Bow tiller

[matt61]

Can someone tell me what is done different to a recurve bow when it is made to be shot three fingers under  compared to a split finger bow.
Thanks
Matt

[bamboo]

most bowyers do nothing different

[wingnut]

Matt,

We will tiller the bow to even for three under and 3/16 positive for split.

Mike

[graysquirrel]

Matt, I've 3 longbows and 1 widow tillered for 3 under.  Those are tillered even, or just the width of a paper matchstick difference witht the top limb being weaker.

The 5 widows I have tillered for split finger are 1/8th difference with the top limb being the weaker one.

Which actually is all somewhat silly since by adjusting the knock point up or down you actually change the tiller

[DCM]

"adjusting the knock point up or down"

With the caveat there's a practical limit in the down direction, or you begin to get interference between the arrow and shelf.  This is why some positive tiller ensures one can tune a bow for a particular archer, even if he does three under and/or heals or high wrists the bow hand.

Some bowyers will use a measure of geometry, the so called "shorter" lower limb which is actually a misnomer, but usually not on heavy risered glass bows with a distinct, cut in shelf.  Rather usually selfbows where there is more freedom to position the arrow pass to fine tune the tiller and nock point position to a particular archer.

[graysquirrel]

I've got some "friends" in Tennessee, an only there would they adjust the knock that far down. (Ha).

Funny thing though, on the bows "tillered" for 3 under, and the one's tillered for "split"fingered that I have the knocks on all but one are exactly at the same postition.  And that one bow is getting ready to be given to someone I don't like.

[matt61]

I am assuming that even tiller for three under means that if I measure in from the string to where the limb meets the riser top and bottom on a T/D recurve the measurement will be equal.
Matt

[graysquirrel]

Matt, they have to be just a bit unequal, if the limbs are reacting exactly the same, then handshock will result.  The timing of them has to be just a fraction of a second off.

[matt61]

Greysquirrel I measured my bow and the measurement from the string to where the limbs meet the riser was about a sixteenth of an inch less for the bottom limb.
Matt