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Topic: Bad Vibrations (Read 431 times)
PebblePlacement
Trad Bowhunter
Posts: 109
Bad Vibrations
«
on:
March 20, 2013, 11:06:00 PM »
What is causing my newly handcrafted bow to vibrate so much?
What can i use to dampen it?
Did i make a mistake along the way?
Is this common?
Logged
=>>>====> MW <====<<<=
bowslinger
Trad Bowhunter
Posts: 543
Re: Bad Vibrations
«
Reply #1 on:
March 21, 2013, 01:02:00 AM »
A few pieces of information may help. What style of bow? Recurve, Hill-style longbow, modern relex-deflex longbow; draw weight, total arrow weight (with point. Do you shoot low wrist, high wrist or somewhere in between?
I am sure there are some here that could help you figure out the problem with some additional information.
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Hunting is the only sport where one side doesn't know it's playing - John Madden
Walt Francis
Administrator
Trad Bowhunter
Posts: 3094
Re: Bad Vibrations
«
Reply #2 on:
March 21, 2013, 01:42:00 AM »
First, set the nock point and adjust your brace height to the point of least vibration. The brace height will vary with every bow, even between the same makes and models. That usually takes care of 90% of my vibration issues.
Logged
The broadhead used, regardless of how sharp, is nowhere as important as being able to place it in the correct spot.
Walt Francis
Regular Member of the Professional Bowhunters Society
Pheonixarcher
Trad Bowhunter
Posts: 1224
Re: Bad Vibrations
«
Reply #3 on:
March 21, 2013, 02:12:00 AM »
Also, how new is the build? If it is a self bow or flat bow, the limbs may take a while to get "shot in". Once they get a hundred shots or so, they tend to settle down a bit. I'd also recommend playing with brace height, nock point, string material and silencers, and using as heavy an arrow that you can with a tolerable cast.
Logged
Plant a fruit or nut tree today, and have good hunting tomorrow.
=}}}}}-----------------------------}>
PebblePlacement
Trad Bowhunter
Posts: 109
Re: Bad Vibrations
«
Reply #4 on:
March 21, 2013, 07:18:00 AM »
Just finished the major tiller, rasp the whole way through.
Untested Long bow feels like 50# with a shelf cut half of a 5/16 arrow past center
60" unstrung and a 60" 14 strand B50 string.
Bracing right now at 8", i draw to 26.5"
Split finger.
28" handcrafted untested maple shafts. They feel like a 1535 i think. Burnt tip points for now
(waiting for a delivery (100gn) .)
Havent tried string dampers yet...
The arrow weights 247gn. fletched and untipped.
Logged
=>>>====> MW <====<<<=
L82HUNT
Trad Bowhunter
Posts: 646
Re: Bad Vibrations
«
Reply #5 on:
March 21, 2013, 07:45:00 AM »
Brace height is high for a longbow
Arrow is really light unless you have a 200 grain tip on it
B50 in general will have more vibration the a FF type material
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PebblePlacement
Trad Bowhunter
Posts: 109
Re: Bad Vibrations
«
Reply #6 on:
March 21, 2013, 07:59:00 AM »
Ouch, thats the longest string i have right now...
Logged
=>>>====> MW <====<<<=
RedStag5728
Trad Bowhunter
Posts: 315
Re: Bad Vibrations
«
Reply #7 on:
March 21, 2013, 08:15:00 AM »
What length is your bow and string? for a longbow the string is usually 3" shorter than the bow is. For instance if your bow is 64" (like mine) then a 61" string is pretty ideal. However I really don't go by length I solely rely on brace height. Right now my store bought FF endless string is 61" and my brace height is somewhere around 8 1/2" which in my opinion is too much. So I made myself a B50 FS and adjusted (twisted) until I got my brace height set at 7".
Logged
Randy
CTA RedStag LB 64" ntn 57# @ 28"
Hickory SB (#2) 64" ntn 43# @ 28"
Hickory East Woodland SB 65# @ 27"
Darkside Laminated LB 50# @ 28"
Darkside Laminated LB 37# @ 28"
LBR
Trad Bowhunter
Posts: 4221
Re: Bad Vibrations
«
Reply #8 on:
March 21, 2013, 09:33:00 AM »
Arrows way too light for one. A "FF" type string should help also.
Logged
njloco
Trad Bowhunter
Posts: 2357
Re: Bad Vibrations
«
Reply #9 on:
March 21, 2013, 09:43:00 AM »
The shafts can't be like a 1535, I shoot 1535's out of all of my bows with no vibration ( LB's and curves ), heaviest being 54#. My arrows are 29"L, 5' feather, 50gr. brass insert, and 125-175 gr. field pt. or broad heads. Your string is the wrong size.
I'll also add, that if I ever tried to make a bow, I'd probably end up with a tooth pick, and that is if I was lucky. So my hat is off to you for doing it no matter how it turns out.
Logged
Leon Stewart 3pc. 64" R/D 51# @ 27"
Gordy Morey 2pc. 68" R/D 55# @ 28"
Hoyt Pro Medalist, 70" 42# @ 28" (1963)
Bear Tamerlane 66" 30# @ 28" (1966)- for my better half
Bear Kodiak 60" 47# @ 28"(1965)
kat
Trad Bowhunter
Posts: 1413
Re: Bad Vibrations
«
Reply #10 on:
March 21, 2013, 09:54:00 AM »
I agree that the brace height is too high, but from the information we have, the arrow weight is at least 1/2 as much as it should be.
If it were me, I would start out with about 450-500 grains total arrow weight as a minimum.
Good luck, and hang in there.
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Ken Thornhill
Bladepeek
Trad Bowhunter
Posts: 3318
Re: Bad Vibrations
«
Reply #11 on:
March 21, 2013, 11:25:00 AM »
If the bow really is somewhere around 50#, you are shooting something like 5GPP arrows. I would guess it really vibrates! As kat said, that's half the weight arrow the bow should be seeing (at a minimum). I'd get the arrow weight up to 500gr and see if that doesn't help a bunch.
Logged
60" Bear Super K LH 40#@28
69" Matt Meacham LH 42@28
66" Swift Wing LH 35@28
54" Java Man Elk Heart LH 43@28
62"/58" RER LXR LH 44/40@28
PebblePlacement
Trad Bowhunter
Posts: 109
Re: Bad Vibrations
«
Reply #12 on:
March 21, 2013, 06:41:00 PM »
Thanks so much for everyones input... Some great info folks.
Logged
=>>>====> MW <====<<<=
Bladepeek
Trad Bowhunter
Posts: 3318
Re: Bad Vibrations
«
Reply #13 on:
March 22, 2013, 11:14:00 AM »
Be sure to tell us what you find when you've experimented a bit!
Logged
60" Bear Super K LH 40#@28
69" Matt Meacham LH 42@28
66" Swift Wing LH 35@28
54" Java Man Elk Heart LH 43@28
62"/58" RER LXR LH 44/40@28
**DONOTDELETE**
Trad Bowhunter
Posts: 10441
Re: Bad Vibrations
«
Reply #14 on:
March 22, 2013, 09:44:00 PM »
Quote
Originally posted by PebblePlacement:
Ouch, thats the longest string i have right now...
a lower brace height is not going to help your vibration.
have you mapped your limbs yet, and made sure the limbs are bending the same?.... balancing the working portion of the limb and getting the profile as close to the same as possible will effect vibration the most. the same profile will help balance the mass weight in the outer portion of the limbs.
next would be your string tension at brace being too low. a higher brace can help a bit with that, but not a lot....hope that helps... I'm not much of a self bowyer personally, but you may try flipping the tips a bit to increase the preload.....kirk
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PebblePlacement
Trad Bowhunter
Posts: 109
Re: Bad Vibrations
«
Reply #15 on:
March 22, 2013, 11:53:00 PM »
I am making 11/32 shaft woodies tommorow. I had jumped the gun on the bow and did this special custom finish i was eager to try on it, but i rasped somemore tonight... I think with the new dynamic to the limbs and the heavier arrows this puppy is gonna go like a rocket!
(if my thin shelf holds)
Logged
=>>>====> MW <====<<<=
heartlandbowyer
Trad Bowhunter
Posts: 664
Re: Bad Vibrations
«
Reply #16 on:
March 23, 2013, 12:25:00 AM »
How about a pic or two, braced and full draw.
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PebblePlacement
Trad Bowhunter
Posts: 109
Re: Bad Vibrations
«
Reply #17 on:
March 27, 2013, 07:35:00 AM »
Do pictures need to be uploaded from a site? Can i just display pictures from my computer?
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=>>>====> MW <====<<<=
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