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in reply to: THE WEAK LINK #16012
The yield strength of 6061 T6 Aluminum is very close to that of low carbon steel. It can be higher than some mild steels. 6061 T6 is the most commonly machined alloy for archery equipment.
There are even stronger aluminum’s that could be used for broadhead inserts.
With that said Check out this link, especially the section on impact hardness…
http://www.aldonco.com/Portals/0/docs/AlumvsSteel.pdf
I don’t know if what it claims about impact hardness is true or not (it’s claim 6061T6 is the strongest alloy is false), but it seems true to me, and comports with my experience.
The yield strength of steel actually changes as it is stressed. The more it gets bent, the harder it gets… So when the yield strength of steel is talked about, they talk about the 2% yield point, or something like that. Meaning what is the YS after it has yielded 2%. After that point, it becomes a constant value up to it’s ultimate yield point. I’m digging deep into the dark reaches of days past, so I may not have it all correct here…
Bottom line is that if the steel adapters are not heat treated after manufacture, they could well be weaker than a run-o-the-mill 6061 T6 insert.
Heat treating is cheap and easy. 3Rivers and others should ask their manufacturer to heat treat steel inserts.
in reply to: THE WEAK LINK #14893vintage archer wrote:
Do you recall when you retrieved your arrow if there was any sign the adapter loosened at the insert joint?
How heavy of a arrow were you using and how much wt forward. Just curious.
No way. After it happened the first time, I have always made sure there was no way the arrow would loosen (a loose broadhead seemed like the most likely cause). And I have studied the results when the insert bent, every time. What I have found is that:
1. The broadhead is undamaged
2. The shoulder of the insert is stretched an narrowed on the tension side of the bend.
3. The bend is in line with the plane of the broadhead.
I haven’t mic’d any inserts, but I wonder if the shoulder of the steel adapters is more narrow than aluminum adapters?
I have noticed that the relief between the body of the adapter and the shoulder is 90 Deg on steel adapters and 45 deg on aluminum adapters. I am sure this is a weight reducing measure. But it also reduces the strength of the steel adapters.
My guess is the problem is a combination of poor geometry and low carbon steel.
Arrow wt about 680 grn, FOC about 22%
in reply to: Arrow of Light #14883Here’s another more dedicated site…
in reply to: THE WEAK LINK #13733This is somewhat before my time, so maybe I wasn’t interpreting the picture correctly, but I have seen video of the early screw in points from Bear Archery on some of the old Bear movies. These may be the “answer”
Instead of an #8 threaded shaft used to connect the point to the arrow, it appeared to be closer to the diameter of the arrow. at least a 1/4-32 or maybe even 5/16’s or so. I don’t know what was left to cut threads into in the shaft, but the threaded end of the point sure was big.
I’ve never had an aluminum broadhead insert fail. But I have had 4 or 5 steel ones bend. They always bend in the same place – the shoulder of the threaded part bends.
Joe – The last one that bent was my last little trip in Hawaii when I shot a little piggy. I’d be happy to send that insert to you for analysis (if I can find it). It may be a little bloody 😯
in reply to: Yea,,, I know I'm pushing the limits #12669Very nice Troy.
in reply to: Tuning Thoughts #11468I used to use the brass inserts (and in fact most of my arrows still have them) But recently I have gone back to the aluminum inserts that came with the arrow For 3 Reasons:
1. Cheaper – why pay for something that you get for free with the arrows?
2. More FOC – by going back to the aluminum inserts, I can make my broadheads heavier for the same arrow and increase the FOC just a little bit more.
3. Arrow Footing – I put a 1.25″ (or so) aluminum collar over the end of my arrow shafts which is often referred to as an external footing. This increases the strength of the shaft so that the extra strength of the brass insert is no longer necessary.
Note – the 55-75 shafts are about 2 inches longer than your 35-55’s. I like the extra length. Don’t forget to consider that in your plans…
Ah tink Ah felt ma ears burnen…
We have a fellow that shows up for our Tuesday night shoots with an ACS bow. They really don’t look much different than a normal trad bow.
There was an interview in a recent TBM about A&H archery that might be helpful too.
I didn’t shoot the bow because it is a 65 lb bow which is way out of my universe. So I can’t really say anything about it beyond that.
in reply to: Fred Bears archery man #11436I don’t know what you mean about archery man, but here’s a good site for some history:
in reply to: Flemish Strings #10416If the string looks good, it is good 😀
in reply to: Snake Skins on Bow Question #9284If they are under the finish, then, as you surmised, there is nothing to do. If they are over the finish, then you may want to oil them from time to time. My guess is they are under the finish.
A quick email to black widow would answer this question definitively.
in reply to: The War of Arrows…. Great movie! #9277I’ve had it on our favorites list for a while, but haven’t convinced the kids or wife to watch it. Now I can tell them I heard it was really good.
Thanks for the ammo!
in reply to: Archery Library #55666Very cool. Thanks!
in reply to: Giving It Up #54558You guys don’t know what you are missing.
A good tree stand in the perfect tree is a thing of beauty. To find the perfect tree takes a combination of woodsmanship (ability to read the woods and know where the deer will go), aesthetics (who wants to sit in an ugly place?), craftsmanship (hanging a stand so it is sturdy, yet comfortable and ergonomic for you and the bow) and patience (to know you have done the right thing and will be rewarded).
But variety is the spice of life. So I like to mix things up and stalk around too (I call it stalking, I’m sure the critters call it raising a ruckus). But when it’s time to fill the freezer, hi-ho, hi-ho, its up the tree I go!
in reply to: How times change. #52281ausjim wrote: …Topics still hot for discussion here and now. It’s incredible that a quarter century later it is almost the exact same points of friction in debate… 🙂
When I was a young(er) man, I had the mistaken impression that the human struggle was for truth and love. But as I watch this same scenario repeat itself in all human endeavors, especially politics, I have to wonder about it myself. It seems that a lot of these questions, hopefully bigger questions than broadhead design, only get answered as each generation passes into the forbidden country.
Civilization, and broadhead design, seem to march steadily toward betterment when viewed over the eon’s. But when viewed over a single life, progress is unsteady.
So choose your best broadhead, and your best ideas. But keep your eyes wide open and reconsider each critically for reason and purpose every time you have a new experience or obtain new knowledge. And give your fellow man the benefit of the doubt.
in reply to: weight / foc #52274The thing to do is to increase your point weight. Add the weight needed to get your 650 grain desired arrow weight. Then retune by cutting the shaft till you get good bare shaft flight.
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