Author Topic: Top limb longer than bottom - tillering review requested  (Read 4481 times)

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Offline Knoll

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Top limb longer than bottom - tillering review requested
« on: September 27, 2014, 03:25:33 pm »
Making a bow with top limb 1" longer than bottom.  Bow specs as follows:
Objective: 30-33# @ 26"
Length ttt: 60"
Length ntn: 59"
Riser is 8" long: Handle=4 & Fades=2
Width @ fades: 1 5/8"
Width @ tips: 1/2"
For both limbs, width is 1 5/8" until 12" from tip, then tapering to 1/2"
Glue-on recurve tips

Here's tiller pic.  Brace height is 4 3/4", draw is 19", & DW=28#


Though the tips are at the same level, appears to me that left (shorter) limb is bending significantly more than right.  If limbs were of equal length I'd definitely be making that right limb bend more.  But, due to unequal limb lengths, I'm uncertain what/where I need to remove wood.

Help would be appreciated!
« Last Edit: September 27, 2014, 08:15:35 pm by Knoll »
... alone in distant woods or fields, in unpretending sproutlands or pastures tracked by rabbits, even in a bleak and, to most, cheerless day .... .  I suppose that this value, in my case, is equivalent to what others get by churchgoing & prayer.  Hank Thoreau, 1857

Offline bubby

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Re: Top limb longer than bottom - tillering review requested
« Reply #1 on: September 27, 2014, 03:48:12 pm »
well the bottom limb is shorter, and the are bent level or the same area of deflection, the short limb is gonna bend more to get to the same spot rrrright
take a yumi for example, although more drastic the top long limb bends less than the bottom, look's pretty good hows it feel shooting it
failure is an option, everyone fails, it's how you handle it that matters.
The few the proud the 27🏹

Offline simson

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Re: Top limb longer than bottom - tillering review requested
« Reply #2 on: September 28, 2014, 03:18:37 am »
Knoll, if I were you I would not hold that bow that long on the tiller board at fulldraw. I personally don't like that tillerboards, I use it mostly only for measureing the drawweight. Switch over to the mirror (a large one), watch yourself while drawing. You will notice this is something different. Watch if the limbs work where you want it to work

Here in this case you have an asym. bow, but the position on the board is like a sym. bow. The bow doesn't rest at the pivot point and the hook isn't there wherw the fingers pull the string.

Draw the bow and close your eyes, concentrate on where the bow wants to go. You will feel the weak limb (tends to go away from you). you also feel easily if a bow wants to twist (needing string alignment).
Simon
Bavaria, Germany

Offline bubbles

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Re: Top limb longer than bottom - tillering review requested
« Reply #3 on: September 28, 2014, 11:24:31 am »
I've made a few assymetrical bows lately, I like 'em.  I like to go for a positive tiller when the top limb  is longer, so the top limb ends up working a bit harder, which would mean a few scrapes off the right limb.  But like Simson said, you only get a real sense of the FD when it's in your hand,not the tree.

Offline bradsmith2010

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Re: Top limb longer than bottom - tillering review requested
« Reply #4 on: September 28, 2014, 02:49:46 pm »
i agree the top should work more,, and not to leave it on the tree ,, using a pulley will help with string follow ect,, if you make the bottom work too hard it will take some set and you will loose your positive tiller

Offline PEARL DRUMS

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Re: Top limb longer than bottom - tillering review requested
« Reply #5 on: September 28, 2014, 05:19:02 pm »
Left limb is close, work an area 2-4" long starting 8" from your tip. Right limb is stiff as a board in the center 10".
Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.

Offline Badger

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Re: Top limb longer than bottom - tillering review requested
« Reply #6 on: September 28, 2014, 05:31:13 pm »
     I would check the bow more like where you will be holding it, the string hook I would move more to the top and I would slide the bow over to the left a little more.

Offline Knoll

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Re: Top limb longer than bottom - tillering review requested
« Reply #7 on: September 28, 2014, 06:35:15 pm »
« Last Edit: September 28, 2014, 11:26:18 pm by Knoll »
... alone in distant woods or fields, in unpretending sproutlands or pastures tracked by rabbits, even in a bleak and, to most, cheerless day .... .  I suppose that this value, in my case, is equivalent to what others get by churchgoing & prayer.  Hank Thoreau, 1857

Offline Hamish

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Re: Top limb longer than bottom - tillering review requested
« Reply #8 on: September 28, 2014, 08:12:41 pm »
Another thing to keep an eye out for is set. If the set of the limbs is roughly equal that is a good sign, a little more set in the top limb is also fine( up to3/8") A big discrepancy in set and it will tell you that the limb with more set is doing more than its fair share of work.
 Hamish.

Offline Knoll

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Re: Top limb longer than bottom - tillering review requested
« Reply #9 on: September 28, 2014, 11:25:13 pm »
Thanks all for the inputs.

Here she is ... 34# @ 26".  After shooting about 50 arrows through it have 1 1/2" of set.

... alone in distant woods or fields, in unpretending sproutlands or pastures tracked by rabbits, even in a bleak and, to most, cheerless day .... .  I suppose that this value, in my case, is equivalent to what others get by churchgoing & prayer.  Hank Thoreau, 1857

Offline PEARL DRUMS

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Re: Top limb longer than bottom - tillering review requested
« Reply #10 on: September 29, 2014, 07:06:13 am »
Not to shabby sir.
Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.

Offline George Tsoukalas

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Re: Top limb longer than bottom - tillering review requested
« Reply #11 on: September 29, 2014, 08:24:28 am »
Came out great! Enjoy. Jawge
Set Happens!
If you ain't breakin' you ain't makin!

Offline Knoll

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Re: Top limb longer than bottom - tillering review requested
« Reply #12 on: September 29, 2014, 10:25:18 am »
Bow will be a gift for Carol's Uncle Harold.  He'll soon be 90 years on this earth and is Carol's last living uncle. 
Harold was a tournament shooter back in the day and I've enjoyed his story-telling of those days.  While this stick is no match for the Hoyt bows he once shot, I hope he gets a special kick from it.

Thanks, fellas, again, for taking a gander at my efforts and pointing the way.
In a couple days will start next one ... 45 lbs.  Working my way up to that Osage and that IPE board laying in the shop!
... alone in distant woods or fields, in unpretending sproutlands or pastures tracked by rabbits, even in a bleak and, to most, cheerless day .... .  I suppose that this value, in my case, is equivalent to what others get by churchgoing & prayer.  Hank Thoreau, 1857

Offline bradsmith2010

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Re: Top limb longer than bottom - tillering review requested
« Reply #13 on: September 29, 2014, 06:10:56 pm »
looks great congrats