Primitive Archer
Main Discussion Area => Bows => Topic started by: Silver Arrow on October 01, 2008, 09:53:09 pm
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I have recently finished tillering a hickory bow, 50lbs@ 28". Slight problem however, the bow 59" long, 2" wide is taking on set. Is there anything that can be done to stop and correct the set? Do I have to back the bow to correct it? If someone could give me some advice that would be exellent, thanks.
Jonathan
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Sinew backing would probably help some. Also heat treating the belly and drawing it into reflex could help some. The wood may still be a little damp hickory draws moisture ? Unless it's a recurve I'd say the short length is where most of the set is coming from though.
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Usually once set is there, it's pretty much there. The wood cells in the belly have already collapsed from compression stress. Heat treating the belly into reflex may help a little, but it helps more if you do it earlier in the process. How much set does it have? Set is inevitable in wooden bows-that's why many people reflex the stave a couple inches before tillering so that after it takes its set, it will still be straight. Some causes of excessive set are high moisture content (especially in hickory and other white woods), uneven tillering, stressing the bow too much during tillering (going too fast, pulling the bow too much with uneven tiller, pulling it past the intended draw weight, etc) or improper design. 59" is pretty short for a hickory bow with a 28" draw, but at that width, you shouldn't get more than a couple inches of set unless the wood is too wet or it was stressed too much. Hickory is really hard to get dried out, it soaks up moisture like a sponge in high humidity.
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Put it up to a learning experience and move onto the next bow. Make sure to build a drying box and put the wood in there to bring the moisture in the hickory down. Once you seal the bow after building it will be slower to take on moisture. Good idea to pop it into the drying box every once in a while to draw down the moisture again. Especially if you live in a wet moist climate.
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If you are working with hickory you are going to have set, unless you live in the desert. How much set does it have? one inch or 2 inches isn't much. Even four if it shoots good. A lot of people get bent out of shape when it comes to a bow taking set. It's not that big of a deal, they all will do it unless it is an overbuilt slug.
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It's kind of funny years ago I can remember guys talking about set and most all of the bows you seen had some set but now with the info that is availible on the web and such most of the bows you see have reflex or alot less set than they did years ago..
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Unless you soak them in saltwater and back them with two pounds of Buffalo rawhide ;D. Sorry, couldn't help it. ;)
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;D
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How much set? 59 inches is pretty short for a 28 inch draw bow of most woods. Next time make it longer. :) Jawge
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Well... my bow has about 2 1/4 inches of set on each limb. I live in Southern Ontario and we have had a really wet year so although i let the stave dry for a year and a half it likely was slightly wet. It is my second bow and it seems to shoot beautifully- so far ;). So on my next bow i will make sure it is really try before and while i tiller it. Should I make my next bow longer and wider? Is there a good kind of bow wood that does not soak up as much moisture?
thanks
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2 inches is good for a width but you needed longer. Jawge
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A crowned back and flat belly will help reduce set as well.
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Ipe and Osage don't soak up as much moisture or so i've heard. I've not used either one personally. Usually I'm proud if my bows take less than 3" here after they are a year old. We have really dry times here and really wet ones it's really unpredictable.
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Typically, a crowned back adds set. That's been my experience. For example, when I make a sapling I'll leave it an inch or 2 longer than normal to counteract the set the crown would add.
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The bow I'm hunting with now is 64# @ 28" and has 2" of set. The difference is that it is longer(66") and the same width. I love shooting it and actually prefer it to some of my other bows regardless of the set. If it shoots good and your comfortable with it then enjoy it.
Tracy
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You could steam and reflex the handle a few inches, and make yourself a dandy little reflex-delfex double curve. That's what I'd do.
~~Papa Matt
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I've only used osage so I can't speak about Hickory, but you still get some set on unbacked bows. I like to hang them up and look at them as much as shooting them
and I like to see them straight. I'm in agreement move on to the next bow and put reflex in next time. I know I sure had some bad set in bows just chalked it up to experience. Dismount