Toasting belly question

[Keith Wolfe]

I glued up a hickory backing strip on a hickory pecan bow with tb3. Was wondering if toasting the belly once tillered would weaken the glue since tb is heat sensitive. Belly is a little over a quarter to 3/8" thick. thanks!!!!!

[Pat B]

All Tite Bond glue will release at 150 degrees. You might be able to do a light toasting but I doubt it will help. Did you add reflex at glue-up?

[BMorv]

X2 on Pat.  150 degrees isn't all that much.  That's not even close to heat treat temperatures. 
TB3 is the least heat tolerant of the common bow building glues.  A few seconds with the heat gun and it will start to melt/release. 

That has it's positives and negatives.  It's nice when you can use a heat gun to remove a damaged backing...

 
 

[Pat B]

I found out about the heat release when I called TB tech support to find out how to remove a rotten hickory backing and the tech guy told me about the 150 deg. Like BMorv, it worked like a champ.

[Roy from Pa]

There have been times when I wished unibond800 was that easy:)

[Pat B]

He could probably toast the belly had he used Unibond.

[Wolftrail]

X2 on Pat.  150 degrees isn't all that much.  That's not even close to heat treat temperatures. 
TB3 is the least heat tolerant of the common bow building glues.  A few seconds with the heat gun and it will start to melt/release. 

That has it's positives and negatives.  It's nice when you can use a heat gun to remove a damaged backing...

I have never heat treated a bow made with TB3.. But, but and I will repeat I have heated the last 6-10" of the tips to straighten out the limb and never had any problems, I applied enough heat to gently twist the limb so I was not going wimpy using the heat...

[Keith Wolfe]

I figured it was going to be a bad idea. I think ill thin the backing from 3/16 to an eighth, leave the belly relatively rectangular with rounded edges, and trap the corners on the back. I'm just still gun shy from a belly failure i probably crowned too much while not trapping back or backing with anything so i was entertaining the idea of strengthening the belly a little. How much do y'all come in when you trap the back? Like an eighth from the corner or so???? Thank you. Just being paranoid.

[Wolftrail]

I figured it was going to be a bad idea. I think ill thin the backing from 3/16 to an eighth, leave the belly relatively rectangular with rounded edges, and trap the corners on the back. I'm just still gun shy from a belly failure i probably crowned too much while not trapping back or backing with anything so i was entertaining the idea of strengthening the belly a little. How much do y'all come in when you trap the back? Like an eighth from the corner or so???? Thank you. Just being paranoid.

"How much do y'all come in when you trap the back?"  I have gone at least 3/16"  maybe 1/4".

[Pat B]

I think it would depend on the situation. Wood is stronger in tension than it is in compression and different woods have different values for both tension and compression. I think basically 1/32" to 1/8" from each side depending on the wood used or the wood(boo) combo used.