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long bow in progress (Read 6152 times)
vetryan15
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Re: long bow in progress
Reply #60 - Dec 6th, 2019 at 3:39am
 
I hope so, been reading about it. My knife making mentor makes bows, but we never got around to making one before my move. But if i have questions.  He is there to help.
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walter
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Re: long bow in progress
Reply #61 - Feb 17th, 2020 at 7:33pm
 
I just finished a D bow with limbs that pull evenly throughout the draw length, but one limb has slightly more set than the other. Does anyone know which limb should be the top limb? Does it matter?
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joe_meadmaker
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Re: long bow in progress
Reply #62 - Feb 17th, 2020 at 9:55pm
 
Nice!† I'm looking forward to a picture of that one.

The limb with more set I'd probably put at the top.† If your bow has one limb that's bending a little more, that should be at the top.† And reversely, if you have a limb that's a little stiffer, it should be at the bottom.

The reasoning behind this is that the handle of the bow is in the center.† When shooting the bow, the arrow will be on top of your hand, effectively making the upper limb a little bit shorter.† You want the limb that bends more to be the "shorter one" so the stress on both limb is as even as possible.

All that said, if you have your bow set up so the arrow is lined up with the exact center of the bow, then it doesn't matter so much.
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walter
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Re: long bow in progress
Reply #63 - Feb 18th, 2020 at 5:21pm
 
Thanks joe! I place the arrow pass 3/4" above ctr. This bow shoots a little better with the higher set (1 5/8") limb up, but I thought it would be stessed more and develop more set. Seems sensible to shoot the bow the way it shoots best and try to ignore a lttle more set. After all, the bow knows best  Smiley
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walter
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Re: long bow in progress
Reply #64 - Apr 26th, 2020 at 8:48pm
 
string follow or set has been 1 1/2" more or less top and bottom limbs on all my bows. The bows are all 1 1/4 to 1 1/2" wide at the fades. Thought i could beat this much set by going to 1 3/4" wide. Got under an inch permanent set. Over 2" immediate set Sad
This on a 68" n-n self bow. Have decided i must get over the inevitable string follow or be ok with backing bows, which in my humble? op are not self bows.
Below is my latest. It is 1 3/4" at the fades, running paralell past ctr. One half inch at the knocks. Here i am at 48lbs @ 25" with a very little work left to do. This bow ended up at 45 lbs @28" with the set mentioned above. Plenty of hand shock for the first dozen or so shots. By the time i shot it fifty times and was up to 3/4 draw, i could only feel a little vibration.
So, now i am thinking that less than one inch of permanent set may be a good thing even if it is slowing arrow speed. Anyone agree?

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Morphy
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Re: long bow in progress
Reply #65 - Apr 26th, 2020 at 9:18pm
 
Less than one inch is just fine. Itís not a cut and dry answer on this question. You can make a bow with zero set if it was three inches wide and quite long but the mass would kill efficiency. Of course you can also make a bow with very little set with good efficiency but thatís just a process that comes from practice.† A little set could mean you are correctly lowering the mass to be properly balanced with energy storage or it could mean the bow is too dry or the bow is overbuilt. Consider the Traditional Chinese Composite bow. Tons of reflex, garbage efficiency. Itís super overbuilt. Set/reflex isnít everything.

If you donít have it already consider looking into the Traditional Bowyers Bible vol. 4 and reading the chapters on heat treating, the mass principle and proper tillering techniques based on the front view profile of a bow. Thatís a good introduction to getting efficient bows.

Thatís a fine looking bow Walter. Well done man!
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walter
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Re: long bow in progress
Reply #66 - Apr 26th, 2020 at 9:29pm
 
Thanks Morphy  Smiley
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