I'm working on this bow I posted about the other day. I've got it braced and bending fairly evenly now and thought I would post some pics for tiller feedback. This is a 62" NTN shooting for 50#@28". I forgot to taper the limbs before gluing up so the r/d came out weird...more pronounced on the lower limb.
Here it is unbraced (not the uneven r/d):
(http://i33.photobucket.com/albums/d83/skendrot/IMG_1793.jpg)
Braced:
(http://i33.photobucket.com/albums/d83/skendrot/IMG_1790.jpg)
Drawn to 50# at 22":
(http://i33.photobucket.com/albums/d83/skendrot/IMG_1792.jpg)
Drawn to 50# at 23":
(http://i33.photobucket.com/albums/d83/skendrot/IMG_1794.jpg)
looks good to me. keep bending her.
Very nice
If the lower limb is left, I'd check the tiller measure. It seems to bend more generously on the inner and mid limb. But it is very, very close. Also time to be shooting the bow and getting tiller clues from that, and whatever set it takes from that work. Tiller board isn't always just like drawing by hand. If you need more draw lenght, I'd take it from the inner limbs. The stiff section in the center seems overly generous for a 62" bow. Very good start.
Thanks for the feedback. Had to put on hold till next week. Hope to finish it then.
Update! Finally. I've got it pulling 50#@26" now. only 2 inches to go. This bow is a weird one. Its 62" NTN so its bending a lot more than I am used to. Gizmo is not showing me stiff spots. I could use some extra eyes on this one. How's it look.
Braced (forgot to level it)
(http://i33.photobucket.com/albums/d83/skendrot/BBO05_50at26_braced.jpg)
50#@26"
(http://i33.photobucket.com/albums/d83/skendrot/BBO-05_50at26.jpg)
Its got some thickness anomalies which don't appear to cause a hinge. They sure are distracting though.
(http://i33.photobucket.com/albums/d83/skendrot/BBO05_Limb_Var.jpg)
You still have the lower limb softer about 2 inches out from the fade. That thin spot is the culprit.
Your upper limb needs the be lightened from the fade to out just past the screw holding your board up to even things up.
Brace the bow and trace the limbs on paper. Trace one limb, then trace the other directly over the top of the first. Use the string as your guide to line them up. I think you'll see where you need to go from what you see there.
Remember, for a good shooting bow that lasts a long time, tiller is always more important than weight.
How do you account for the different limb lengths when tracing on paper? Do line up the apex of string and limb?
I was looking to remove more wood from the upper limb near the fade, but wanted to get other opinions before I went to crazy. Thanks for the feeback.
For different limb lengths, just line them up so the angle from the string to bow tip is in the same place. The line from tracing the string should be the same from one limb to the next.