Delamination in recurve

[Elison]

Hi guys!

I'm trying to make a recurve bow using a bingham plan, but when I started to bend the wood and the glass started to delaminate in 2 points:

 

 

 

 

Any idea in how I can fix it?     :confused:  

Thanks

[Wolftrail]

Not sure but maybe bad glue, prep surfaces rougher, large gaps perhaps....    :confused:
Not sure about fixng it,  sure others will chime in.

[mikkekeswick]

You can't fix it now i'm afraid....time to start again.

[JamesV]

Option 1: If the fades are not damaged you can strip the riser and rebuild the bow. Be sure to wipe down the riser, lams and glass with acetone and wear gloves to do the glue-up.

Option 2: The core does not appear to be damaged, You might try to re-glue the de-lam. Nothing lost if it doesn't hold. If you can work some epoxy all the way in at the de-lam, Super glue will not hold. I would try to stress the limb to open the crack and use a hacksaw blade (with the teeth ground off) to force the epoxy into the crack then clamp it. If you warm the epoxy it will flow better.

Good Luck

James

[Pago]

You can thin smooth on or other epoxy with 95% pure isopropyl but, no offense intended the layup looks sketchy to me.  Possibly too much or not enough pressure in that area on the layup.

[kennym]

I'm not seeing much damage to wood, so may be an adhesion prob. What kind of glue and what type of form (air or bands)?

[mikkekeswick]

Trouble is those surfaces have already had glue on them. All the pores are now filled, the bond would be poor at best if you just tried to get some glue in there and clamp it up again.
Something caused the glue to fail, the reasons are too many and varied for anyone to know from looking at those pictures.
Who wants a bow that is a ticking time bomb....!

[Krasus]

Fade looks like it has a square end rather then tapering to nothing

[Roy from Pa]

Yes it is square, good observation.

[Elison]

The wood don't broke when delaminate.
So, I tried to glues it again, thinning the epoxy with a heat gun to fill all the gaps.  
It seems to be ok in this part.  BUT, the limb delaminate in the tips too.  D=

Causes for bad epoxy.  

Let's see if this bow will turn a bow or a firewood.