I picked up this saw for $3.00 at an estate sale a few weeks ago and I've been anxious to give it a little love. The plate was dead straight as found, so I was hopeful that it would make a good user saw. When I got it, I could just barely make out anything on the etch. The medallion just said "Warranted Superior", nothing about Disston.
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Disston Keystone K1 12" backsaw |
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Can't make out much of the etch |
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Medallion |
After turning it in the light and using lighted magnifying goggles, I could read Keystone K1, made by Disston U.S.A. I googled that to get a better idea of the etch.
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Photo from Jim Bode Tools (jimbodetools.com)
A similar saw in 14" length, with good etch |
From Erik von Sneidern's "
Disstonian Institute" website, I read that the Keystone line of saws was aimed at "lower end" buyers - homeowners and hobbyists. But the quality was reasonably good so as not to sully the Disston name.
The first thing I did was disassemble the saw and clean up the handle.
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Did not take the back off the saw plate |
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Scraping to remove old finish |
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Quartersawn beech handle |
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Scraped, filed and sanded |
Over three days, I gave the handle three coats of BLO. I just love the feel that it gives.
The saw plate wasn't in bad shape - no major rust or pitting anywhere - just years of crud and I worked on that with sandpaper, mostly 220 and 320 grits.
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Right side of the plate shows how dirty it was in comparison to the part embedded in the handle |
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Outlined the etch so that I wouldn't destroy it by sanding.
I destroyed an etch via sanding once before and was extremely disappointed - never again! |
I did go lightly over the etch area with sandpaper wrapped around a flat piece of wood and that helped. It's not perfect, but I'm happy how it turned out. I can read the etch easily.
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Plate finished |
I used a wire wheel in the drill to work on the saw bolts and medallion. Two of the three screws needed a little filing at the rim of the driver slot.
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Medallion cleaned up a little, others as found |
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After clean-up |
Now it was decision time. As found, the saw had 12 tpi and it was tough to tell, but it was filed cross-cut. I already have a 12 tpi x-c saw, so I thought about filing off the teeth and changing the saw's configuration. The saw plate is 0.030-0.031" thick, whereas my other x-c saw is 0.026" thick. I like the thinner plate, but I like the handle on this new saw much better. I decided to keep the 12 tpi x-c config. I'll show the two saws together later.
The funny thing about the teeth was that they weren't exactly 12 tpi - there was some drift over the length of the toothline.
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Tooth peaks line up with a 12 tpi template at left, drifting away from the lines at right |
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The teeth were not too badly shaped, but definitely not all even |
I've only sharpened my cross-cut saws about a half dozen times and have a fair amount of room for improvement. So I took this slowly.
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Jointing the teeth - had to file a lot as some teeth were quite a bit lower than others |
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Tops jointed - note how some teeth were barely touched |
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Started the sharpening by filing straight across to make the teeth uniform.
Left half of teeth in this photo are done - aiming to make the gullets line up with the template marks |
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Used a brand new Bahco file that lost its teeth on one corner very quickly (see upper edge),
but that could have been due to my technique - or not! The same file got me through the sharpening. |
Because the teeth had "moved" from their original 12 tpi position and were not exactly lined up with the template marks, I filed aggressively to move some teeth to where they should be.
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After filing straight across, I jointed again and found where to file further.
It took three jointings and filings to get to where I was happy with the location and shape of the teeth. |
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The teeth were fairly even, though not yet filed for cross-cut |
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Next added a little set to the teeth |
After applying some set, I filed cross-cut with 14° rake and 20° fleam (my standard). I filed carefully, so as not to remove the entire flat spots on the tops of the teeths after filing from both sides. I rejointed a couple times, trying not to end up with "cows and calves" - small and large teeth.
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Not too shabby, but still far from perfect |
For the set, I was aiming for about 0.037" total set, but as always I got more set than I wanted - and it wasn't consistent either. I first lightly hammered back the set, using a larger hammer in the vise as an anvil. Then I "stoned" the teeth on both sides with a diamond plate to get the set more even along the whole saw.
OK, just for picture comparison, here is the pre-rehab picture:
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As found |
And here she is, all gussied up. The plate looks pretty good. And a couple of test cuts convinced me that I did OK on the sharpening.
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Glamour shot |
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Starboard side |
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Handle closeup |
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Ditto |
And for comparison, here it is with my Spear and Jackson 12" cross-cut backsaw (with a butt-ugly handle).
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I like the Keystone's handle much better.
Both perform about the same. |
Now I just need to find a spot for it - might need to move a few things around on the rolling cabinet that I use as a saw till.
UPDATE: I've now used the saw a number of times and find that it doesn't seem to cut as easily as the S&J. I'm guessing that's because it cuts a slightly wider kerf. Perhaps I'll use the S&J for joinery work and the Keystone for rougher work.