Primitive Archer
Main Discussion Area => Bows => Topic started by: Capt on October 02, 2013, 02:51:36 am
-
A couple of questions -
I recently finished my 2nd bow (an 63 ntn 60#@28" Osage recurved tips) as some probably know from recent posts..... when fist finished before adding a rattlesnake skin backing is was shooting super sweet... i mean silent as i remember...
i was shooting coconuts at 20+ yards and the release was almost silent with no hand shock as far as i noticed, and the impact on the coconuts was real quiet as they still had their fibrous husks.... so no sounds or shock......
Before backing with the skins i heat treated while the bow was clamped flat for two reasons really, 1. i wanted to remove a tiny bit of set that the bow seemed to take after shooting it in and 2. because i thought it could up the poundage slightly.. i did the heating prior to backing as i knew i couldn't afterwards without compromising the bond of the backing adhesive....
Well after the heating and backing i left it to sit unstrung for 48 to 72 hours then braced it for some pics... another 24 hours before i shot another arrow....
When i got to shooting i noticed the string seemed to twang on me... not really hand shock so much more like a noise i never recall hearing? maybe a little vibration in the hand..... but more than anything the twang of the string seemed weird..... (the knocking point on the string also seemed to be 1/8" lower???)
i checked the weight and tiller again and the tiller seems fine but it seems to have gained at least 5# of draw weight (i assume this is the backing, heat treating or combination both?)
So my questions are:-
1) Do people think the twanging will go away as i shoot the bow back in?
2)What is Normal in these circumstances?
3)What can i do about it if the twang persists?
i thought to lighten the tips somewhat... as you can see in the pic i left the recurved section of the tips kinda beefy... would removing some meat from the tips help?
i also thought of adding Lynx (bobcat) or badger skin string silencers?
I'd really appreciate peoples thoughts and advice...
Bests to all,
Capt ;)
-
It could be several things. My best quesses are:
1- Did your bowyers knot slip slightly? (check brace hight). To solve this try and experiment by twisting the string to increase brace hight slightly until you hit that "sweet spot".
2- Tiller changed slightly, as a result of heat treating and your attempt to correct set, affecting the timing of your limbs. Check the tiller and correct by removing wood.
Just my two cents
-
+1 on checking brace height
-
I would also guess the brace is to low, and reset you knocking point, string is probably laying on the curves on the re curved tip's a bit more since you added more reflex. :)
Pappy
-
Capt, when you added weight from the heat treating, which had to be near handle to mid-limb, you added extra stress/bend to the outer limbs. I went back and looked at your finished bow thread and you can see too much upper limb bend from mid-limb to tip. This will cause limb deformation/bounce/vibration. Would cause the string nock to move down also...........Art
-
To help we could do with a new full draw picture and a picture of how the limb width tapers.
I 've just had a look at the full draw picture you added before and it appears that it is bending a little too much about 2/3rds of the way along the upper limb and a shade flat leading into that section.
Vibration is almost always something to do with limb timing.
I agree with what the others have said about checking brace height and re-adjusting nocking point, it should ,give or take , be an 1/8th inch above horizontal with the arrowpass.
String silencers should be seen as a last resort in my opion ;) once the tiller and limb timing is perfect the bow will be silent (or near enough) anyway. Get it to this stage and then add them if you want.
Your limb thickness around the recurves doesn't seem excessive and is very unlikely to be the casue of the issues you are having.
When i've heat treated osage i've never really had an increase in weight, my suspision is that the increase in weight is due to it drying fully after the heat treatment. Remember it checking before.
-
Definitely your brace height is low. Unless you're using a FF string, it's probably stretched a bit and your BH has dropped. I always check my BH every time before I shoot any of my bows. Only takes a sec and then I know. For recurves (and the majority of my bows for that matter), I keep my BH at 7". That's measured from the back of the bow. If your BH is too low, the bow is very noisy, and it really whacks the inside of your arm.
-
I also suggest examining your grip. If your bow isn't sitting in your hand just right it will want to fight you above or below the grip causing a loud, shocky shot every time. Self bows are difficult to shoot compared to any other bow out there.
-
Thanks Guys,, heres some more info for you all... again the bow is 63"NTN and at my full draw hunting style its 55#@26"
the Brace hight ive been using is the tip of my thumb from the base of my fist...or 6"
I made a video of me shooting 12 arrows with a more perpendicular style stance and took stills from the video.... Here are the results...
BTW it already feels much better today but here are the FD pics anyway...
Bests and thanks again... ;)
-
See that big flat spot on the top limb? That in essence creates a bunch of dead limb above it. That may be your problem.
-
Here's a better view. Tiller is off, plain and simple. Looks like a hinge starting in the upper limb from mid-limb to tip...........Art
http://www.primitivearcher.com/smf/index.php?action=dlattach;topic=42550.0;attach=91912;image
-
Pearl Drums and Artcher1,
Big thanks,,,, i identified a slight stiff spot in the upper limb as you both rightly spotted... i'm sure it wasnt there before the skin job but hey?
i noticed also at that spot on the limb one of the sides was less rounded by quite a degree than the other, i'm pretty sure this happened when i was filing off the excess skin and glue with my metal file.....
Anyway i rounded the edges in that spot symmetrically and thinned roughly one thin growth ring from arround 6" of limb in that area with 120 grit sand paper... the tiller looks spot on once again......
I re braced a little higher at 6 5/8" and shot a few arrows at my 26" draw............. whalah!! it's silent and no hand shock what so ever.. ;D :D :laugh:
i checked draw weight and its still over 50#@26" i'm sure still close to 60#@28" although i never drew it that far to check....
Big thanks.... Happy camper here once again...... ;)
You guys are the best.....
Heres a pic of the area we identified that i re-worked.... I'll post another full draw later when i get chance... got to get off to work going finishing... i have tails to chase / Marlin to catch..
-
Right on.
-
I have a sneaking suspicion due to your personality you'll be building quite a few more bows in search of that "perfect" bow.....keep on building and you'll find it eventually.... I haven't found mine yet tho :laugh:
-
It's the Zen of bow making. It's like surfing the perfect wave, or hitting the perfect shot in golf... it's what keeps us going, and keeps us striving to improve.
I think you'll do well at this. You have a good eye, and you're willing to listen to valuable advice. Journey well!
-
Is there a perfect bow?? Good luck with that yall O:)
-
Definitely Agree... Both making and shooting (instinctively) Bows takes skill and focus....
its not like were just making stools or wooden spoons....
To Me well made Bows are masterfully crafted feats of engineering that take knowledge understanding and valuable traits to produce... Skill patience and a thorough understanding of the craft are all key...... Such a shame that so few people appreciate what it takes... but hey who cares... its not like were doing it for anyones approval or praise... its a personal thing for me a feeling of self achievement... ;)
Love it...!
-
Ding-ding-ding Capt. That was a great descriptive.
-
... but hey who cares... its not like were doing it for anyones approval or praise... its a personal thing for me a feeling of self achievement... ;)
Give the boy a cigar!
-
Definitely Agree... Both making and shooting (instinctively) Bows takes skill and focus....
its not like were just making stools or wooden spoons....
To Me well made Bows are masterfully crafted feats of engineering that take knowledge understanding and valuable traits to produce... Skill patience and a thorough understanding of the craft are all key...... Such a shame that so few people appreciate what it takes... but hey who cares... its not like were doing it for anyones approval or praise... its a personal thing for me a feeling of self achievement... ;)
Love it...!
HE GETS IT!!!!
Forget the cigar send this man another stave!
Now, take a game animal with one. That's a worth while achievement as well.
-
Pearl Drums and Artcher1,
Big thanks,,,, i identified a slight stiff spot in the upper limb as you both rightly spotted... i'm sure it wasnt there before the skin job but hey?
i noticed also at that spot on the limb one of the sides was less rounded by quite a degree than the other, i'm pretty sure this happened when i was filing off the excess skin and glue with my metal file.....
Anyway i rounded the edges in that spot symmetrically and thinned roughly one thin growth ring from arround 6" of limb in that area with 120 grit sand paper... the tiller looks spot on once again......
I re braced a little higher at 6 5/8" and shot a few arrows at my 26" draw............. whalah!! it's silent and no hand shock what so ever.. ;D :D :laugh:
Told ya so!
Glad it's working for you now.
-
Forget the cigar send this man another stave!
Yes get this man a stave... :D
I'm down here in mexico and getting a good bow stave was tough last time..... i really want to get more Osage but finding a dealer can be tough... Who do you all recommend? i only need them to be able to ship to San Diego... i have a contact there that can jump me stuff over the border and forward to me here in South Baja.....
I'm ideally looking for something clean to make myself a nice Mollegabet or something that will make a good character Bow Snakey would be cool...
Who deals in good seasoned Osage..... Any Clue
-
Dean marlow
Or
Carson @ echo archery