Finally managed to bend tips - further guidance needed

[FilipT]

Short explanation:

Worked on my first black locust flatbow and I got the tiller even at 25" or so. I stopped because angle between tips and string become 90 degrees and if I would go till intended 28", it would be even greater. Since I before wanted a recurve, I decided to flip the tips so I could get rid of that bad angle and make my first recurve bow.
Suddenly there were lot of problems on bent shape. When I corrected them, new came in. That cycle continued for long and at the end I was left with thin bow that had torqued limbs and as a result string was not going through center like before. I threw the bow away as it didn't make sense to continue it.

How to prevent such errors in future? Any advice on when to flip the tips or how to watch shape when there are flipped tips?

Thanks

[Badger]

  A good way to prevent this from happening is to pull the bow to full weight the entire time through the tillering process but you have to make sure the entire limb doesn't have any weak spots in it when you start off.  No part of a limb will bend too far if it is too strong or stiff so you don't have to worry about that as long as you bring it down evenly.

[PatM]

How long was the bow?

[FilipT]

How long was the bow?

66 inches nock to nock.

[FilipT]

  A good way to prevent this from happening is to pull the bow to full weight the entire time through the tillering process but you have to make sure the entire limb doesn't have any weak spots in it when you start off.  No part of a limb will bend too far if it is too strong or stiff so you don't have to worry about that as long as you bring it down evenly.

That was probably the case. Even though I always use scale, this bow had a lot of waviness in the limbs, which I am not too experienced with so that created all kinds of trouble for me. Somewhere I probably left undulations too weak, somewhere too stiff, who knows. 

[PatM]

How long was the bow?

66 inches nock to nock.

 If your string angle was 90 degrees at 25 inches with a 66 inch bow then something was terribly wrong with your bend.

[Pat B]

Pics always help to determine the problems.

[aaron]

Yeah, start a new one nd post pics as you go. we will help you!

[Julian]

How long was the bow?

66 inches nock to nock.

 If your string angle was 90 degrees at 25 inches with a 66 inch bow then something was terribly wrong with your bend.

+1, or your handle section was much too long, perhaps

[FilipT]

If your string angle was 90 degrees at 25 inches with a 66 inch bow then something was terribly wrong with your bend.

I wouldn't use word terribly. I am not a complete beginner and terrible tiller doesn't really happen to me anymore. That being said, unfortunately I don't have any picture to show. But I can say this, whole limb bent, including tips. Tips were not stiff for couple of inches. That probably happened because of very thin limbs. This picture of someone's bow describes best how my tiller looked at 25". Notice the string angle.

[FilipT]

+1, or your handle section was much too long, perhaps

It wasn't. Handle was 4" and fades were 2" each.

[Pat B]

There was still 4" to 5" past the fades that was stiff.

[FilipT]

That is not my bow on picture; I put that picture to show you close approximation how my tiller looked like.

[Pat B]

If your bow looks like this one then my opinion stands. By getting those 10" or so near the handle bending the string angle will be changed and the bow can be drawn farther.

[FilipT]

Ok, tnx for advice, I am going to attempt another recurve, probably next week so I will post my progress.