Limb alignment ............

[Cimbian]

Originally Posted by darthter

On the Simon Needham DVD, he also uses a piece of card at the far end of the long rod with horizontal gradations so that when using the long rod in combination with an arrow (see above), you can take note of any deviation from true and align the rest from that mark.

An excellent idea which I couldn't be bothered to do.....the alignment on my riser/long rod was close enough for the level that I was tuning too.

... and there's the nub.

Unless calibrated the technique is flawed.

[Cimbian]

Originally Posted by sp220

You forget, even if the bushing is completely straight - how do you know the longrod itself is...?

No I didn't, and, agreed, you don't... it is just another one of those manufacturing tolerances; though it is probably not tested in most cases... just a quick look by QA on the way out of the door.

[Thunk]

Originally Posted by sp220

The only systems I've seen with a fine enough adjustment for almost absolutely spot on are perhaps the new Win and Win alignment system and maybe the ofset disk adjustment system on the samick bows.

Ahem...if you have a bow with separate limbs pockets like mine (Merlin Quazar) or some of Keith Gascoigne's risers, then you do have a system capable of very fine adjustment indeed.

My limb pockets sit on a pivot bolt, and adjustment is effected by a grub screw in each side of the riser. A quarter turn off one side - a quarter turn on the other...no problem!

[Chris B]

Originally Posted by sp220

In fact there are basically no "increments" at all, being as when loose, the whole pocket can be positioned freely.

So yes - there is an example of a system that can be used to get a perfect centre line (trust Keith to pull that off). But tricky...

This is the way the Samick Ultra works. The Samick Masters riser works in an identical way to your Inno. ie. The adjustment is technically infinitely fine. It is just not a question of increments; if you want to turn the grub screws a thousandth of an arcsecond, you can. The only problem is that you get to the point where you cant see if it still needs adjusting; The verification of whether its in the right place is FAR cruder than the mechanism of adjusting it.

Originally Posted by sp220

I personally was never that comfortable with a pocket held on by screws. But thats just me.

Look at the little silver bit that the limb peg sits in in your Inno; its just as tenuous a hold as that on an Ultra, Avalon or Kudos. That tiny silver bit is your "limb pocket held on by screws". Mechanically, same thing, different size..

[Scooter]

FWIW some risers have the stabilizer bushing puposely offset for balance reasons. The Best Zenit is such a riser. Lining up down the center of the longrod with it offset 1mm (I think) would be interetsing. Also it is posssible with some limb alignment systems to get the limbs and riser out of phase for lack of a better word. By that I mena it looks like the limbs are alignebed but the riser is actualy turned slightly.

Better to go with out limb alignment and shoot barebow I say.........

[BorderBows]

Originally Posted by sp220

I personally was never that comfortable with a pocket held on by screws. But thats just me.

If you look at the dynamics of the loads involved, the screws that are holding the limb pocket on are not the main load bearing ones. The pocket is just being pinched between the the limb butt and the riser. Its the limb preload bolt that under the load!. also, when you adjust the preload you change the angle that the limb sits at. for example. At minimum setting the limb butt might be parrallel to the limb bolt top. this is good!. At the max wound in position, the limb is in contact with one side of the bolt. This would add stress to the top of the limb bolt! Steel bolts hold, not sure if aluminium bolts would?

Anyhow!
If you need to align your limbs left to right. with shims/grub screws
And different risers need different preload, to achive the same tiller... meaning the limb pad angles are different riser to riser even on the same model and even top to bottom. With the Limb bolt adjusters.
Why assume that your riser is not rotationally out? You dont have adjusters for that?
Is this adjustment range just a sales ploy to make up for mass production?
Do you need left to right adjustment, or does it confuse you?
Tiller adjustment? is it something to fiddle with or does it add to your score?
If you want faster performance and accurate performance, then dont you need accurate machineing? not more adjusters?

[Joester]

Originally Posted by Scooter

FWIW some risers have the stabilizer bushing puposely offset for balance reasons. The Best Zenit is such a riser. Lining up down the center of the longrod with it offset 1mm (I think) would be interetsing. Also it is posssible with some limb alignment systems to get the limbs and riser out of phase for lack of a better word. By that I mena it looks like the limbs are alignebed but the riser is actualy turned slightly.

Better to go with out limb alignment and shoot barebow I say.........

I've got a Bernardini Nilo. The little booklet states that the limb alignment adjusters should come from the factory bang-on straight with the riser, and that if you find you need to adjust them, it's because your limbs are wonky.

I bought the riser and some Winact limbs at the same time, Winacts are, apparently pretty bloomin' straight...
I was suprised when CBA told me they were way out of alignment, but then they had screwed a longrod into the middle bushing to sight down, with Beiter limb gauges top and bottom.

I read afterwards that the longrod bushing is purposefully machined 3 degrees out from the riser!

However, I've left things as they are, as I seem to have a lovely centre-shot.

Perhaps that is because I shoot with both eyes open but let my right eye 'do the work', and, with the arrow in the corner of my mouth, the pupil of my right eye is about 15mm further to my right of the arrow/string, so my sight picture looks over the arrow very slightly from right to left.

Perhaps.