well
this is absolutley facinating
I've been struggling to fletch some 1000 triples with an upright Arten jig. Now those as most of you will know are pretty skinny arrows. so of course the difference in space between the fletchings shows up really clearly with two small gaps and a big one. I thought it had something to do with my using beiter nocks even with an adaptor as I had some memory of a similar problem years ago where I resorted to using g nocks in the jig and got a better results.
I've got over my current "problem" by marking the arrows with a tri-liner and then turning them in the nock to line up the line with the clamp for each fletch rather tham moving the jig round the arrow
and using fletchings with a narrow footing.
You wouldn't think I've been at this game for ^^teen years
I've never read anything about uneven spacings, but come to think of it it would help clearance over a launcher of past a riser - so it makes sense. I'm not surethat the un-equal spacing makes much difference to arrow flight, but then I've been using spin wings out of a recurve for most of my archery life and have used one of these tube like things with the slots in it for positioning those.
Anyway the triples I've fletched so far aren't that prefectly spaced and they're grouping alright.
RIK - the jigs may well be machined by a bloke in a shed in Scotland, but they have been engineering stuff for years - I'd think they know a thing or two; and I do buy joetapley's answer. I've visited Arten a couple of times and they're among the nicest people you could hope to meet. If I get an opportunity I'll ask Mr Arten
In the meantime, I'll be digging through my basic archery books and seeing if I come up with anything and I'll measure my jig and I'll ask some "oldtimers" who may know a thing or two.