Primitive Archer

Main Discussion Area => Bows => Topic started by: Rākau on September 25, 2018, 01:56:17 pm

Title: Compression fracture on the back (now with pics)
Post by: Rākau on September 25, 2018, 01:56:17 pm

So i was heat treating the belly of a stave of NZ beech because it has v bad compression resistance. And then for some unknown reason (i can get a tad impulsive at times, i was saying "dont do it, dont do it, dont do it" to myself over and over and then lo and behold it was done) i decided i should reflex the tips a little in my newly made caul. . . In the process i managed to get a chrysal on the back of the bow at the start of the bend which goes maybe a 3rd of the way accross the back. . . Bloody fool i know.

So what should i do.

A: tiller it out ignoring the chrysal and see how it goes?
B: sinew or some other patch in that area?
C: firewood?

Title: Re: Compression fracture on the back
Post by: upstatenybowyer on September 25, 2018, 03:46:21 pm

Pics!

Title: Re: Compression fracture on the back
Post by: Pat B on September 25, 2018, 04:37:24 pm

pics!

Title: Re: Compression fracture on the back
Post by: Rākau on September 25, 2018, 07:18:30 pm

haha sorry team I had pics on the way, quite hard to get photos to show on the very white wood but here we go. . .

this shows where in limb the chrysal is:
(https://farm2.staticflickr.com/1960/29982045237_5b4ce65c4f_c.jpg) (https://flic.kr/p/MFpPur)sketch-1537923192522 (https://flic.kr/p/MFpPur) by Zachary Press (https://www.flickr.com/photos/157468780@N02/), on Flickr

these three are the chrysal at different angles:
(https://farm2.staticflickr.com/1963/29982045487_73c35108e4_c.jpg) (https://flic.kr/p/MFpPyK)20180926_093716 (https://flic.kr/p/MFpPyK) by Zachary Press (https://www.flickr.com/photos/157468780@N02/), on Flickr
(https://farm2.staticflickr.com/1950/29982045577_1c6fbf90fd_c.jpg) (https://flic.kr/p/MFpPAi)20180926_093709 (https://flic.kr/p/MFpPAi) by Zachary Press (https://www.flickr.com/photos/157468780@N02/), on Flickr
(https://farm2.staticflickr.com/1978/29982045637_1a85cd8619_c.jpg) (https://flic.kr/p/MFpPBk)20180925_113243 (https://flic.kr/p/MFpPBk) by Zachary Press (https://www.flickr.com/photos/157468780@N02/), on Flickr


the back is decrowned and about 1 3/4" wide at the chrysal point. limb design is 2" to midlimb, strait taper to 1/2" nocks. ttt is about 65" and will have a slight bend in the handle.

Title: Re: Compression fracture on the back (now with pics)
Post by: osage outlaw on September 25, 2018, 08:49:50 pm

I would not trust that bow. 

Title: Re: Compression fracture on the back (now with pics)
Post by: Pat B on September 25, 2018, 09:41:16 pm

I wouldn't trust it either.

Title: Re: Compression fracture on the back (now with pics)
Post by: Rākau on September 26, 2018, 12:01:36 am

Thanks guys, your knowledge is appreciated, haha firewood it is!

Title: Re: Compression fracture on the back (now with pics)
Post by: George Tsoukalas on September 26, 2018, 06:38:28 am

Looks like you forced it. 
I usually don't do any reflexing until I am done long string tillering.
That way the wood is thin enough.
I am not sure why you left the tips so thick.
But anyway...  it is toast.
Jawge

Title: Re: Compression fracture on the back (now with pics)
Post by: Pat B on September 26, 2018, 07:45:12 am

Save the good limb and handle. You may be able to splice another limb on it at a later date...or make an atlatl out of either limb.

Title: Re: Compression fracture on the back (now with pics)
Post by: Rākau on September 26, 2018, 03:31:20 pm

Yeah i must definitly have forced it George, the other side bent just fine though. Tips are still thick cause it is just at floor tiller, i seem to thin them out later in the process.

Yeah thanks Pat, cutty cutty to stop me from just going for it anyway haha