Author Topic: Early tiller check and heat treat colour change  (Read 2326 times)

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Offline Rākau

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Early tiller check and heat treat colour change
« on: May 31, 2018, 01:04:54 am »
Hey there Primitive Archer team

Just putting this up for some hopeful feedback, please be ruthless haha.
Kanuka stave selfbow, 68" ntn, aiming for 50# but I don't have any scales so I think I will put this on hold until some scales arrive.

side view unstrung
20180531_165615 by Zachary Press, on Flickr

belly view unstrung
20180531_165513 by Zachary Press, on Flickr


 A wee bit of wonk in the stave, mainly the hump on the left hand side just out of the handle fade and the slight reflex/up sweep on the right hand limb tip, so that is making my tillering job interesting

low brace
20180531_174532 by Zachary Press, on Flickr

about 16" from low brace
20180531_173535 by Zachary Press, on Flickr

At this point it was pulling about 20 kg. . . so 44 lbs at 18" before I heat treated (I hung a 20 litre oil container off the string because I don't have scales yet) and I have not measured weight again or re-strung after heat treat.



Also not sure it if it was the correct time to do this but I heat treated both limbs. About 30 mins of constant movement per limb with the heat-gun. There was quite a colour change and a wonderful smell.

before heat
20180531_160902 by Zachary Press, on Flickr

after heat
20180531_164400 by Zachary Press, on Flickr

Thanks in advance for any feedback or advice that is given. . . as I said, please be ruthless.

Zach
« Last Edit: May 31, 2018, 01:12:41 am by NZnuka »

Offline Del the cat

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    • Derek Hutchison Native Wood Self Bows
Re: Early tiller check and heat treat colour change
« Reply #1 on: May 31, 2018, 01:17:30 am »
Looking good.
The heating sounds and looks about right... Take care to keep the heat off the back. I clamp thin slats of timber to the sides, that keeps the hot air flowing along the belly, gives a more even heat and speeds up the process just a tad... mind it's never going to be quick. If it's quick you are doing it wrong (ain't that the truth?  ::) )
Del
Health warning, these posts may contain traces of nut.

Offline GlisGlis

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Re: Early tiller check and heat treat colour change
« Reply #2 on: May 31, 2018, 01:41:24 am »
Nice bow.
You may use a scale for people
Use a graduated shaft pointing the scale and subtract the bow weight. It's not the more comfortable solution but it works

Offline simk

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Re: Early tiller check and heat treat colour change
« Reply #3 on: May 31, 2018, 02:01:52 am »
Hi Zach
Nice Bow! As you asked for ruthless comments:
I'd maybe do handle a little bit wider.
The whole bending sections seem rather short - if this bow will work out with a 28 draw Kanuka must be great bowwood.
Go on building bows!
Cheers
--- the queen rules ----

Offline Rākau

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Re: Early tiller check and heat treat colour change
« Reply #4 on: May 31, 2018, 06:47:53 pm »
Looking good.
The heating sounds and looks about right... Take care to keep the heat off the back. I clamp thin slats of timber to the sides, that keeps the hot air flowing along the belly, gives a more even heat and speeds up the process just a tad... mind it's never going to be quick. If it's quick you are doing it wrong (ain't that the truth?  ::) )
Del

haha or you are doing it very right. . .   :G
Thanks Del I will give that a go on my next one, I have another stave from the same tree roughed out into a more conventional flatbow shape


Nice bow.
You may use a scale for people
Use a graduated shaft pointing the scale and subtract the bow weight. It's not the more comfortable solution but it works

oh true thanks GlisGlis, I will give that a go if my scales haven't arrived after my trip away.


Hi Zach
Nice Bow! As you asked for ruthless comments:
I'd maybe do handle a little bit wider.
The whole bending sections seem rather short - if this bow will work out with a 28 draw Kanuka must be great bowwood.
Go on building bows!
Cheers

Thanks simk, the handle is 1 1/4" wide, so I'll aim for 1 3/4" on the next one.
oh dear  )-w( haha I will put a face shield on when I start pulling it past 20" then! thanks for the feedback.

Offline aaron

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Re: Early tiller check and heat treat colour change
« Reply #5 on: May 31, 2018, 07:34:03 pm »
Looks great so far. If i had to be ruthless I'd say your levers are too thick.
Ilwaco, Washington, USA
"Good wood makes great bows, but bad wood makes great bowyers"

Offline Rākau

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Re: Early tiller check and heat treat colour change
« Reply #6 on: May 31, 2018, 11:15:08 pm »
Hey Thanks for that aaron, I'll reduce them down once I have her all tillered up (if this stick will bend that far)

Zach

Offline simk

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Re: Early tiller check and heat treat colour change
« Reply #7 on: June 01, 2018, 04:51:28 am »
1 1/4" should be nice for the handle - I obviously was cheated by that pic...
Looking forward for a Kazuka bow now!
--- the queen rules ----

Offline S.C. hunter

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  • does a possum have enough brains to tan his hide ?
Re: Early tiller check and heat treat colour change
« Reply #8 on: June 01, 2018, 06:09:54 am »
lookin good to me, will agree the levers are looking a little thick, but I know you aren't done yet.
  Can you give us some dimensions of the bow?
   Steve

Offline Rākau

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Re: Early tiller check and heat treat colour change
« Reply #9 on: June 01, 2018, 07:34:35 pm »
  Can you give us some dimensions of the bow?

Off the top of my head its 68" ntn, the working limbs are about  2" wide and levers are 1 " at the moment. I think working limbs are 15" long and levers are 12". Handle is 5" i think. . . I'm away from home for a week so can't remember exact dimensions.

Zach