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TAC 15/15i Basic Unpublished Information
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<blockquote data-quote="Konrad" data-source="post: 487382" data-attributes="member: 26549"><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">There are a number of issues that can contribute to "large" groups as compared with shooting a single projectile.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">1: Not all shaft cutting equipment does a good job (or even a fair job) of making a square cut. Poorly cut shafts on either end results in forces not applied equally across the nock end of the shaft surface.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">There are two good devices for addressing the task.</span></span></p><p> </p><p><a href="http://www.lancasterarchery.com/advanced_search_result.php?keywords=squaring+tool&osCsid=vr4po5mhjvagagebhnkuja8hi1" target="_blank"><span style="font-family: 'Times New Roman'"><span style="font-size: 12px"><span style="color: #800080">http://www.lancasterarchery.com/advanced_search_result.php?keywords=squaring+tool&osCsid=vr4po5mhjvagagebhnkuja8hi1</span></span></span></a></p><p> </p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">A point end cut will not allow the insert to properly seat against its rear flange. In addition, removal of material from one side of the wall and not the other introduces rotational mass instabilities that can degrade accuracy potential.</span></span></p><p> </p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">2: Improper installation of inserts (specifically, poor/uneven distribution of the adhesive) also introduces rotational imbalances related to item #1. Sadly, most shops use an epoxy compound when gluing inserts into shafts and the heat required for removal damages the epoxy binders used in most carbon composite constructed shafts. I would be tempted to cut the entire insert off and start from scratch.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">An advantage to this is if you use a slow setting compound (highly suggested); you can orient all of your broadheads in the same fashion before the glue takes a set. Should you decide to do this, do not try to remove the broadhead until the complete cure time is elapsed. Many folks will start with a bare shaft, install the insert, install the broadhead and then spin the shaft point down on a hard surface and observe for a wobble. If there is perceived wobble, rotate the insert 90 degrees and spin again. When you find a minimum wobble, stop.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Then apply fletching.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">3: PSE states their shafts have a standard deviational run out of plus or minus .003 inches. Read that .006 total indicated run out (TIR). No professional FITA archer would enter any contest with new shaft inconsistencies of this magnitude. FITA or Olympic competitions range out to 98 yards.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Bow hunters often believe .003 inches is pretty good; however, most modern bowhunters rarely shoot at game beyond 50 yards…and that is considered extreme distance by most.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">4: Large shaft to shaft completed arrow weight deviations will not make you happy either.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">The basic problem may be an ammunition one at its root.</span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I hope this helps,</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Konrad</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">PS</span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Questions:</span></span></p><p> <span style="font-family: 'Times New Roman'"><span style="font-size: 12px"></span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">What is the clearance between the fletching and buss cables?</span></span></p><p> <span style="font-family: 'Times New Roman'"><span style="font-size: 12px"></span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Is there actually enough room to experiment with rotating the nock without hitting the cables?</span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px"></span></span></p></blockquote><p></p>
[QUOTE="Konrad, post: 487382, member: 26549"] [FONT=Times New Roman][SIZE=3]There are a number of issues that can contribute to “large” groups as compared with shooting a single projectile.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]1: Not all shaft cutting equipment does a good job (or even a fair job) of making a square cut. Poorly cut shafts on either end results in forces not applied equally across the nock end of the shaft surface.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]There are two good devices for addressing the task.[/SIZE][/FONT] [URL="http://www.lancasterarchery.com/advanced_search_result.php?keywords=squaring+tool&osCsid=vr4po5mhjvagagebhnkuja8hi1"][FONT=Times New Roman][SIZE=3][COLOR=#800080]http://www.lancasterarchery.com/advanced_search_result.php?keywords=squaring+tool&osCsid=vr4po5mhjvagagebhnkuja8hi1[/COLOR][/SIZE][/FONT][/URL] [FONT=Times New Roman][SIZE=3]A point end cut will not allow the insert to properly seat against its rear flange. In addition, removal of material from one side of the wall and not the other introduces rotational mass instabilities that can degrade accuracy potential.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]2: Improper installation of inserts (specifically, poor/uneven distribution of the adhesive) also introduces rotational imbalances related to item #1. Sadly, most shops use an epoxy compound when gluing inserts into shafts and the heat required for removal damages the epoxy binders used in most carbon composite constructed shafts. I would be tempted to cut the entire insert off and start from scratch.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]An advantage to this is if you use a slow setting compound (highly suggested); you can orient all of your broadheads in the same fashion before the glue takes a set. Should you decide to do this, do not try to remove the broadhead until the complete cure time is elapsed. Many folks will start with a bare shaft, install the insert, install the broadhead and then spin the shaft point down on a hard surface and observe for a wobble. If there is perceived wobble, rotate the insert 90 degrees and spin again. When you find a minimum wobble, stop.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]Then apply fletching.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]3: PSE states their shafts have a standard deviational run out of plus or minus .003 inches. Read that .006 total indicated run out (TIR). No professional FITA archer would enter any contest with new shaft inconsistencies of this magnitude. FITA or Olympic competitions range out to 98 yards.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]Bow hunters often believe .003 inches is pretty good; however, most modern bowhunters rarely shoot at game beyond 50 yards…and that is considered extreme distance by most.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]4: Large shaft to shaft completed arrow weight deviations will not make you happy either.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]The basic problem may be an ammunition one at its root.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]I hope this helps,[/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]Konrad[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3][/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]PS Questions: What is the clearance between the fletching and buss cables? Is there actually enough room to experiment with rotating the nock without hitting the cables? [/SIZE][/FONT] [/QUOTE]
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