Main Discussion Area > Arrows
Shaft spiner?
Evil Dog:
Spent the last hour or two verifying the spine weight of about a hundred cedar shafts.... they were from probably 3 different suppliers, some directly from Rose City itself. They were all represented to be 45# (actually 43# to 48#). It was absolutely amazing to me the variation I encountered.... some as low as 40# and some as high as 57#. I went through the entire pile three times and all of the readings repeated themselves. I've no particular reason to doubt the accuracy of this home-built spine tester as all of the readings made were consistent rather than the same shaft giving 3 different readings. Had a dozen come out at exactly 52 pounds and all weighing within a 5 grain spread. Think I will set those aside for my next set of personal arrows.... have a couple of color combinations that I have been wanting to try anyway.
Justin Snyder:
I built the Jim Hill model and started testing shafts that I had ordered. They had the weight on them 42, 44, 43 not just a 45 group. My tester measured 2 pounds under on all. Then I tested one that said 57 and it was 75. OOPS somebody is dyslexic. Justin
Primitive1:
Like bows, wood arrows gain and lose weight through water absorption or loss. I would think it a difficult task to sell arrow shafts at a particular spine grouping since their arrival in Arizona would read differently from the same spined group arriving in Louisiana after acclimating over a period of time. I also wonder how wet they are (or dry for that matter) when they are measured for spine and are shipped. Come to think of it, the variables to be considered alone with a spined group of wood shafts would scare me away from making any claim; too much to consider! :-X. Porosity/density, grain straightness, length...hats off to those who stabalize enough to even get close! It would be interesting to take a cedar shaft at 45# and put in a 110 degree hot box for a week and measure spine and then put it outside (assuming high humidity) for a week and measure the difference between the two. I would guess that difference would be quite remarkable.
Primitive1:
I'm finishing up a bow from that 'recently felled Ash tree' to go with the arrows from same...it's amazing to me how completely different the spines are from the arrows made from the same log of Ash...it is remarkable...there are some that are bendy as wet noodles and others which are quite stiff (shafts split out, not sawn and dried similarly). I was also wondering, on the ones that are really bendy, if 'heat treating' them would stiffen them up enough if they are close to a particular spine weight (like a bow belly is heat treated). Not sure, but once I finish up the bow I'll get some pics out and start on my spine tester...the neat thing is this bow is squirrely in the alignment department (in a good way) so that it's center shot...you can notice a difference in shooting the 'bendy' arrows however, although they hit in the same spot, but you can watch them 'wiggle' as they go down range; its weird to observe.
onemississipp:
anyone got a pic of the finished spine tester "skeaterbait" linked to?
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