Author Topic: Prop twist in staves, what is your first hand experience?  (Read 6616 times)

0 Members and 1 Guest are viewing this topic.

Offline dwardo

  • Member
  • Posts: 1,456
Prop twist in staves, what is your first hand experience?
« on: December 29, 2011, 09:45:41 am »
Hi all,

I was wondering what kind of prop twist you have all had to deal with in the past?
What kind of degree will you just huff at and think "life is too short"
What are your tips for removing the twist or just living with it?

Just a general discussion point, cheers all :)

Offline PEARL DRUMS

  • Member
  • Posts: 14,079
  • }}}--CK-->
Re: Prop twist in staves, what is your first hand experience?
« Reply #1 on: December 29, 2011, 10:03:26 am »
I used to leave it in if stringing the bow wasnt a problem. I straighten every bow I build now.  I want them flat when I tiller. I found it hard to keep my taper even when the limb twists. I would get thin spots here and there.
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 artcher1

  • Member
  • Posts: 1,114
Re: Prop twist in staves, what is your first hand experience?
« Reply #2 on: December 29, 2011, 10:19:35 am »
Any limb twist is just another source of limb vibration/hand shock IMO. Don't much care for it myself..........Art

Offline adb

  • Member
  • Posts: 5,339
Re: Prop twist in staves, what is your first hand experience?
« Reply #3 on: December 29, 2011, 01:00:40 pm »
A little bit of prop twist is no big deal. It looks abnormal, but doesn't affect how the bow shoots. A small amount is not worth correcting, as long as the string stays in the middle of the bow. Most prop twist only happens at max full draw. I haven't noticed any difference in hand shock.

Offline George Tsoukalas

  • Member
  • Posts: 9,425
    • Traditional and Primitive Archers
Re: Prop twist in staves, what is your first hand experience?
« Reply #4 on: December 29, 2011, 02:04:07 pm »
I used to leave it if it was less than 35 degrees or so with no problems. These days I've started heating it out. Like this. Just add water from another container. Jawge

Set Happens!
If you ain't breakin' you ain't makin!

Offline JW_Halverson

  • Member
  • Posts: 11,923
Re: Prop twist in staves, what is your first hand experience?
« Reply #5 on: December 29, 2011, 02:15:23 pm »
If there is more than 120 degrees of prop twist I am out the door with saw in hand hunting the next stave.  I do have SOME standards, you know!

The stave with the 120 degrees of twist was a narrow osage stave with the twist distributed evenly from one end to the next, no knots, no pin knots.  I chased a ring, found the center line, and drawknifed it into the profile of an ELB.  I squared the belly with the sides and got ready to unscrew it.  I started in the middle using a heat gun and a pipe wrench.  I hung a weight off the end of the pipe wrench like George shows in his photo (all great minds think alike, and all fools fail in similar fashion).  I unscrewed it one foot at a time over several days.  I wound up with a little prop twist left in it but I was just happy I hadn't blown it. 

Now 90 degrees of twist in just a foot of limb would be a challenge!  Kinda like some of gstonebergs mutant osage!  His stuff's so bent that if you was to burn it the heat would go sideways and the smoke would try to down thru the ground!
Guns have triggers. Bicycles have wheels. Trees and bows have wooden limbs.

Offline sadiejane

  • Member
  • Posts: 1,030
Re: Prop twist in staves, what is your first hand experience?
« Reply #6 on: December 29, 2011, 02:39:25 pm »
much as described above. took this twisted piece o wood and got it flat.
did it over a week with numerous heatings.


the eventual bow-it had numerous other issues to go along with the twist. but has held up so far....

have only made a few bows, but all cept one needed some twist taken out with heat
this being the most extreme
wild women don't get the blues

Offline dwardo

  • Member
  • Posts: 1,456
Re: Prop twist in staves, what is your first hand experience?
« Reply #7 on: December 29, 2011, 03:00:20 pm »
Thanks for the comments all.
My main reason for asking is I have a few twisty staves sat in the naughty corner which i just keep avoiding.
I have in the past taken out tiny amounts of twist but never gone the whole hog and takenout anything more than 30 deg or so of twist. In say a gentle 45 deg of twist over a full 60" would it be possible to just ignore the grain and make it flat or would that much run out just be gambling... I dunno but worthy of thought.



Offline Del the cat

  • Member
  • Posts: 8,322
    • Derek Hutchison Native Wood Self Bows
Re: Prop twist in staves, what is your first hand experience?
« Reply #8 on: December 29, 2011, 05:23:03 pm »
This thread shows how I made a bow with a fair amount of twist and just worked with it. It's probably the best shooting bow I've made, fast and it groups nicely.
http://www.primitivearcher.com/smf/index.php/topic,28324.0.html
Del
Health warning, these posts may contain traces of nut.

Offline dwardo

  • Member
  • Posts: 1,456
Re: Prop twist in staves, what is your first hand experience?
« Reply #9 on: December 30, 2011, 12:58:09 pm »
I forgot that one had so much twist Del, thanks for posting it.
Well i have two almost identical staves from the same sapling, both with the same twist so in teh interest of experimentation i will completely ignore it on one and follow it on the other. Bout time i blew a bow anyways ;)

Offline Del the cat

  • Member
  • Posts: 8,322
    • Derek Hutchison Native Wood Self Bows
Re: Prop twist in staves, what is your first hand experience?
« Reply #10 on: December 30, 2011, 02:55:14 pm »
keep a fair bit of width on the tips to start with so you can adjust the position of the knot/sting alignment as there is bound to be some lateral movement as you are tillering it.
Getting it to come back straight needs some patience/luck/skill/cussing.
Del
Health warning, these posts may contain traces of nut.

Offline Buckeye Guy

  • Member
  • Posts: 3,033
Re: Prop twist in staves, what is your first hand experience?
« Reply #11 on: December 30, 2011, 03:37:35 pm »
dwardo
Just don't blow the wrong one and
 prove us that like to take the twist out to be doing it wrong ! >:D
Guy
Guy Dasher
The Marshall Primitive Archery Rendezvous
Primitive Archery Society
Having  fun
To God be the glory !

Offline toomanyknots

  • Member
  • Posts: 3,132
Re: Prop twist in staves, what is your first hand experience?
« Reply #12 on: December 30, 2011, 07:18:46 pm »
Whoa, Del that bow is gorgeous. Where do you buy your horn?
"The way of heaven is like the bending of a bow-
 the upper part is pressed down,
 the lower part is raised up,
 the part that has too much is reduced,
 the part that has too little is increased."

- Tao Te Ching, 77, A new translation by Victor H. Mair

Offline Del the cat

  • Member
  • Posts: 8,322
    • Derek Hutchison Native Wood Self Bows
Re: Prop twist in staves, what is your first hand experience?
« Reply #13 on: December 30, 2011, 07:43:31 pm »
Whoa, Del that bow is gorgeous. Where do you buy your horn?
Highland Horn in the UK.
Del
Health warning, these posts may contain traces of nut.

Offline gstoneberg

  • Member
  • Posts: 3,889
Re: Prop twist in staves, what is your first hand experience?
« Reply #14 on: December 30, 2011, 07:59:27 pm »
I heat twist out of virtually every bow I build. The only problems I have are when I want to make 2 corrections in the same spot, ie take out twist and flip the tip. In that case it's best to wait until you can do them both at the same time. A caul is helpful then.

George
St Paul, TX