working on my sisters bow, i noticed it had a little prop twist to one of the limbs. i know it wont affect how it shoots, but how exactly do you get rid of it by tillering? i know you remove from one side but the explanations ive seen confused me. for example if you were looking down the back of the bow and it was leaning downward to the left, this means the left side is weaker and the right would be stronger and not pulling as far correct?
heres a pic i made to help, would side A be the stronger side and need material removed or would it be side B that would need scraped? (http://i342.photobucket.com/albums/o406/p0go333/limbtwist.jpg)
Unless its excessive there's no need to worry about it. How many degrees of prop twist? There's info on my site. Jawge
http://georgeandjoni.home.comcast.net/~georgeandjoni/aerobow.html
maybe ten degrees at most this one isnt too bad, but ive ran into worse that have became scrap because of twist and i dont have a heat gun right now or the ability to steam.
i read the info for aerobow awhile back when i first started building, that ones a really good example of why alot of us build, because it poses a unique challenge.
If your cross section is from the tip looking toward the handle, I would scrape side B. I remember this confused me for the longest time, and I finally took a bow of mine that I thought was ruined and just experimented with it until I figured it out. The good thing about propeller twists, though, is that since both limbs are twisting in opposite directions, the string usually tracks through the middle of the handle anyway, and you don't have to worry about it.
ah so its actually opposite of what youd think, the strong side pulls more tension. ill have to remember that. thanks for the clarification guys. the bow that has it right now isnt bad enough for me to worry about but i wanted to clear it up anyway while i was thinking about it, its something ive seen alot of people struggle with if they cant get rid of the twist with heat.
That's practically nothing. Don't give it another thought. IMHO. Do check tiller from both sides. Jawge
yea ive started using a level on the belly as im tillering to show me the high sides, i check the bench to make sure the spots level to begin with then check level on the bow. also i use my draw knife blade too by making sure im holding it straight and if it scrapes off one side more i work till its pretty level.