someone who is only just comfortable with filing straight across ... but I don't agree with that statement.
It seems to me that it's a small step to tilting the blade (or file) and filing straight across.
Filing at an angle, and mirroring that on the other side, is another step again IMO.
Cheers,
Paul
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