You will very easily find out how. The 3 main point are below:As a personnel response to the information you've supplied, I only have one point that I'm not sure I agree with. While I understand that the Bitzenburger Fletching Vise may not be dead on accurate in its ability to index (rotate arrow shafts) at precisely 60 degree spacing or 120 degree spacing, it does rotate the exact amount of spacing each time on the same jig. That spacing might be 55 degrees or 125 degrees when going from one side of the shaft to the other, but it is the exact same spacing each time a user rotates the nock indexing knob.
That would indicate that each arrow produced on these jigs would have exactly the same spacing between each vane placed on each shaft with this jig. In order to achieve the same performance from arrow to arrow, its necessary to maintain the same exact alignment of the vanes, but it does not need to be exactly 60 degrees or exactly 120 degrees spacing. The 120 degree spacing is used to support maximum vane clearance from the cables and the 60 degrees is a spacing between each set of vanes on the two sides of the shaft, so I fail to understand why a deviation of 4 or 5 degrees would matter as long as every arrow produced had exactly the same 4 or 5 degree deviation?
1) If pass experience is any indication, the chuck indexes are always off by 2 or more degrees each. With the 6 bitz I have which should all be 120 degree, it is actually ,120, 118, and 122 on all 6. It is not an IF, but what is out there.
2) it uses a nock receiver, which if you put the nock in, the nock has play and unless the nock receiver hold the nock perfectly and there is absolutely no movement at all. there is play, thus angles of absolute fletching can be off, not to mention as the angle of the shaft is always not going to be perfectly straight, the shaft is always going to be pointing down which as the nock rocks, the angle of the fletch on the vane will NEVER be even.
3) The play between the index chuck and the bitz main body itself. a 1 mm space gap will equivalent to about 5 degree base on the size of the arrow, assuming it is 0.204"
With the Aerovane Jig I designed, that is exactly what I have addressed.
1) The chuck is made of 6061T6 with Titanium Nitrate coating on a CNC machine with a zirconium nitrate ABEC#5 ball so the index is +/-0.005 mm or 1/72 of a degree
2) I use a 303 stainless 0.05 roughness slide chuck so by eliminate the nock, the inside of the arrow shaft should be the most accurate one can deal with. Not to mention by using a ball hearing hook holder base on specific shaft size, the leveling of the shaft will be just about PERFECT.
3) By using 2 ABEC#5 ball bearing with Thermo fitting process, the index will be +/- 0.0002" of play on all 3 axis.
That about sum up of why and how I take care of the fletching on jig accuracy issue.
Dorge