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TAC 15/15i Basic Unpublished Information
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<blockquote data-quote="jon.henry755" data-source="post: 487895" data-attributes="member: 29115"><p>Hi Konrad and Super 91,</p><p>Thanks for keeping the thread going until I had time to add my two cents, as usual. </p><p></p><p>Konrad,</p><p>The gentleman from Bohning was just slightly off his details. The Bitzenburger nock receiver used by PSE (Carbon Force) is the product #3012. I've spoken directly with the owner of Bitzenburger and with the PSE Customer Support Engineers to validate this. The #3012 is a 4 fletch receiver that spaces at 60 x 120 and PSE has their jigs set with no offset, so it's a perfectly straight fletch. </p><p></p><p>I have two Bitzenburger Jigs set up with these 4 fletch receivers, so I can reproduce identical fletching to that of the factory. It requires moving the Bitzenburger single BB in the receiver to the rear most position and then putting the set screw back in place. </p><p></p><p>Like you and Bob, I'm not a fan of the PSE Nock and also agree that between these shafts and their nocks they are holding all the cards and taking huge advantage of it while it lasts. This may be why they have been very tight on releasing many details about the entire TAC15 product line. </p><p></p><p>I would love to see somebody come out with a nock and a uni-bushing as used on XX78's, Easton ACC's or Easton ACE's to prevent nock alignment problems and support easy rotation and tuning of nocks. </p><p></p><p>Super 91 and I are both aware that the special nocks that PSE uses on their TAC arrows leave a great deal to be desired. Alignment is one key concern and the other is the nock seems to lose its memory after enough shots. By this I mean that it initially holds onto the string fairly well, but it loses its shape for a snug fit after a couple dozen shots and then has an undesirable loose fit. As we all know, this should never happen, but especially not on nocks that are selling for $25 per dozen. </p><p></p><p>As Super 91 stated, he's recently begun static spine testing the TAC shafts with his RAM Carbon Spine Tester. Although the readings are all over the place with multiple stiff points, that's not unusual for certain types of carbon shafts. One spot around the circumference of the shaft should test slightly lower than any of the other readings, even if it's only lower by .002. For that arrow, this spot will be the stiff part of the spine and needs to be marked for both indexing the nock and alignment of the vanes. </p><p></p><p>We know the manufacture is not pre-sorting their shafts by spine deflection, they are not spine testing the arrows and they are not indexing their nocks to anything other than their spray on TAC labeling. The spray on labeling is what they've been using to align their nocks and vanes to on the shaft.</p><p></p><p>All this said, it would clearly be easier to build our own shafts from scratch, but until very recently PSE was not selling raw shafts for these XBOWs and as you've already stated most people don't have access to a carbon arrow spine tester.</p><p></p><p>If Bohning, Bjorn or Beiter comes out with a nock that will handle the force of the TAC15i, I would be very interested. I'm fairly confident that any good nock that is enlarged to fit the thickness of the PSE TAC Cable will depress the anti-dryfire lever to allow it to work properly. That's theory, not fact because I haven't tested it out to verify it, since only Firenock has come out with a replacement product. </p><p></p><p>If a manufacture is going to mass produce nocks, the shaping of the injection mold for the plastic is easy to shape to accommodate extra length if needed.</p><p></p><p>Regards,</p><p></p><p></p><p>Jon</p></blockquote><p></p>
[QUOTE="jon.henry755, post: 487895, member: 29115"] Hi Konrad and Super 91, Thanks for keeping the thread going until I had time to add my two cents, as usual. Konrad, The gentleman from Bohning was just slightly off his details. The Bitzenburger nock receiver used by PSE (Carbon Force) is the product #3012. I've spoken directly with the owner of Bitzenburger and with the PSE Customer Support Engineers to validate this. The #3012 is a 4 fletch receiver that spaces at 60 x 120 and PSE has their jigs set with no offset, so it's a perfectly straight fletch. I have two Bitzenburger Jigs set up with these 4 fletch receivers, so I can reproduce identical fletching to that of the factory. It requires moving the Bitzenburger single BB in the receiver to the rear most position and then putting the set screw back in place. Like you and Bob, I'm not a fan of the PSE Nock and also agree that between these shafts and their nocks they are holding all the cards and taking huge advantage of it while it lasts. This may be why they have been very tight on releasing many details about the entire TAC15 product line. I would love to see somebody come out with a nock and a uni-bushing as used on XX78's, Easton ACC's or Easton ACE's to prevent nock alignment problems and support easy rotation and tuning of nocks. Super 91 and I are both aware that the special nocks that PSE uses on their TAC arrows leave a great deal to be desired. Alignment is one key concern and the other is the nock seems to lose its memory after enough shots. By this I mean that it initially holds onto the string fairly well, but it loses its shape for a snug fit after a couple dozen shots and then has an undesirable loose fit. As we all know, this should never happen, but especially not on nocks that are selling for $25 per dozen. As Super 91 stated, he's recently begun static spine testing the TAC shafts with his RAM Carbon Spine Tester. Although the readings are all over the place with multiple stiff points, that's not unusual for certain types of carbon shafts. One spot around the circumference of the shaft should test slightly lower than any of the other readings, even if it's only lower by .002. For that arrow, this spot will be the stiff part of the spine and needs to be marked for both indexing the nock and alignment of the vanes. We know the manufacture is not pre-sorting their shafts by spine deflection, they are not spine testing the arrows and they are not indexing their nocks to anything other than their spray on TAC labeling. The spray on labeling is what they've been using to align their nocks and vanes to on the shaft. All this said, it would clearly be easier to build our own shafts from scratch, but until very recently PSE was not selling raw shafts for these XBOWs and as you've already stated most people don't have access to a carbon arrow spine tester. If Bohning, Bjorn or Beiter comes out with a nock that will handle the force of the TAC15i, I would be very interested. I'm fairly confident that any good nock that is enlarged to fit the thickness of the PSE TAC Cable will depress the anti-dryfire lever to allow it to work properly. That's theory, not fact because I haven't tested it out to verify it, since only Firenock has come out with a replacement product. If a manufacture is going to mass produce nocks, the shaping of the injection mold for the plastic is easy to shape to accommodate extra length if needed. Regards, Jon [/QUOTE]
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