Third Axis



1. Third Axis

Can someone please explain third axis tuning?

2.

3. If you do a search on 3rd axis, Nuts and Bolts has done a great job of explaining it several times.

4.

Originally Posted by LiteSpeed1
Can someone please explain third axis tuning?
LiteSpeed1:

2ND AXIS

2nd axis on your sight is basically making sure the bubble level

This presumes that your string is vertical when the bow is also vertical.
You essentially figure a way to hold your bow vertical (use a bow vise),
and then check to see that your bubble level in the sight is also reading vertical.

If not, then adjust the bubble level with the 2nd axis adjustment,
to make the bubble level on your sight read level, when the bow and bowstring are vertical.

3RD AXIS

Ok, so now we understand what 2nd axis is on your sight.

So, what is 3rd axis?

Well, what if the entire sight ring was mounted on a door hinge?

Yup. What if the entire sight ring could swing like a door?
You could swing the door towards you or away from you.

Well, let's say we swing the door towards you 45 degrees.
The bubble level still reads level, i.e., the threaded rod is still horizontal.

You know what will happen on a steep uphill shot?
Even if you aim uphill, and your bow is not tilted left or right,
the bubble level will lie to you and force you to tilt your bow.

Try this with a 24-inch level. Hold the level in your hand so that it is still horizontal, but the angle between the level and your arm is 45 degrees, as if you swung a door towards you. Raise your arm towards the ceiling.
The bubble level will not stay in the middle.

Adjust the third axis on your sight is the same as adjust the door swing so that it is 90 degrees.

3rd axis will affect uphill shots (NFAA field rounds) or downhill shots (from a treestand).

Imagine that your sight ring is a door. If you bump your sight ring into a tree, the sight ring may bend towards you like swinging a door closer to your face. Let's say the sight ring "door" opened towards you 45-degrees. The bubble still reads level when you hold the riser straight up and down.

Now, hang a weighted string from the ceiling.
Kneel down on your knees, load an arrow in a safe spot, come to full draw and anchor.
Line up the weighted string with the left edge of the riser and your limbs.

Take a look at the bubble.
The riser and limbs are vertical because you are lined up with the weighted string.
If the sight ring threaded rod is bent towards you or away from you,
the bubble will not read level even though you are not canting the bow.

Adjusting the 3rd axis of a bow restores the sight ring door swing
back to 90 degrees, perpendicular to the sight frame.
The best way to check is kneeling down on your knees,
aiming up at a weighted string hanging from the ceiling.

If you sight does not have 3rd axis adjustment,
you will need to use shims to adjust the entire sight or just the sight ring.
Last edited by nuts&bolts; May 28th, 2006 at 03:14 AM.

6.

7. Thanks nuts&bolts.

8. Nicely done

Very good explanation

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this is why archery talk is great

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third axis

check this site out too,http://www.archerytech.com/

11. another way is to get a level door frame, (target sight only method) place your sight bar level with the door frame, adjust 2nd axis there, point your scope at the ceiling and check it agian

12. Originally Posted by nuts&bolts
LiteSpeed1:

Now, hang a weighted string from the ceiling.
Kneel down on your knees, load an arrow in a safe spot, come to full draw and anchor.
Line up the weighted string with the left edge of the riser and your limbs.

Take a look at the bubble.
The riser and limbs are vertical because you are lined up with the weighted string.
If the sight ring threaded rod is bent towards you or away from you,
the bubble will not read level even though you are not canting the bow.
when lining up the weighted string with the edge of the bow, are you aiming up, or just horizontally??

thanx!!

13. Aiming high

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Check out HTM for 3rd axis adjustment

WWW.HTMbowsights.com

I shot terrible at my first IBO this weekend at Bedford , IN
I was right on with all my yardage estimates but was shooting left on uphill and right on down hill shoot.
I never had shot at these steep of angles.

I heard that a company would check you 3rd axis alignment at the vendor building. I went and found this company called HTM.

They were selling a machine that every serious archery shop should have.
the HTM precision 3rd axis bow vise. They were able to adjust my bow on site and show me that I came to the IBO unprepared.

I might have to buy this for my home.

15. Originally Posted by Tmaziarz
WWW.HTMbowsights.com

I shot terrible at my first IBO this weekend at Bedford , IN
I was right on with all my yardage estimates but was shooting left on uphill and right on down hill shoot.
I never had shot at these steep of angles.

I heard that a company would check you 3rd axis alignment at the vendor building. I went and found this company called HTM.

They were selling a machine that every serious archery shop should have.
the HTM precision 3rd axis bow vise. They were able to adjust my bow on site and show me that I came to the IBO unprepared.

I might have to buy this for my home.

That is one of the best third axis tools I have seen.....

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level wall?

Couldnt you just hold your bow against a straight and level wall and tilt it forward and backwards with the limbs flush against the wall to check for 3rd axis?

17. 3rd

I have a 3rd axis sight on my bow but still do not understand when i need to mess with it..

18. It's there to compensate for vertical tilt like when you're angling down in a tree stand or angling up when shooting a long distance shot.

When the bow is dead vertical (checked usually in a bow vise with a second level) you tilt the bow forward or back and check to see if your sight level is still centered. If not, that's when you use the 3rd axis adjust.
Last edited by Dave V; November 29th, 2008 at 04:39 AM.

19. thanks for the explanation everyone i wasnt sure what third axis was before i read all the chatter and i get it now i am am also going to rethink my opinion about going out and getting a third axis sight boy the wife is gonna love this one

20. all it does is if your shoting uphin or downhill it adjust so you hit your animal at the same spot as you would if you were on flat ground

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anyone have an explanation of how to adjust for this?

If aiming up hill and the bubble is right- do this....?

If aiming down hill and the bubble is left- do this...?

22. Originally Posted by b_vanfossen
anyone have an explanation of how to adjust for this?

If aiming up hill and the bubble is right- do this....?

If aiming down hill and the bubble is left- do this...?
This is pretty simple, this is for a right handed bow so the opposite is true for left.

If the bubble is to the right while aiming up hill the housing needs to be turned clockwise about the axis (away from the riser)

Just the opposite is true for a downhill shot if aiming down hill and the bubble is to the right you need to move the housing counterclockwise (towards the riser)

Hope this helps.

Aloha

23. 3rd axis

For those who have read N & B but still dont understand let me describe it as I understand it.
First u need sto set your bow vertical, I do this by cutting a piece of aluminium angle or even a piece of wood drilling a hole in one end and bolting it to the stabaliser hole and then locking the other end of the angle or wood into a vice. (I use this system for tying nocks, setting peeps etc) using a small bubble level (say 6")set the bow vertical by putting the level on the sight window and rotating the bow until set.
Place the level vertical on the vertical bar of the sight and without moving teh bow set the bar vertical by undoing the 2 screws and rotating the bar. You have now set the 1st axis.
Look at the scope bubble, if that is displaced left or right then undo the locking screws and adjust the scope up or down until the bubble is level. You have now set the 2nd axis.
Now remove the bow from the vice and set the bow against a vertical surface say a door or wall with the bottom cam and stabaliser on the floor Use your 6" level to set the bow vertical on the string or sight window. The bow will be angled forward onto the stabaliser . Check where the scope bubble is , if it is left or right loosen teh 3rd axis screws and move the scope forward or back until bubble is in the middle. Now set your bow vertical i.e. the stabaliser straight up once again check bow is vertical. Check out he scope bubble, in this case if you did the previous adjustment correctly teh bubble should remain in the middle -if not adjust and recheck the previous setting.
You have now set the 3rd axis
To explain the third axis try a simple test. Hold the bow in front of you as if you were shooting it. Hold it with the bow hand alone lets adjust the bow so that he scope bubble is in teh middle. Now twist your wrist say toward the right, still keeping the bubble in teh middle. Now keeping your wrist twisted raise you arm upward. In this case (assume right handed) then bubble will move to the left. If you were shooting uphill and your scope was twisted toward you then thi what will happen and you would rotate you bow to get the bubble back in the middle which would be wrong and the arrow ould land to the left of the target??

24. Heres a real simply way to set both the 2nd and 3rd axis. Get youself a quality metal faced carpenters level, simply secure the level ("LEVEL") vertically in a vise. Take you're sight bracket and hold it against the side of the level, now adjust the 2nd axis so it is also level (the bubble in you're sight), this will be done by rotating the sight housing clockwise or counter clockwise. Now holding the sight mounting bracket against the level, piviot the front of the sight upward and downward, you will now adjust the 3rd axis, the sight housing will need to either need to be moved inward or outward to make sure the sight bubble stays level as you piviot the front of the sight up and down. Hope this simple version may be of some help. Good Luck!

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anyone know a good set of bubbles/tools one can buy to adjust 3rd axis?

26. I need a video of setting 3rd axis. Anyone?

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Kadob62 explained this pretty much the easiest way to understand, at least in my mind.

28. I understand what was said. Yet I have a question...

What effect, if any, does this adjustment have on shooting horizontally ? Does one have to compensate for the 3rd axis adjustment in ANY way ??

Stay Safe,
Franz

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