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When the tillering goal is no set
superdav95:
--- Quote from: willie on November 30, 2024, 06:36:12 pm ---
--- Quote from: superdav95 on November 30, 2024, 12:03:50 pm ---I like to creep up on it doing the basics.......
Avoiding early mistakes.......
--- End quote ---
Early mistakes are easier to see in simple bends.
When the limb has more complex shapes, ie deflex recurve/reflex or uneven limbs, The bowyer seeing the bends look even or consistent doesnt neccesarily mean the stresses are'nt getting to high someplace. Should a highly stressed area show set, well then we know, but I am hoping to find a way to see it coming before the set occurs.
How often have you lost alot of that nice "early draw" weight that makes for high string tension at brace, before set becomes apparent?
--- End quote ---
you are right willie. more complex builds change things a bit. Especially with an unbraced profile that is filled with character for example would be more of a challenge for sure and this is where experience kicks in. The best way to get that experience is to build lots of bows and not be afraid to break them testing the limits an get a feel for it as well as an eye for good tiller. as an aside here i recently have been learning a lot more then previously thought about bamboo for bows and how to better tiller them. The lesson here for me is I guess we should never settle and always strive for better and possible new ways that may be an improvement albeit minor to what we have been doing. I came into bowmaking with no prior knowledge of working with wood or bending it. I had no pre conceived ideas or expectations. A buddy of mine made bows and I tried to trade hime a custome knife for one of his bows. I was surprised when he said no and said why dont you just make your own bow? Ive not looked back and still love it. There have been many one here and elsewhere that have helped me over hurdles that came up on various builds and learned a ton from this community. I do try to give back where I can to those i can. Wille you asked how i creep up on it on my builds and I would say that the yardstick method works well for me. I built my trade bow this year out of a very wonky yew stave that needed some taming. This bow went to Will B and it shot well and took very little set if any. I used the yard stick method on this build early on to get me to good clean brace. Once there i knew i was headed in a good way with this bow. I also paid very close attention to all the dips and hills and twists on the back to match them on the belly. I had a large cluster area of harder pin knots that had to be accounted for also as they dont bend the same as regular wood. I considered this bow a challenge and a joy to build and glad it went to Will. The yardstick method bassically takes overall bend of each limb independently for consistent bend and then comparing them with each other. using the straight edge of the yardstick laid accross the belly of the bow while bent to get a good view of the bend early on has helped me creep up on it. it dosent have to be a board bow either. Ive done this with character builds just fine and works especially well. I now use this method with my boo builds too. hope this answers your question Willie.
willie:
thanks for taking the time to share, Dave.
I have been searching through some older posts that Steve (Badger) posted a while back. He developed what he called "no set tillering", and I even tried it a few times with some moderate success. Like most methods, there are judgements to make about how much and when. Perhaps I should do some test tillering to quantify just how much to back off my draweight goals when the method dictates.
http://www.primitivearcher.com/smf/index.php/topic,61588.0.html
stuckinthemud:
I try to get an even bend from the very beginning, bending the bow as little as possible. I can usually get to brace with no set by creeping up on things using gizmos but I really really struggle past 20”. Partly I think I might lose a little patience and start to rush a little bit but I also wonder if I tiller for too long and fatigue the wood. I definitely use wood with too high a moisture content I definitely do damage stringing the bow, more than once I have taken a bow past the point I have tillered to to get the string on
Eric Krewson:
I don't get in a hurry tillering a bow, it is a week project of shooting and checking for the slightest anomaly with my gizmo, I am only using 220 grit sandpaper at the end of the tillering process. I do reflex the limbs with heat before I floor tiller and have done some belly toasting on the last 5 or 6 bows that I made. I glue 2 1/2" of reflex in my bamboo backed osage bows on glue up, shot-in they are straight limbed or have about an inch of reflex. I can't explain my method for making these bows because it is mostly the way they feel in my hand at the shot and what my gizmo tells me. My design is always the same because it works, 64" NTN, 1 1/4" wide limbs with a slightly rounded belly transitioning to a round belly cross section about 8" from the tips
These are my personal bows with over a 20-year span, I have reworked a couple of them that had been shot tens of thousands of times and had some set, these were poundage drop rebuilds because I could no longer shoot them in my old age. I treated these bows like they were a new build with reflexing, wood removal, re-tillering and toasting the bellies.
The upper stactic has been my go-to bow longer than any other, at least ten years of constant use. It is still a great shooter but I may give it a lower poundage rebuild and resurrect it someday.
The third bow down is 20 years old and was made from the best osage I ever worked on, just a splinter with 13 small drying checks down the back that I filed with superglue. It has never had a heat gun on it and has the most rounded belly of any of my bows. It is 62@25, way too stout for me now.
The majority of the bows were made from that special osage I mentioned, I cut all of my osage in front of a bulldozer over the years so I couldn't be picky but knew when I found the great stuff.
superdav95:
Very nice Eric. I bet there’s a lot of trial and error to get to that point.
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