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Arrow Jumps during cocking

 
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  #1  
Old 09-18-2011, 08:02 PM
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Join Date: Jan 2011
Posts: 55
Arrow Jumps during cocking

All -

I've been heavily practicing with my Tac-15i the last few weeks getting ready for Archery season and have a really annoying problem.

I connect the traveler to the string and knock an arrow. When I start cranking it back about 1/2 to 2/3's of the way I hear a loud click and the arrow usually jumps off the string and I have to re-knock it. It is still hanging in the whisker-biscuit!

It seems to happen at the same spot everytime cranking it back.

Does this happen to anyone else ? Could it be something withing the cams/bow limbs ?

Once it's cocked and fired it seems to be shooting OK. Though I'm still not getting that great of groups at 60yards (about 9").

I got the xbow for Christmas the end of last year.

Also do most of you paper tune the Tac-15i before shooting ?

WildWillie

Tac-15i
HHA Optimizer
Stock Tac-15 arrows
G5-Montac Broadheads

Last edited by WildWillie; 09-18-2011 at 08:07 PM.
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  #2  
Old 09-19-2011, 12:43 AM
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Join Date: May 2001
Posts: 5,878
Paper tune first.

Read the thread on scope parallax.

Email my son about string jump.

Andy@longrangehunting.com
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  #3  
Old 09-19-2011, 01:41 AM
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Join Date: Dec 2010
Posts: 391
Re: Arrow Jumps during cocking

Hi WildWillie,
I might be able to identify and solve your problem, if it's what I think it might be.

You need to pay very close attention and carefully watch your arrow as it comes back during the cranking operation. I've had and seen this problem numerous times before. The only difference from the way you're describing it, is that it almost always takes place when you are within about 1 1/2 to 2 inches of being seated in the "full cock" position. What was taking place is that as your arrows nock reaches the front edge of your Weaver Rail, the under side of the rail is beveled or angled so that when the nocks touch the rail, they are forced underneath it until they drop into the seated position. As your nocks spread open more from shooting them, the top edge of the nock catches the underside of your rail and is forced forward off your crossbows string as you are cranking the cable back. This obviously dislodges the arrow from its cable position and forces you to let down the cable and attempt another load.

The solution, if this is the problem that is happening on your crossbow is two steps. I would suggest taking a grinding wheel on a dremmel tool and turn your TAC15 upside down on its back. Then grind the edge off the under side of the Weaver rail to remove any edge and possibly create more of an angle to allow a smoother transition.

Secondly, replace the PSE nocks with "Firenock D's, since they are a much stiffer synthetic material and don't have a tendency to spread as easily as the PSE nocks. They are also cheaper by the dozen than the PSE nocks.

Last note, If you have reviewed my article on getting rid of your Whisker Biscuit, you'd know that more and more TAC15 owners have been replacing their Whisker Biscuits with a QAD Drop Away Arrow rest and also cutting 2.75" off their Weaver Rail. This totally eliminates your nocks or vanes from ever having any interference with your scopes rail or anything else on your crossbow.

One of our other very highly respected field testers is in the process of having a brand new QAD Drop Away Bracket machined to his high level specifications and is also having his machinist make the modification to his Weaver rail, so the angle is perfect and he will maintain a perfect finish to his powder coating.

Either way, he now understands the performance advantages derived from performing these modifications. If you are interested, he may be producing several of these arrow rests and might offer them for sale. One of the big benefits is that a shooter is no longer locked into using four fletch arrows, so you can not only use standard three vane arrows, but you can also maintenance your arrows with any standard fletching jig.

Hope this helps,

Jon
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  #4  
Old 09-19-2011, 06:39 AM
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Join Date: Jan 2011
Posts: 55
Re: Arrow Jumps during cocking

Quote:
Secondly, replace the PSE nocks with "Firenock D's, since they are a much stiffer synthetic material and don't have a tendency to spread as easily as the PSE nocks. They are also cheaper by the dozen than the PSE nocks.
Jon -

I already use the Firenock "D"'s, and it happens with them as well the stock nocks.

Also it is happening before the carrier assembly with arrow gets to the scope rail. It happens at the same point each time which is about 2" forward of the scope rail. (As the carrier passes over the back end of the long hand groove under the rail)

When I am cranking it back there is a noticable "Click" coming from the front end of the bow. Sometimes if a am cranking very slowly it does not occur, but 90% of the time it does.

It seems as if something is binding in the limbs or cams and when it gets to a certain point it free's itself causing a snap in the string.


Willie
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  #5  
Old 09-19-2011, 07:51 AM
Junior Member
 
Join Date: Aug 2011
Posts: 7
Re: Arrow Jumps during cocking

I hope someone has the answer to this as mine started to make this same sound. I have only fired my bow about 50 times.
I get that loud snapping sound from the front right side of my bow. It occurs no matter how slow I crank it back. The only difference is my arrow will stay on my string.
I am afraid that something is about to fail in a big way.

Also I noticed that the string stops are spit 1/2" deep from the string impacting them. I guess a call is in order to PSE today.
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  #6  
Old 09-19-2011, 03:33 PM
Junior Member
 
Join Date: Sep 2011
Location: indiana
Posts: 19
Re: Arrow Jumps during cocking

Lmao!!!!!!! Do not and i repeat do not grind anything on your xbow. It is a easy fix i had the same problem it is when you pull your string out past your d loop. It is like a fishing reel it all winds up then slides off the spool and thats where you get your jump pull the string all the way out and reel back in and make your string go to one side or the other and it will fix your problem i hade a heack of a time with it untill i talked to the pse engineer thanks trav
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  #7  
Old 09-19-2011, 06:49 PM
Bronze Member
 
Join Date: Jan 2011
Posts: 55
Re: Arrow Jumps during cocking

I do not plan on grinding anything on my xbow.

After removing the upper and inspecting everything, I tried cranking the string with some tension on it. As infantrysold mentioned, the problem is when the string starts spooling it piles up on itself. At some point the string finally slips to the side and that is where you get your "jump" from. If you've ever fished offshore with some of the big reels you have to help guide the string as it is being wound on or else it piles up on one part of the reel. Same thing with the xbow. The string is piling up, but under the tension at some point it slips off the pile and that is where it jumps.

After putting everything back together I was able to test by guiding the string as I cocked the xbow and the problem went away. If I do not guide it the problem returns.

After shooting at paper, I noticed I was getting a tear to the bottom. Adjusted the rest and have taken most of the tear out.

WildWillie
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