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Backing for Tri-laminate ELB

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Del the cat:

--- Quote from: Redhawke on January 25, 2019, 08:07:34 am ---Del the cat, it makes perfect sense sir. I want a finished length of 75" so start at 77" and work from that point. I suppose my real question is what thickness should the Yellowheart core lam start at and the end of it be tapered to for finish (or a rough guess)? The Ipe can be added to the equation to meet depth requirements and meet the 100-120 lbs draw weight. I totally agree that mm are easier to work with in many instances. I build cigar box guitars and use mm almost exclusively on those builds.

--- End quote ---
Depends on what thicknesses of wood you have available... but...
If it was me I'd make the core a linear taper from about 12mm to 3mm (or maybe 13 - 3) that seems to be manageable dimensions that will still leave plenty of belly wood to tiller. :)
I reckon on a roughing out taper of between 1.6mm every 6" to 2mm every 6"

Maybe if you taper the core from a little bit thicker (say 14mm) that would allow you to flatten/blend the centre to a flatter, more gentle curve where the two tapers meet, that will make it easier to glue on the belly lam.
Hope that's some help.
Del

Redhawke:
Del the cat, it helps tremendously. If all goes well I will try to get the lumber ripped into dimension this afternoon. I'm a bit anxious to see how my Freud thin kerf ripping blade fairs on the Ipe and Yellowheart. If all goes well my next step will be to build a tapering jig for the core laminate but that will be a day off project. Thanks so very much Del the cat and all you guys for helping me with this project. I'm unsure if I'm equal to this task and if it were not for such a very special young man I wouldn't even consider trying to build it. I will do my best to add pictures as I go along with the build and I'm sure there will be lots more questions coming from me soon. Many thanks.

Redhawke:
Del the cat getting close to glue up time for this bow. Do you think I should make a former and add a bit of reflex on this build ? If so how much should I go for and is there a tutorial here for building one ? Thanks again sir, all the help here has been a tremendous help.

Del the cat:
Personally I wouldn't add reflex to a heavy long draw bow as they are a pig to get to brace anyway, and reflex will make it want to flip on the tiller. If you really want to, then I'd say no more than an inch.
Del

Redhawke:
That makes sense to me sir and I will not do it. Thanks again.

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