Are my shafts really too weak??

[BigBiker]

Hi just been trying to tune my bow. On bare shaft test, bs going to right. So, I should increase tension spring of button. Or have I got the wrong arrows??

They are xx75 platinum plus 2016. My bow is on it's lowest setting, 36lb. My draw length was 30" when I bought the bow 2 months ago. The arrows are 31" from nock to shaft end.

When the easton site asks for arrow length does it mean draw length?

Just concerned that the shafts won't be up to the 40lbs if I decide to go up.

Is there a way to eliminate the button as it were to decide if it is the shaft or the button at fault?


Thanks

[niceguy]

Your shafts are about right according to my charts. Try stiffening the button a turn or so. Slightly week arrows won't do any harm, better than too stif IMO. Also depends on the pile weight. Shaft length is measured from the groove in the nock to the end of the tube, not the pile.

[BigBiker]

Thanks Niceguy.

Doing this at 30 feet.

My Cartel button's tension screw is all the way in and the bare shaft is always to the right of the group. Part of the group but never to the left of it and never really in the centre as such.

The bs always leans to the left.

I've had to wind my sight right out, about 1/4 of an inch thread to spare and still about 3" from centre of target.

MMMmmm interesting!

Maybe I should be checking clearance??


Thanks


Kevin

[AlanT]

You mention that your bow is at its lowest setting of 36lb. I assume you mean the riser has been 'wound out'. If so, and assuming a 10% variation between 'wound in' and 'wound out' (I know this varies between manufacturers), a set of 36lb limbs might weigh 34lb at 28" 'wound out', which would be something like 38lb at your 30" draw length.

Have you had the bow measured at your draw length? To answer your question properly, you do need to know this.

However, assuming your bow weight of 36lb is measured at your draw length (i.e. the 36lb is measured at 30"??), the Eaton table puts you in the T8 spine group. This suggests XX75's of size 2213 or 2114.

Arrow legth on the Easton tables = nock groove to end of shaft (not including the pile).

The 2016 XX75 only appears in the T7 group, which at 31" is better suited to a bow of 30-35lbs. It looks like the answer to you question is yes, the shafts are a little on the weak side.

Also, I would add that button tension cannot be used to make a weak arrow 'right'. That can only be done by changing the bow weight.

Alan

[BigBiker]

Hi alan. The bow has been measured. The 36 i mention is on the fingers, wound out and a 30" draw length. Being as I can wind it in to 40 on the fingers, I believe it is possible the arrows have been mis-sold.

This combined with the fact that the button will not take the bareshaft to left of the group.

Should i be contacting the shop??


Thanks.

[Rhys]

You've got a 30" draw and 31" arrows?
Cut them down an inch and they might be closer, but there's no chance in hell 2016s willl spine at 40lbs at 31"

[AlanT]

I'm guessing your limbs are marked as 34lb (not totally relevant, but fits what you are saying)?

The arrows you have would be about right for somebody drawing your bow to 28".

Just to be sure, how was your draw length measured ?

The AMO standard measures length to throat of the grip + 1.75", so for your 30" we are talking about 28.25 to the throat of the grip.

In most cases, the button is located above the throat, so allowing for 1.5" of arrow in front of the button, you could have the arrows trimmed to 29.75" which would stiffen them and move them into the T7 group, ok for bows in the range 36 - 40lb.

For info, I shoot 28.5" arrows at 29" draw

Alan

[BigBiker]

Thanks again Alan and Rhys.

So I'm drawing 30" to the button. From what you've said, that will be 31.5" draw length. A clicker wont work if the arrows are any shorter.

The chap in the shop left them longer for "growing room". On that basis, they are too weak for the length they have been cut to.

I think I may be right in saying these are the wrong arrows for me??


Thanks

[AlanT]

Originally Posted by BigBiker

Thanks again Alan and Rhys.

So I'm drawing 30" to the button. From what you've said, that will be 31.5" draw length. A clicker wont work if the arrows are any shorter.

The chap in the shop left them longer for "growing room". On that basis, they are too weak for the length they have been cut to.

I think I may be right in saying these are the wrong arrows for me??

If you are drawing 30" to the button, your 'draw length' will be 31.75".

The arrows, at 31", will have 1" + pile in front of the button. This is the minimum you should have. If your draw length is the same as when you bought the arrows, you haven't been left much 'growing room'.

They would appear to be too weak.

Alan

[BigBiker]

IIRC my total draw length was 30", in the shop. So, I've already grown. TBH i have to go some to make the 30" to the button, ie push with bow hand, ensuring shoulder is kept down while at the same time making sure the drawing elbow comes all the way back. I have the string on the front of my nose.

I will contact the shop for a polite discussion over this.

Thanks a lot