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Short staves- draw length and draw weight trade off - Finished with pics

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jameswoodmot:
Well, that didn’t last long! I’ve been trying to get this gas burner heat treating method sorted but it’s being a real pain. There are so many variable to getting it set up I’m finding it hard to work out how long to cook stuff. Also, with small diameter staves there is that gap where the back can get cooked.

I started with these western red cedar slats. Smelt like a sauna until it smelt like a burning sauna. They didn’t last long.

I had the burner on the ground and then realised at ground level there are all sorts of gusts and breezes blowing the glaze around.

Then I lifted the whole thing up and balanced it on various things. (Which is what I was trying to avoid) and then it worked better.

Then I cooked it all the way through!

Ive decrowned it as I wanted to see if it was the hot air getting to the back or if it was cooked through and it looks like a combination of both.

Just cooking the other limb to match now.

I’ll back it, options are; Ash, bamboo, sinew. What do you reckon?don’t think the bamboo will work without deflexing it in the middle.

The last photo is of the decrowned back
. The photo of the burner is just when I set it up, it was about 6” away in the end

I’ll get this thing sorted one day. I think I need a larger burner with more hole, there or four rows, and less flame per each hole.

jameswoodmot:
Couldn’t help myself, got a slat of black locust cut and planed. Any reason that’s a terrible idea?

I’ve also cut another piece of elm, a little shorter than the original, to continue with the plan. I’ll just not be heat treating it with gas 😂

jameswoodmot:
Too slow I did it anyway


One heat treated elm/ black locust stave.

I’m have zero investment in this, I might work but I’m not 100% about the backing strip, got a pin knot in it that I didn’t realise until I was flexing up was on the back side of the strip not the belly side as I had intended for it to be. Just got mixed up.
Glueing with cascamite and I scraped the mating surfaces with a hacksaw blade.

I use silicon spray on the bed of the thickness planer, I ran the glue surface over the belt sander and then scraped and then cleaned with isopropyl. Silicone spray is possible the worst thing for a glue joint so I hope I got it all!

The new elm stave is going to need some work to get it straight

sleek:
Elm makes some of the best bows. Its not a common wood only because of the Dutch elm disease.  Its has an interlocking grain so id wager it makes a fine backing. That silicone spray may be the death of this though, as once its on, nothing removes it. It coats sandpaper when you try to sand it off, only making you grind it deeper into the wood. Perhaps a scraper can scrape off the layer the silicone is one to remove it all the way. Im watching with interest.

jameswoodmot:
Fingers crossed. Good job I have a lot of faith in cascamite. I used a 24 grit 2.5 meter long belt so it’s a lot of abrasive surface area and very aggressive. The bits that come off are more like saw dust than sanding dust, I think I got it off.

It’s got a stupid amount of reflex, I ended up with more than I expected in the elm stave, and I expected the bl backing to straighten it out when I glued it up but it didn’t much at all

If I can get 30lb at 20” I’ll be very happy with it. Then I’ll probably get too over confident and break it 😂

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