KLINT I like your insert/adaptor /internal footing. I tried to have one made similar to it in grade 5 titanium. The .240 (for 5/16 arrow) insert was 3 in long and the 5 degree taper was AMO standard .The prototype weighed in at 200 grans .It was beautiful….the cost of production for no less than 100 pieces was$18.00 . FOB the machine shop Needless to say it was not feasible for me. Hope you can get them built as there is a need for all sorts of good adaptors. It is a good concept.
The adaptor being a weak spot in any arow set up requires special attention of the archer especially for game animals deer size and up.
I have been working on many different variations of adaptor and running stress test on all for several years.
Richie Nell gave me a idea about a year ago that I took up and worked on . When I finally settled on a design and had working drawings made I found that the cost just for the set up for each weight adaptor or style I wanted to make on a screw machine was way beyond my budget and the minimum runs were to high
Some things deserve to be, made like your adaptor, regardless of sensible marketing. I had my heart set on making these adaptors so I approached Larry Hanify of Abowyer broadheads ( you don't know how that hurts to type those words
sorry Larry
)
He also was working on similar ideas independently from me so we teamed up sharing ideas and cost. Sharing cost and production runs makes a lot sense making every thing more feasible.
The steel we decided on was 416 stainless, …... 12L14 carbon steel mentioned above and the 416 ss we chose are almost equal in tensile strength and yield strength.
The 416 stainless being superior in corrosion resistance.
The 12L 14 does machine well because lead is added to the alloy to make it they way . The 416 may be harder to machine and harder on tools but the other properties out way that. ALL OUR 416 SS ADAPTORS WILL BE HEAT TREATED FOR FURTHER TUFFNESS.
SPECILITY ADAPTORS We are going to offer a insert /adaptor for the 5/16 arrow() to begin with ) that has a 1/4 t0 3/8 long post (shank)s between the insert and the 5 degree taper .The shank concept has multiple benefits:
1 Once the insert is in the carbon arrow and the broad head is mounted , an aluminum footing can be slid down the arrow and over the shank covering any gap that would have been between a normal insert and adaptor. (not easy to explain) but making for a extraordinary solid set up.
2 The shank puts the broad head weight further out on the arrow helping to facilitate FOC.
3 The shank allow a insert /adaptor to be made in heavy weights with out extending the length of the adaptor which could effect arrow spine.
4 Can be use by it self or with footings mentioned above
WE are going to offer these in weights of 150, 175 , 200, 225, and 250 grains
Later we hope to do one for the 9/32 arrow with a ID. of .203 i
We are also going to offer screw- in adaptors that can be used on any diameter arrow as long as they have a 8-32 thread insert. These screw in adaptors can be used by them selves or with a aluminum footing arrangement on both 5/6 OD .and 9/32 OD.arrows
These screw in adapters wil be offered in heat treated416 ss in 150,175,200 grains
STANDARD ADAPTORS We are a now in production with standard 75,100,125 grain 416 ss heat treated adaptors which hopefully will be available soon at
www.abowyer.com or
www.tuffhead.com KLINT I did not mean to steal the thread but wanted to discuss the metal options mentioned in the post. There is a need for good in-serts and out-serts. The more one can choose from the more they are able to match a adaptor to their individual needs. Thanks for your idea
Topic: making custom adapters. what grade steel? (Read 444 times)
