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HLD Layout and tiller question
bownarra:
--- Quote from: bradsmith2010 on May 06, 2022, 04:39:42 pm ---cant see any reason the thickness could not be reduced near handle and handle,,
--- End quote ---
with a parallel width limb design it shouldn't bend much near the handle or else it will take set there and handshock will raise its ugly head. Jim describes correct tiller for this width profile above.
Tiller logic - in the the trad bowyers bible.
backtowood B2W:
--- Quote from: bownarra on May 13, 2022, 02:47:21 am ---
--- Quote from: bradsmith2010 on May 06, 2022, 04:39:42 pm ---cant see any reason the thickness could not be reduced near handle and handle,,
--- End quote ---
with a parallel width limb design it shouldn't bend much near the handle or else it will take set there and handshock will raise its ugly head. Jim describes correct tiller for this width profile above.
Tiller logic - in the the trad bowyers bible.
--- End quote ---
Hm, canīt feel handshock , or lets say, not more shock than before. Maybe I had just enough to play with. To relieve some strain from the outers was a good move, because i have a fret at a knot in the outer, and the other outer started to get too much set.
Iīm not sure if I was clear enough about my thinking that an HLD with parallel width design acts more like a pyramid.
I drew a sketch - sometimes a pic tells more than 1000 words...
The typical stave for HLD is a small diameter sapling which tapers mostly from one end to the other - to get parallel width you have to trim let, say about 3/4 from the stave length. This results into higher sidewalls towards handle - at least in my bow.
bradsmith2010:
I think it could bend a bit more near handle,,,, in theory, I agree with bownarra
I was friends with Jim ,, have that book,, there is room or interpretation on some tiller logic,,
Jim taught me how to make a bow ,, 30 something years ago,, I did some things he told me not to do ,, and they worked,,but in general he was right,, and I still follow his teaching to this day,,
and thats kind of how bow making is,, not all rules are definitive,, or there might be some room for variation,,
bownarra:
Well I've never made one of these hld designs and I don't think I ever will! BUT tiller logic is simply another way of saying that wood at a given thickness has a given strain or bend it can take. Thicker can't take as much bend, thinner can take more. The wood doesn't care what design it is in. All that matters is strain levels. Our job when making different designs is to find that perfect strain level - it is dictated to us by wood species and thickness, watching set and its posistion will always give you the right 'answer'. As I've said many times draw the orginal profile on a wall/tillering boards etc. So you have a definite reference to check back to during tillering........the wood never lies about what it thinks of your tiller :)
backtowood B2W:
--- Quote from: bownarra on May 14, 2022, 02:33:02 am ---Well I've never made one of these hld designs and I don't think I ever will! BUT tiller logic is simply another way of saying that wood at a given thickness has a given strain or bend it can take. Thicker can't take as much bend, thinner can take more. The wood doesn't care what design it is in. All that matters is strain levels. Our job when making different designs is to find that perfect strain level - it is dictated to us by wood species and thickness, watching set and its posistion will always give you the right 'answer'. As I've said many times draw the orginal profile on a wall/tillering boards etc. So you have a definite reference to check back to during tillering........the wood never lies about what it thinks of your tiller :)
--- End quote ---
Would love to see a HLD Bow from you! Maybe sometime you will be in the mood for it. But I understand; This is my 4th - and I broke two. And this are all not real HLD more semi HLD - so the "flattening out effect" is not noticeable. Not the easiest build in bow making...
About tiller logic I totally agree with you. Also, I do draw the orig. profile to a paper roll for reference, but more with the curvier ones - this one is so straight you can detect set easy. I think the tiller is still quite elliptical - and set is distributed better than before .
It took 18mm set going back to 4mm when resting. ;D
--- Quote from: bradsmith2010 on May 09, 2022, 04:09:18 pm ---you can probably narrow the arrow pass a little,,
--- End quote ---
That and some adjustments at the nock sorted out this string alignment issue. The bow is a tiny bit twisted.
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