Baby bow saw

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Blog series by Dave Polaschek updated 01-02-2021 08:38 PM 6 parts 3799 reads 64 comments total

Part 1: First day’s construction

12-26-2020 06:54 PM by Dave Polaschek | 8 comments »

I decided I don’t like the metal-frame coping saws. I find that the far end of the saw will often twist when I don’t want it to, and I’ll end up cutting a curve when I don’t want to, or cutting a straight line when I want a curve. So I decided I’d make a bow saw that uses the standard coping saw blades to complement my bigger turning saws ( 1 and 2). First I cut the arms out of a piece of citrus I got from AZWoody a couple years back. Then I drilled holes in the arms for the pins (from Gra...

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Part 2: More shaping

12-26-2020 10:31 PM by Dave Polaschek | 14 comments »

This afternoon was spent shaping the cross-piece and the arms. First up, taking a spokeshave to the cross piece to thin it slightly in the middle, and make the ends match the arms nicely. It’s not going to be a huge taper, but just a little bit looks a lot better than none. Plus I get to smooth out the surface now. I don’t think I’ll be doing any sanding on this saw, so I want to fix any little spots of tear-out from cutting and planing the pieces. Then I used the spokeshave an...

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Part 3: Wrapping it up

12-27-2020 09:37 PM by Dave Polaschek | 11 comments »

I got the bow saw completed today. I still want to decorate it, but it’s together and functional now. First on today’s menu was getting the arms shaped. They don’t really need to be thinner, but making them a little thinner will make the saw more comfortable to use. I used a drawknife to get the other dimension thinned down and smoothed. With that done, I mixed up some epoxy and glued the pins into the handles. Then some quick chamfering on the corners of the arms, mostly...

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Part 4: Cleaning up the surfaces

12-29-2020 02:56 AM by Dave Polaschek | 6 comments »

I decided I didn’t like the little spots of tear-out and places where the grain left me with a rippled surface, so I spent an hour today going after the pieces of the saw with a card scraper. I also cleaned up the shoulder on one of the tenons on the cross-piece. That makes the arms of the saw sit more in-line with each other so the saw blade won’t be stressed more than it needs to be. The citrus looks a nice yellow with the tung oil on it, but I’ve decided the frame of this saw...

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Part 5: Test run

12-29-2020 05:18 PM by Dave Polaschek | 17 comments »

So at the urging of a few people who wanted to know how the saw would cut, I put it together this morning and cut a curve in some ¾ pine. Nothing tricky, but the kind of thing I end up doing a lot. I put in a new Pegas Coping Skip 6.5” 18tpi blade, and tightened it up. I took it to about an A#, just above A440Hz. That’s an octave below the tension I normally have in the metal-framed coping saw, but it feels more solid. I’ll tighten it up further after I re-tie the string a little tight...

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Part 6: Kolrosing

01-02-2021 08:38 PM by Dave Polaschek | 8 comments »

Once the saw was “done” I still wasn’t quite happy with it. I decided it needed decoration. With the light yellow of the citrus wood, the dark brown of coffee grounds made a very pretty contrast. Kolrosing (or kohlrosing) it is! I decided to do a more linear pattern on one side, and a more curvy, or floral pattern on the other, mostly to get more experience and figure out what I like better. I started with the lines. That was yesterday morning. This morning, I made curves. In...

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