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+-- Thread: Butt-Joint Glue UpSuggestions (/showthread.php?tid=7330029)
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RE: Butt-Joint Glue UpSuggestions - Steve N - 05-06-2017
(05-06-2017, 12:26 PM)Don_M Wrote: Thanks
The only issue there is that once I force the skirt board into a curve to fit around the stair case -I think there will be some stress (tension) on the end joint.
I suppose a scarf joint is probably the classic solution – but I think the backer scrap (with perhaps a lap) will be a good way to go for me.
It would sure give you something solid to attach to.
RE: Butt-Joint Glue UpSuggestions - JGrout - 05-07-2017
long scarf joints
RE: Butt-Joint Glue UpSuggestions - Steve N - 05-07-2017
3/8" thick ply of any kind, cutting scarfs would unearth a lot of partial ply, I'm thinking that may not be so stable, especially wrapped on a curve. It wouldn't be my first choice, but I can't see it working in my minds eye. If it actually worked, well there ya go
RE: Butt-Joint Glue UpSuggestions - JGrout - 05-07-2017
Last one I helped with we just butted the wiggle wood together and let the veneers hold it together
the difference was that we used vacuum bags to veneer using a frame to set the spiral
I also think you are looking at the scarf differently , I just rip the stock long (as in a couple of feet) then attach with glue)
RE: Butt-Joint Glue UpSuggestions - Alan S - 05-07-2017
(05-07-2017, 12:15 PM)Steve N Wrote: 3/8" thick ply of any kind, cutting scarfs would unearth a lot of partial ply, I'm thinking that may not be so stable, especially wrapped on a curve.
The link I provided earlier in this thread described scarfing 1/4" ply for bending into a kayak.
RE: Butt-Joint Glue UpSuggestions - mike4244 - 05-07-2017
Don, I have used " wiggle board" the stuff that comes from Australia often. You can easily bend a 12" radius let alone a large radius like you need. You do not need anything but a simple butt joint. Are you veneering over the wiggle board?
mike
RE: Butt-Joint Glue UpSuggestions - Cooler - 05-08-2017
I've joined plywood (3/4") by making a large half-lap joint. Essentially it is more a continuation of the plywood than a real joint. As I recall I made a 6" lap on both pieces and glued and clamped. A longer lap will make a stronger joint, at some point it is going to be as strong as the plywood itself. I have no idea how to calculate the required length. It probably is going to be seat-of-the-pants engineering.