Author Topic: Tiller Help  (Read 1278 times)

Offline YosemiteSam

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Tiller Help
« on: April 18, 2018, 11:41:51 AM »
Now that my busy season is behind me, I've been able to refocus some of my efforts on this looming bow project.  Last weekend, I got a new bow roughed out, floor tillered, backed with hickory and on the tree.  However, I can't quite figure out what's happening here.  Both limbs come out pretty close to evenly bending on the gizmo (evenly down the length but uneven with each other) with a little work to do in the last 6-8" of the tips.  Yet the upper limb (right) is showing very stiff compared to the lower limb (left).  From brace, moving 9" out from center, the string is about 5/16 higher on the lower limb.  If I use my hands & force more of a bend in the upper limb (right), then the limbs tend to even out more -- relaxing the lower limb.

I'm thinking that I need to scrape down the entire length of the upper limb (right) until they bend more equally but would like some input from the more experienced folks in the group before I continue scraping.  My bows don't usually come out this wonky but this is as far as I've gotten with backed boards & glued-in reflex.

The bow is 68" hickory-backed maple with about 2.5" of reflex glued in (got more clamps this time).  You'll have to excuse my tillering tree -- it's far from straight and the lines behind it mean nothing. 
"A good hunter...that's somebody the animals COME to."
"Every animal knows way more than you do." -- by a Koyukon hunter, as quoted by R. Nelson.

Offline macbow

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Re: Tiller Help
« Reply #1 on: April 18, 2018, 11:45:17 AM »
I think your on the right track.
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Offline BMorv

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Re: Tiller Help
« Reply #2 on: April 18, 2018, 01:04:14 PM »
Yep, you got it.  I like to be within 1/8" tiller one way or the other before I really start pulling on the bow.  I measure tiller right where the fades end.  Do 10 scrapes on the strong limb, exercise the bow well, and recheck tiller. 
Not sure which way you plan to tiller, but make sure your cradle point, pull point, and pulley location are where you intend them to be.  Setting any of those points even a half inch different than your intention will show one limb stronger than the other. 
Life is too short to use marginal bow wood

Offline BMorv

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Re: Tiller Help
« Reply #3 on: April 18, 2018, 01:29:58 PM »
Now that I think about it, I made too many assumptions about your tiller method to answer your question properly. 
I tiller for equal limb timing so I match my tree and pull points exactly how I plan to draw the bow when shooting.
If you set your tree up this way you want to just make sure the rope pulls down in a straight line.  It will sway towards be stronger limb.  Make sure it pulls down in a straight line and your bow is balanced for the way you shoot.  Tiller + or - doesn’t matter. 
I need to know more about your tiller method and your goals to give an answer.  If you are just asking about which limb is stronger relative to each other, then yes you got it right. 
Life is too short to use marginal bow wood

Offline Pat B

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Re: Tiller Help
« Reply #4 on: April 18, 2018, 05:34:40 PM »
Both limbs are stiff right off the fades. The left limb is starting to hinge just past that and the outer limbs are stiff.
Make the most of all that comes and the least of all that goes!
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Offline BMorv

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Re: Tiller Help
« Reply #5 on: April 18, 2018, 05:40:30 PM »
And sorry for my rambling if you are just looking for tiller advice.  I agree with Pat's assessment although I'm not really seeing the hinge.  The right inner looks more stiff than the left and that may be where the limb strength difference is. 
 
Life is too short to use marginal bow wood

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