Re: [bolger] Re: PLYWOOD LAMINATE BISCUIT JOINTS
John:
I saw this posting late. The bisciuts are made from compressed beech wood and are designed to expand when used with water based glues. This gives them a tight fit as water is soaked up during the curing process. I use the water proof carpenters glues. If you do not use a water based glue the bisciuts never expand leaving a void. If you are using them to just hold joints in line for glassing, great. If you are asking more of them in the form of strengh it wont happen. Best deal is to use water based glue with bisciuts, let it dry, then fiberglass it, without the chance of trapping water. Then you have the best of both worlds.
Chance
"Peter Lenihan <ellengaest@...>" <ellengaest@...> wrote:John,
Yes,I have used biscuits to hold two plwood sheets together just
prior to going at them with the "Payson joint". The idea for me was
to use the biscuits to hold the entire 8' foot butt in perfect
alignment while allowing for some hollowing or dishing of the joint
to recieve the fiberglass tape.
The big advantage is that you do not have to tack any part of the
plywood down along that seam and believe me,on an eight foot
seam,outside under the sun,getting the two edges to lay perfectly
against each other will drive you nuts,without biscuits!
I have only joined four groups of two 4 X 8 X 1/2" ply panels(all
the major bulkheads) but this took all less then 30 minutes.I plan on
using the "cookies" this spring when assembling the two hull-cabin
sides each comprised of eight 4 X 8 panels for my Windermere
As to the question of increased strength;I suspect that
practically speaking the butt joint remains the weakest method to
hold two pieces together with the biscuits making little
difference,unless you instead go for a full length
spline.The "Payson" joint is very strong due to the presence of two
layers of 10oz.glass tape working in tension/compression.
You can click here to see a photo of two bulkheads successfully
joined with biscuits...........not great detail but these began life
as an 8' X 8' X 1/2" plywood panel and are immensely strong!
http://groups.yahoo.com/group/Bolger2/files/WINDERMERE%20Construction%
20photos/boat1009.jpg
If the whole link does not work,it is over on
Bolger2,files,WINDERMERE,picture"boat 1009.jpg
Hope this helps and inspires you John :-)
Sincerely,
Peter Lenihan.............
--- In bolger@yahoogroups.com, "John Cupp <caj@k...>" <caj@k...>
wrote:
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- add your comments at the TOP and SIGN your posts and <snip> away
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
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[Non-text portions of this message have been removed]
I saw this posting late. The bisciuts are made from compressed beech wood and are designed to expand when used with water based glues. This gives them a tight fit as water is soaked up during the curing process. I use the water proof carpenters glues. If you do not use a water based glue the bisciuts never expand leaving a void. If you are using them to just hold joints in line for glassing, great. If you are asking more of them in the form of strengh it wont happen. Best deal is to use water based glue with bisciuts, let it dry, then fiberglass it, without the chance of trapping water. Then you have the best of both worlds.
Chance
"Peter Lenihan <ellengaest@...>" <ellengaest@...> wrote:John,
Yes,I have used biscuits to hold two plwood sheets together just
prior to going at them with the "Payson joint". The idea for me was
to use the biscuits to hold the entire 8' foot butt in perfect
alignment while allowing for some hollowing or dishing of the joint
to recieve the fiberglass tape.
The big advantage is that you do not have to tack any part of the
plywood down along that seam and believe me,on an eight foot
seam,outside under the sun,getting the two edges to lay perfectly
against each other will drive you nuts,without biscuits!
I have only joined four groups of two 4 X 8 X 1/2" ply panels(all
the major bulkheads) but this took all less then 30 minutes.I plan on
using the "cookies" this spring when assembling the two hull-cabin
sides each comprised of eight 4 X 8 panels for my Windermere
As to the question of increased strength;I suspect that
practically speaking the butt joint remains the weakest method to
hold two pieces together with the biscuits making little
difference,unless you instead go for a full length
spline.The "Payson" joint is very strong due to the presence of two
layers of 10oz.glass tape working in tension/compression.
You can click here to see a photo of two bulkheads successfully
joined with biscuits...........not great detail but these began life
as an 8' X 8' X 1/2" plywood panel and are immensely strong!
http://groups.yahoo.com/group/Bolger2/files/WINDERMERE%20Construction%
20photos/boat1009.jpg
If the whole link does not work,it is over on
Bolger2,files,WINDERMERE,picture"boat 1009.jpg
Hope this helps and inspires you John :-)
Sincerely,
Peter Lenihan.............
--- In bolger@yahoogroups.com, "John Cupp <caj@k...>" <caj@k...>
wrote:
> Has anyone tried to use Biscuits while butting together plywoodBolger rules!!!
> sheets with epoxy and glass cloth? I have used biscuits on solid
> woods to make laminated table tops but I have never thought to use
> them on a plywood joint. It seems it might make the joint stronger
> if liberal epoxy were used on the biscuits also the use the same
> technique with the fiberglass. Any opinions?
>
> John
- no cursing, flaming, trolling, spamming, or flogging dead horses
- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
- add your comments at the TOP and SIGN your posts and <snip> away
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
- Unsubscribe: bolger-unsubscribe@yahoogroups.com
- Open discussion: bolger_coffee_lounge-subscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
---------------------------------
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now
[Non-text portions of this message have been removed]
John,
Yes,I have used biscuits to hold two plwood sheets together just
prior to going at them with the "Payson joint". The idea for me was
to use the biscuits to hold the entire 8' foot butt in perfect
alignment while allowing for some hollowing or dishing of the joint
to recieve the fiberglass tape.
The big advantage is that you do not have to tack any part of the
plywood down along that seam and believe me,on an eight foot
seam,outside under the sun,getting the two edges to lay perfectly
against each other will drive you nuts,without biscuits!
I have only joined four groups of two 4 X 8 X 1/2" ply panels(all
the major bulkheads) but this took all less then 30 minutes.I plan on
using the "cookies" this spring when assembling the two hull-cabin
sides each comprised of eight 4 X 8 panels for my Windermere
As to the question of increased strength;I suspect that
practically speaking the butt joint remains the weakest method to
hold two pieces together with the biscuits making little
difference,unless you instead go for a full length
spline.The "Payson" joint is very strong due to the presence of two
layers of 10oz.glass tape working in tension/compression.
You can click here to see a photo of two bulkheads successfully
joined with biscuits...........not great detail but these began life
as an 8' X 8' X 1/2" plywood panel and are immensely strong!
http://groups.yahoo.com/group/Bolger2/files/WINDERMERE%20Construction%
20photos/boat1009.jpg
If the whole link does not work,it is over on
Bolger2,files,WINDERMERE,picture"boat 1009.jpg
Hope this helps and inspires you John :-)
Sincerely,
Peter Lenihan.............
--- In bolger@yahoogroups.com, "John Cupp <caj@k...>" <caj@k...>
wrote:
Yes,I have used biscuits to hold two plwood sheets together just
prior to going at them with the "Payson joint". The idea for me was
to use the biscuits to hold the entire 8' foot butt in perfect
alignment while allowing for some hollowing or dishing of the joint
to recieve the fiberglass tape.
The big advantage is that you do not have to tack any part of the
plywood down along that seam and believe me,on an eight foot
seam,outside under the sun,getting the two edges to lay perfectly
against each other will drive you nuts,without biscuits!
I have only joined four groups of two 4 X 8 X 1/2" ply panels(all
the major bulkheads) but this took all less then 30 minutes.I plan on
using the "cookies" this spring when assembling the two hull-cabin
sides each comprised of eight 4 X 8 panels for my Windermere
As to the question of increased strength;I suspect that
practically speaking the butt joint remains the weakest method to
hold two pieces together with the biscuits making little
difference,unless you instead go for a full length
spline.The "Payson" joint is very strong due to the presence of two
layers of 10oz.glass tape working in tension/compression.
You can click here to see a photo of two bulkheads successfully
joined with biscuits...........not great detail but these began life
as an 8' X 8' X 1/2" plywood panel and are immensely strong!
http://groups.yahoo.com/group/Bolger2/files/WINDERMERE%20Construction%
20photos/boat1009.jpg
If the whole link does not work,it is over on
Bolger2,files,WINDERMERE,picture"boat 1009.jpg
Hope this helps and inspires you John :-)
Sincerely,
Peter Lenihan.............
--- In bolger@yahoogroups.com, "John Cupp <caj@k...>" <caj@k...>
wrote:
> Has anyone tried to use Biscuits while butting together plywood
> sheets with epoxy and glass cloth? I have used biscuits on solid
> woods to make laminated table tops but I have never thought to use
> them on a plywood joint. It seems it might make the joint stronger
> if liberal epoxy were used on the biscuits also the use the same
> technique with the fiberglass. Any opinions?
>
> John
Has anyone tried to use Biscuits while butting together plywood
sheets with epoxy and glass cloth? I have used biscuits on solid
woods to make laminated table tops but I have never thought to use
them on a plywood joint. It seems it might make the joint stronger
if liberal epoxy were used on the biscuits also the use the same
technique with the fiberglass. Any opinions?
John
sheets with epoxy and glass cloth? I have used biscuits on solid
woods to make laminated table tops but I have never thought to use
them on a plywood joint. It seems it might make the joint stronger
if liberal epoxy were used on the biscuits also the use the same
technique with the fiberglass. Any opinions?
John