Ferret Friendship Bow: Finessing a Tiller

[Dano]

Must be the lighting in the pictures, the right limb looks stiffer, full draw the right looks stiffer as well.

[AZStickman]

You're seeing it right Dano.... Terry

[Dano]

Now I'm confused   :D  If the right limb is the upper, how can you have positive tiller? I'm missing something.

[George Tsoukalas]

Dano's right. Mid limb out right limb or make it the bottom limb. Looks good. jawge

[AZStickman]

Top limb is reading 5 3/8", 4" out from the fades and the bottom limb is at 5 7/8".....  

Bottom limb is positive not the top....      I've got some room to make adjustments but not much... I may wind up flipping them we'll see tomorrow...... Terry

[Dano]

Gotcha Terry  :D

[the Ferret]

Terry real tough to not pick up follow on a 59" bow pulling 27" that started out basically flat. Should be a smooth drawer and shoote though. Gosh that's making wood bend     (btw that's only 1" longer than the Torges bow challenge bow requirement)

[AZStickman]

Here's our starting profile for session 4 My goal this session is to get our tiller evened out and hopefully still make weight:

   

After some careful scraping on the top limb (right)I have a 3/16 negative tiller. The string alignment seems to favor the bottom limb up and the tiller is leaning the same direction so I'm going to go with it. the left limb is now officially my top limb... Just when I got Dano unconfused....Sorry Dano      :D      :

   

Here she is pulling 38#@26". Looks like I missed weight by a little. She kind of hits a wall at full draw due to the string angle:

   

And here's our finished session 4 profile:

   

   


Lessons learned:
For an Osage bow this short with a low target draw weight I'd make the limbs a little narrower next time. On a heavier bow you would still have enough thickness to keep the tillering relatively easy. With this bow my limbs finished out much thinner than I'm used to. The rule is twice as wide twice as strong but twice as thick 8 times as strong. So when you have thin limbs just a few shavings make a bigger difference.

Bow limbs run out of bend when the string angle hits around 90 degrees.... If you want to hit 27 or 28" on a short bow like this you need to flip the tips to keep the string angle down.

[mike hall]

Thanks for sharing Terry. Good stuff Bro.  

[NorthShoreLB]

I lost trak,... where's the upper limb?    


Nice !!


       manny

[AZStickman]

LOL.... Quit it Manny now I'm getting confused...and Thank You Mike.... BTW I just took a trick from Davids book and added the Limb on Limb combo pic to the session 4 post... Terry

[the Ferret]

ok Terry ..only one way to get the weight back up..elk sinew    

[AZStickman]

Mickey ya know me too well.... I've got some of the prettiest stripped Elk sinew you've ever seen that I've been saving for a special project... It might look familiar to you...    :D    I'm gonna go ahead and get the handle shaped and then get her backed .... This is my last Osage stave I've got to make it work.... Terry

[Linc]

WOW Terry.Looking good.Sure making those limbs bend.  

[Dano]

 Cool another builalong to look forward to. I'm cornfused all the time Terry it ain't your fault. BTW tiller looks great, too bad you missed wieght. Good lessons learned tho.

[George Tsoukalas]

Terry, you got a beautyful tiller. Well done.  Set happens.    Jawge

['46]

Terry, she's looking really fine bud. A little sinew will work it's magic and bring her up in weight. Nice bow and a fine tiller.

Was that stave one that I might know?    

[AZStickman]

George I was drawing a blank on where I got it... I think my memory was just jogged....  :D  Thanks Bud..... Terry

[NorthShoreLB]

Sinew now ??

    Looking forward to this.

  Manny