Author Topic: Gluing in deflex - not the result I was expecting!  (Read 338 times)

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Offline Aussie Yeoman

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Gluing in deflex - not the result I was expecting!
« on: April 28, 2025, 08:03:16 am »
I'm shelving the plans to experiment with my other idea (http://www.primitivearcher.com/smf/index.php/topic,73157.0.html) to induce deflex, and have instead started to play around with just gluing it in with multiple layers.

In the past when I've glued in reflex, I found that the out-of-the-form reflex was about half, give or take, of the reflex in the form. So, thinking that's what would happen here, I deliberately made a form with twice the intended deflex for glue up, thinking it would spring back a fair bit out of the form.

Nope.

It kept nearly all of it! I guess that's what happens when you use lams of even thickness, instead of a thin boo backing with a relatively thicker stave.

I was originally going to make just a D/R bow, but given just how much deflex there is (about 4"), I'm thinking of adding some recurves too, which would mean needing less reflex.

The timber here is ironbark on either side of a maple accent strip.

Articles for the beginning bowyer, with Australian bowyers in mind:

http://www.tharwavalleyforge.com/articles/tutorials

Offline Selfbowman

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Re: Gluing in deflex - not the result I was expecting!
« Reply #1 on: April 28, 2025, 07:15:32 pm »
Here is a computer design AVCase did and I built. It’s a good one.
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Gluing in deflex - not the result I was expecting!
« Reply #2 on: April 28, 2025, 07:17:56 pm »
The design that you have done is a great glass bow design. May work out fine.
Well I'll say!!  Osage is king!!

Offline Aussie Yeoman

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Re: Gluing in deflex - not the result I was expecting!
« Reply #3 on: April 28, 2025, 07:32:24 pm »
Oh yeah for sure - I'm confident I can make a bow from it. Just wasn't what I'd intended.
Articles for the beginning bowyer, with Australian bowyers in mind:

http://www.tharwavalleyforge.com/articles/tutorials

Offline Hamish

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Re: Gluing in deflex - not the result I was expecting!
« Reply #4 on: April 28, 2025, 09:15:18 pm »
Very interesting. Looking forward to seeing how it turns out. What timbers are you using?

Offline Aussie Yeoman

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Re: Gluing in deflex - not the result I was expecting!
« Reply #5 on: April 29, 2025, 04:59:52 am »
Ironbark on either side of a shim of maple.
Articles for the beginning bowyer, with Australian bowyers in mind:

http://www.tharwavalleyforge.com/articles/tutorials