Primitive Archer
Main Discussion Area => Bows => Topic started by: Parnell on October 04, 2017, 01:07:10 pm
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Almost done with my first hollow limb effort, almost done. The bow is pulling nicely. Just needs finishing. Here are a couple teaser shots.
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Very nice looking work Parnell. I like that handle design
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Very nice looking work Parnell. I like that handle design
Thank you kindly, Clint. I do believe I've taken some cues on that from your work. ;)
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That's a tease for sure, but knowing your work I'm sure this one'll go down in the books. Looks awesome so far.
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Beautiful work. What is the purpose for scooping the limbs like that?
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Looks really nice.
I'm sort of wondering how durable such a design is. I heat-treated an old HHB bow with fairly wide, thin limbs many years ago and the end result was essentially a hollow limb bow. When I braced the bow and tried to pull it back the limbs split right down the middle from fades to nearly the tips.
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Lookin good Steve! I did a mild hld static a couple weeks ago. I like it a lot! Yours is hollowed out more than mine though. I had a slight crown to work with
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Damn Steve that's looking good ....the tease worked ....:)
Your stuff Flintnapping & Bow work is really looking good lately.... way to go!....
Will H why don't you post some of your work anymore??
DBar
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Marc, I had the same exact thing happen to me a while back. I had spent many hours hollowing out a highly-crowned character stave, from an Osage sapling pole I felled, and when I started bending it, I kept hearing little ticking sounds. Sure enough, that thing split right down the center of the limbs. I just sat there looking at it completely deflated. But I will say that I had wondered prior to that build, what would keep a wooden bow limb from suffering the same radial grain line checking, that occurs when felled logs are left full-round and unsealed. When you cause the crown of the limb to flatten, every one of those radial grain lines are trying to pull apart along the belly.
-That said, I have made a couple of slightly HLD (shallower in the belly) bows - one Osage and one CrepeMyrtle shorty - that did just fine. I like the idea and the science behind it, not to mention they look sexy, but once you see one split itself in two, it kind of makes you take a step back.
-John
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Looks good! what kind of crown are you working with?
That's interesting, Marc. I see what you're saying. Something to think about. I wonder if Simon has experienced that. He's made quite a few. I wonder if certain wood types hold up better to that particular kind of strain and others don't.
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l love the look of the handle. I am also wondering whether certain woods are more suitable for such a deep HLD design than others. I can totally visualize what Marc and JohnL are saying. One way to figure out the radial tension would be to apply a strain gauge, but I have only dealt with them for larger structures so I would have to research it a bit on whether they are available for something the size of a bow.
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Looks really nice.
I'm sort of wondering how durable such a design is. I heat-treated an old HHB bow with fairly wide, thin limbs many years ago and the end result was essentially a hollow limb bow. When I braced the bow and tried to pull it back the limbs split right down the middle from fades to nearly the tips.
It's certainly crossed my mind, as well. Especially putting in the extra time on the hollow limb. It's been done primarily with a goose neck scraper. I'll need to get a better tool if I intend to make more. That goose neck is tough on the hands.
I'll be interested to see how it holds up, Marc. It's going to my buddy as a gift.
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Looks good! what kind of crown are you working with?
That's interesting, Marc. I see what you're saying. Something to think about. I wonder if Simon has experienced that. He's made quite a few. I wonder if certain wood types hold up better to that particular kind of strain and others don't.
Thanks, Weylin. Not much crown. It'a a 4 year old stave from Kansas. Good Osage with one clean knot on the lower limb. We'll see how it does.
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I love hollow limb design but I like to keep the centre a little thicker than the edges. I've only used it on high crown timber though.
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Damn Steve that's looking good ....the tease worked ....:)
Your stuff Flintnapping & Bow work is really looking good lately.... way to go!....
Will H why don't you post some of your work anymore??
DBar
Thanks for the compliment, Bill! I feel a lot more focused these days. ;) ;D
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Looks good! I think the essential part in HLD bows is that the hollow shape follows the crown and that the sides are thinner than the middle so the stresses from drawing the bow can redirect to the sidewalls. According to Simon the limbs even flatten out a bit at full draw. I think this flattening should occur from the sides coming up a bit, essentially directing the compression forces away from the middle. (I hope this makes any sense, kinda hard to put this in words) I am almost finished with a 60 lbs elder hollow limb where I really payed attention to the sidewalls compared to the middle section, will probably put on some pics in a week or so.
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Something just occurred to me with this talk of the HLD talk and the relationship between the hollow portion and thickness of walls.
When I went through this I hollowed out the limbs before I tillered them. The walls of were significantly thicker before I tillered because I really didn't tiller the bow by scraping thickness from the bows belly...as I normally would. I tillered the bow by essentially scraping the backs edges and sides as if I were "trapping" the bow.
Hmmm, it'll be interesting. It's fun to have a "new" mission to work through.
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You caught my interest, Stephan.
I have never done a HLD like you decribed - scraping back edges.
Leon gave a good explanation above.
I think, to get the full benefit of a HLD you have get the limbs flattening out. Otherwise you get"only" the mass minimized - which is a lot for itself.
But the flattening out has an effect on the behavier of drawing (flatter curve in the outer draw) and also in stress minimizing.
If you have interest in my article it is here: http://primitive-bows.com/hld-a-new-progressive-design-for-selfbows/
Please keep us updated, I personally just curious what you get. HLD is most efficient design I know.
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You bet, Simon. This bow will be wrapping up soon. Thanks.
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Finished. I’ve decide against wrapping the handle. Shipping this bow out as the gift I missed giving because of Hurricane Irma. So, the bow has been named Irma. My scale is screwed so not exactly sure but she is definitely closer to 60# at 28”. Lots of strength for a fairly slender lady.
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I finished it using Clint’s automotive wheel finish idea. Super good.
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That turned out great! Beatiful bend on that one! I gueass it is pretty smooth and fast!
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The bow shoots fast and hard. To the point that I went back and made a slower b-50 string. I like it better on this bow. I’m amazed at how strong the bow stayed in design. On to another hld, but am at least flipping tips on the next and will push it harder.
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Yeahhh!
That's a good piece of HLD, tiller is simple perfect
How long is the bow?
Make a 6 strand string out of BCY 452x and you will be happy!
Any chance for a chrony?
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Thanks guys. I like the tiller.
Simon, I don’t have a chronograph but we might be able to make that happen in Nashville...the bows future home. I’ll see what we can do. Also, the bow is 64” total.
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That tiller looks absolutely dead on. I love everything about this bow. (-S
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Beautiful bow!! How thick is the limb if you ignore the hollow area while measuring. Very impressive!
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Really impressive work Parnell. The tiller looks great. I hope to see that one in the BOM contest.
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Beautiful bow!! How thick is the limb if you ignore the hollow area while measuring. Very impressive!
I'm humbled by the compliments, a sincere thank you guys.
Steve, the bows back is slightly convex and as I wrote earlier, after I hollowed the limb I tillered in part by trapping out the sides...so the sides of the back are softened. That said, out of the fade 9/16, 7/16 at mid-limb, 5/16. The last 6" I scraped flat to thin tips.
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Do the limbs flatten out at draw any?
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Do the limbs flatten out at draw any?
In cross section? I don't know...
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Steve, before you send out:
What is the mass? Maybe Badger can check the mass theory ...
What also would be interesting is the draw curve, I usually take measurements every 2"
If you like to check the flattening out:
Brace the bow, hook the string in the handle (handle straight downwards) of the vice, pull with right hand at bows handle. Now you have the left hand free to let it walk along the limbs and feel if it goes or where it is more or less.
Again, that bow is georgous!
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Let me see what I can do Simon...
I think there is a used marine equipment store, perhaps they have a scale for me.
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You caught my interest, Stephan.
I have never done a HLD like you decribed - scraping back edges.
Leon gave a good explanation above.
I think, to get the full benefit of a HLD you have get the limbs flattening out. Otherwise you get"only" the mass minimized - which is a lot for itself.
But the flattening out has an effect on the behavier of drawing (flatter curve in the outer draw) and also in stress minimizing.
If you have interest in my article it is here: http://primitive-bows.com/hld-a-new-progressive-design-for-selfbows/
Please keep us updated, I personally just curious what you get. HLD is most efficient design I know.
Very lucid article... s'pose I've got to make one now ::)
no peace for the wicked >:D
Del
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Beautiful bow. Nice work
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Very nice Steve,Beautiful work, tiller looks great and very different for sure. :)
Pappy
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Very impressive Steve :OK
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(A)
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Having trouble with the full draw picture being orientated upright...
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Is anybody else noticing their pictures being 90 degrees off when they post?
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Only when I go on , on my phone. Looks good from here. :)
Pappy
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Wow nice bend on that one Steve....
DBar
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Very very nice well executed my friend
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Ok very nice . At the first full draw pic the outer limbs looked way to stiff. The second though looks very good. Guess one of those camera things. Arvin
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Another one I missed, very nice bow Steve. That is a beautiful bend.
Bjrogg
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Hey thanks! Sheesh, it's been awhile I've kinda forgotten about this!
I'd made this bow for Cody Scott as a wedding present and delivered it to him up in Nashville about a month ago.
That bow is about 62#@28"...without much wood!
The outer limbs were getting down right small but still holding tight. Looking forward to doing another this winter but have been moving on some other projects, lately.
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Tiller is spot-on brother !!! Great job !!