« previous next »
Pages: [1]

Author Topic: + or - tiller problem  (Read 2301 times)

0 Members and 1 Guest are viewing this topic.

Offline DC

  • Member
  • Posts: 10,396
+ or - tiller problem
« on: November 16, 2014, 07:57:12 pm »
I am closing in on the latest bow. It's 90% (or so) tillered. I was measuring +- tiller and got it within 1/4" so I decided to make the + the top. I reversed the string, braced it and measured the tiller again. Now there is a full 1/2" difference. Reversed the string and it went back to within 1/4". I'm using a timber hitch at the bottom if that matters. What is doing this?
Logged

Offline huisme

  • Member
  • Posts: 1,036
  • I'm Marc, but not that Marc.
Re: + or - tiller problem
« Reply #1 on: November 16, 2014, 08:05:00 pm »
Diference in nock size/shape can throw it off by holding a different size loop higher/lower. Furthermore a timber hitch can hold the tip different than a loop would just hand from the nock.
Logged
50#@26"
Black locust. Black locust everywhere.
Mollegabets all day long.
Might as well make them short, save some wood to keep warm.

Offline DC

  • Member
  • Posts: 10,396
Re: + or - tiller problem
« Reply #2 on: November 16, 2014, 08:13:29 pm »
Thanks Marc. I wondered if that was it, that's why I mentioned that I was using a timber hitch. I'll leave it until I've shot a bunch of arrows. You wouldn't think it would make that much difference. Fussy little dickens, aren't they :)
Logged

Offline duke3192

  • Member
  • Posts: 195
  • pm109331
Re: + or - tiller problem
« Reply #3 on: November 16, 2014, 09:18:58 pm »
I don't use the timber hitch because of an inability to get it right, I've friends that do and they always put it on the top.
Logged
charter member of traditional bow hunters of Florida.

Offline Pat B

  • Administrator
  • Member
  • Posts: 37,667
Re: + or - tiller problem
« Reply #4 on: November 16, 2014, 09:55:23 pm »
Measuring +/- tiller on a braced selfbow is worthless IMO. The best place to see proper tiller is at full draw. Usually there are too many irregularities in selfbows to get a good reading at brace. That is a FG think. If you machine a bow, you can do that but not with selfbows. If your bow looks good all around at 90% completion I'd say take it out and shoot it.
Logged
Make the most of all that comes and the least of all that goes!    Pat Brennan  Brevard, NC

Offline huisme

  • Member
  • Posts: 1,036
  • I'm Marc, but not that Marc.
Re: + or - tiller problem
« Reply #5 on: November 16, 2014, 10:03:37 pm »
Good point pat, one of the things I've been having to do here in Nevada is just hope the tiller is positive when it feels right because I can't see full draw.
Logged
50#@26"
Black locust. Black locust everywhere.
Mollegabets all day long.
Might as well make them short, save some wood to keep warm.

Offline George Tsoukalas

  • Member
  • Posts: 9,425
    • Traditional and Primitive Archers
Re: + or - tiller problem
« Reply #6 on: November 17, 2014, 01:18:17 am »
Does the stave have any prop twists? Jawge
Logged
Set Happens!
If you ain't breakin' you ain't makin!

Offline DC

  • Member
  • Posts: 10,396
Re: + or - tiller problem
« Reply #7 on: November 17, 2014, 01:24:00 am »
Quote from: George Tsoukalas on November 17, 2014, 01:18:17 am
Does the stave have any prop twists? Jawge

No, it's quite straight.
Logged

Offline bradsmith2010

  • Member
  • Posts: 5,187
Re: + or - tiller problem
« Reply #8 on: November 17, 2014, 02:21:39 pm »
agree with Pat,, measuring a self bow at brace can be deceiving,, the way it looks at full draw is what counts,, you can use a pulley to get the basic idea,, put that will sometimes look different than drawn by hand,, best to take a pic at full draw to see that,,or have your expert peanut gallery comment  :) :) :)
Logged

Offline Badger

  • Member
  • Posts: 8,125
Re: + or - tiller problem
« Reply #9 on: November 17, 2014, 04:14:12 pm »
     Adjusting for a 1/2" positive or negative would cause a pretty high weight loss. I have cut 1" off the lighter limb a couple of times when I was too close to target weight. No comment on the string I use double loops on everything.
Logged

Offline Hamish

  • Member
  • Posts: 1,575
Re: + or - tiller problem
« Reply #10 on: November 17, 2014, 09:18:58 pm »
Has one limb taken significantly more set than the other? +1 for a  full draw with an arrow picture.
Logged

Offline George Tsoukalas

  • Member
  • Posts: 9,425
    • Traditional and Primitive Archers
Re: + or - tiller problem
« Reply #11 on: November 18, 2014, 03:09:55 pm »
When you reversed the string you put the timber hitch up top?
I
s there a bit of uneven wood removal going on here in that there is a difference in measurement depending on which side you measure? You may have a leaner. Had a few of those myself over the years.

Interesting problem.
It's  a mystery
Jawge
Logged
Set Happens!
If you ain't breakin' you ain't makin!

Offline DC

  • Member
  • Posts: 10,396
Re: + or - tiller problem
« Reply #12 on: November 18, 2014, 03:55:39 pm »
Here's some pictures. It looks to me like the top limb could use a couple of scrapes.
Logged

Stringman

  • Guest
Re: + or - tiller problem
« Reply #13 on: November 18, 2014, 04:07:15 pm »
Looks darn close. I might scrape the inners just a touch.
Logged
Pages: [1]
« previous next »