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Hickory Dickory Tiller Check
Del the cat:
AROOGAH AROOGAH! OVERTHINK ALERT! ::)
Sheesh JW that tiller is sweet... step away from the bow, drop that scraper and keep your hands where we can see them!
Del ;D
superdav95:
--- Quote from: JW_Halverson on April 02, 2024, 12:49:08 pm ---
--- Quote from: Pat B on April 02, 2024, 10:47:21 am ---Proper tiller is what you have at full draw and not necessarily at brace.
--- End quote ---
Limb to the right is top limb, left is bottom.
It's just weird to me that a limb would be showing too weak at brace and too strong at draw! I have had this happen before, but nowhere as extreme as this.
I guess I can flip it over since I never cut in shelves. The upper limb is one inch longer, but I suppose I could trim that inch off and fiddle with tiller once I have heat treated.
--- End quote ---
JW. I’ve had this before too. It’s frustrating. I find I get this one bows that I heat treated with a heat gun. I suspect that an in consistent heat treatment may be related or somehow causing one limb being stronger or weaker at full draw. I find less of this with hot coal bed heat treat fyi. I know you have not heat treated yet but something to keep in mind when or if you do. I don’t know that I would mess with this tiller as it is and heat treat it and reassess things. It looks very good and it dose t appear you have taken much set either! Will you induce some reflex when you heat treat???
Kidder:
To me the tiller looks pretty solid. I’d probably take a couple scrapes mid limb on the left - there is something difficult for me to put my finger on that my eyes keep coming back to in that spot. I tend to keep the bend a little more out of my fades than you have it on your left limb but I think this is more preference than anything. However, might be what is causing the difference from strung and drawn tiller.
You might try hand tillering it from here though (photograph the bow drawn in your hand and tiller off of that). How the bow sits in your hand and how your fingers grasp the string will change the pressure point from where it sits on a tillering rack and with a single hook drawing it, which will change how it ultimately bends. I am a believer that at this stage you can learn way more by feeling the pressures in your hand, combined with photos of the bow drawn than you can from even the best designed tillering racks.
The last thing worth mentioning is that I think you are right in considering trying to correct the strung versus drawn tiller. I can’t say with certainty, but i believe this sort of issue affects limb timing on self bows. Limb timing issues will effect nock travel which creates its own issues on arrow flight. This may be an issue, it may not, but you won’t know until you’re shooting it. And that is also just my theory!
I’m excited to see this bow! Keep up the great work and keep us posted.
Gordon:
I used to heat treat regularly, but stopped because it generally mucks up the tiller forcing me to redo it with questionable benefits. Since stopping, no one who shoots my bows has complained or even noticed that the bows are not heat treated.
JW_Halverson:
--- Quote from: Del the cat on April 02, 2024, 04:14:14 pm ---AROOGAH AROOGAH! OVERTHINK ALERT! ::)
Sheesh JW that tiller is sweet... step away from the bow, drop that scraper and keep your hands where we can see them!
Del ;D
--- End quote ---
;D
--- Quote from: superdav95 on April 03, 2024, 10:58:20 am ---
--- Quote from: JW_Halverson on April 02, 2024, 12:49:08 pm ---
--- Quote from: Pat B on April 02, 2024, 10:47:21 am ---Proper tiller is what you have at full draw and not necessarily at brace.
--- End quote ---
Limb to the right is top limb, left is bottom.
It's just weird to me that a limb would be showing too weak at brace and too strong at draw! I have had this happen before, but nowhere as extreme as this.
I guess I can flip it over since I never cut in shelves. The upper limb is one inch longer, but I suppose I could trim that inch off and fiddle with tiller once I have heat treated.
--- End quote ---
JW. I’ve had this before too. It’s frustrating. I find I get this one bows that I heat treated with a heat gun. I suspect that an in consistent heat treatment may be related or somehow causing one limb being stronger or weaker at full draw. I find less of this with hot coal bed heat treat fyi. I know you have not heat treated yet but something to keep in mind when or if you do. I don’t know that I would mess with this tiller as it is and heat treat it and reassess things. It looks very good and it dose t appear you have taken much set either! Will you induce some reflex when you heat treat???
--- End quote ---
I used my standard 1" reflex jig when I heat treated the limbs. And no, this one did not take a whole lot of set, but I didn't do a lot of pulling before I got to this stage.
I really need to set up a full-length mirror in the garage for what you call hand tillering. I maybe should also figure out how to set my camera up to take timer photos, too, so that I can get pics when pulling in hand.
--- Quote from: Gordon on April 04, 2024, 03:52:04 pm ---I used to heat treat regularly, but stopped because it generally mucks up the tiller forcing me to redo it with questionable benefits. Since stopping, no one who shoots my bows has complained or even noticed that the bows are not heat treated.
--- End quote ---
No idea where this bow is gonna end up landing, but most likely it will be somewhere with higher humidity than I have here and heat treating is supposed to cut back on the effects of humidity on hickory and other white woods.
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