Primitive Archer
Main Discussion Area => Bows => Topic started by: BOWMAN53 on October 15, 2012, 02:55:27 am
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I don't remember feeling any chrysalys when I sanded it down but after staining and three coats of clear I can feel "little spikes". Any clue what happened?
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The crysals may have developed after ,or they may have been small andkind of stretched back into shape enough that you wouldn't notice. The clear coat isn't flexible ,so when the bow was flexed it "crumpled" at the site of stress. When the bow straightened the "crumpled area was no longer adhering to the wood,forming spikes. That's one scenario. It could be that they aren't crysals at all, and just finish incompatibility. Have you checked your tiller to see if it is weak or hinged at the site?
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They were there before I braced for the first time after the clear dried an hour later. After I braced it, it did make more pop up so I guess your right about it "crumpling". And the tiller is fine, top limb is a little bit stiff but nothing major.
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Coats of stain and finish make them more visible. Jawge
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Exactly what Jawgey Poo said. I have heard alot about cracking finish. I have built close to 100 bows all the while using at least six different types of sealers from dipping and rubbing to spray on. None ever cracked, and patience isnt my strong suit so you can guess I jumped the gun on the drying process a time or two.
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When sanding it down, you should do it out in the daylight, n use acetone or denatured alcohol after the last couple fine grits. And look it over verycarefully a thousand n one times. The solvents will highlight any left tool marks or if you have any frets that had popped up and you missed. That way you know what it looks like before you seal it. Although a bow can fret after sealing as well due to a number of different reasons.
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If you can feel the chrysals then they must be quite pronounced. Chrysals can be seen more than felt
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Thank you for the info and the tips, llI remember it for the next bow. For now I'm just gonna sand it down with some fine grit and put one more coat of clear to make it shine again.
I used to work in a body shop and my job was. Prep and detailing and something as tiny as a piece of dirt can leave a very noticable mark.
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Don't sand chrysals. Makes them worse. That area is bending too much. Remove wood from above and below leaving the chrysalled area alone. Show some pics to be sure. Jawge
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Its all along the limb, both of them.
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I wasnt planning on sanding all the way down the to wood. I'm not gonna go through the clear at all just enough so you can't feel them.
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Is your made of black locust by chance? I think some more info about your bow will help us help you better. Wood? Dimensions? Draw weight and length? And pics of your tiller?
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Chrysals localized in one spot on the limb indicate a tillering problem where the limb is just bending too much in that area while chrysals spread along the entire limb means a design problem which stresses the whole limb. That could mean the bow is too short or too narrow for its weight. Chrysals usually go across the limb and can be small or large. They are called frets if they are large. I've had both over the years. :) But again we need pictures. Jawge
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I would put up some pics but I don't have a computer and my phone won't let me do it. The bow is hickory. 68" long 1 1/2 wide at the fades tapered down to 1/2" tips. It pulls 25# at 28".
Ill just call this bow done and start on the next one.
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Judging by the spec it should have been more than enough wood for the job.
Could it have been too wet still?
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I feel your pain, my bow for the Red Oak board bow trade did that last night. It was a bendy handle 54" ntn and pulling 43# @28" and was shooting good then I noticed that one or two arrows bounced off the target at 15 yards and when I inspected the belly it had fretted like mad. Frets and chrysals all along the middle half of the bow. It made me sick because it was looking very nice and shooting very good.
Guess I am just not going to be able to make a short bow from Red Oak.
Grady
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Grady, that's an example of chrysals happening because the design is not good. Chrysals are spread out over the entire limb. Pulling a 54" bow 28" is a recipe for having the bow snap in half. Your lucky it only chrysalled. For a bend in the handle bow drawn 28" my minimum would be 64" nth. Jawge
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I know it should not have been that short but I was experimenting and trying to see how far I could push it. That is why I was shooting it a lot to make sure it was going to do what ever it was going to do with me instead of someone else. My next one will be that long. I guess being new to bow making I was trying to feel out the level of ability I potentially have. At this point I am being quite humbled by the wood and am leaning toward being much more conservative. I appreciate your input and valuable experience, It is bowyers like yourself on this board that has fueled my desire to learn and become a better crafter.
Grady