adventures in plywood

Anything that doesn't fit into the other Physical Systems categories

adventures in plywood

Postby lewharve » Thu Sep 22, 2016 5:30 pm

We got our boat cheap because it needed work.
One of the project is building the port side interior . our plan was to have two benches and a cabinet.
We built the cabinet following the contour of the boat. Now we want to build the be nch and have it match the starboard. The plywood on the bench is bent at a 90 degree on a 16 inch dia. I thought that we could cut kirks on the cherry plywood. But people said no. they say when the boat was built the plywood was built or laid up with the curve
One guy says to use flexible plywood with a veneer. We got some and we will try to bend it tomorrow
If anyone has a better way to do it. Let me know
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm

Re: adventures in plywood

Postby jdpandlp » Thu Sep 22, 2016 8:54 pm

Making a smooth radius for what I am assuming is the front vertical for the bench is not difficult but it is tedious. First the form needs to be built. Then multiple layers glued up over the form. The last bench I built with this method I alternated 1/64 and 1/32 layers glued up with West to get a 1/2 thickness. The finish veneer was then applied after it had cured. Like I said, tedious, but the finished product will come smooth to the eye and touch and be very strong.

Pete
jdpandlp
 
Posts: 57
Joined: Mon Dec 08, 2008 8:59 am

Re: adventures in plywood

Postby lewharve » Fri Sep 23, 2016 12:08 pm

what is the cost and how much time. I don't have much time as I have to get the lazy jacks, every one I talked to including professionals in the commercial wood shop says lay my own. Still with the amount of money we have I think we wait to lay up our benches. I think I will try some flexible plywood and then cut kirts even if we see the lines it will have to do until we find a place to work and dock for a while.
right now I want to go and I have the Lazy jacks to figure out.
thanks I will post when I am ready to start the layups
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm

Re: adventures in plywood

Postby andygc » Sat Sep 24, 2016 6:48 am

Cutting saw kerfs in the back of sheet material like plywood is a well-established technique for bending it. The closer the kerfs are to each other, the smoother the curve and the smaller the radius you can achieve. The kerfs must be all the same depth (not quite reaching the face veneer), equally spaced and exactly parallel. There's plenty of stuff on the internet - try searching for "bending plywood with kerf cuts".

The curve needs to be round a rigid frame - I don't know if you are describing a rolled edge on your bench, or a curve in a vertical panel - but either way you need shaped frames to control and support the curve. Once the curved sheet is glued into place on the frame you can fill the kerfs with thickened epoxy to increase stiffness.

You could have a practice run with cheap plywood rather than your cherry-faced ply.

Of course laminating is a better method, but laminating is time-consuming and an easy way to get into a mess if you haven't been shown how to do it.
Feronia
(UK Freedom 30 cat ketch, build number 107)
River Exe, Devon
andygc
 
Posts: 60
Joined: Sun Jul 31, 2016 4:33 pm

Re: adventures in plywood

Postby lewharve » Sat Sep 24, 2016 8:54 pm

I am making the curve slowly it flexible plywood I'll let you know
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm

Re: adventures in plywood

Postby lewharve » Mon Sep 26, 2016 12:05 pm

DSCN1526.JPG
flexable plywood after 4 days of creeping.
DSCN1526.JPG (127.35 KiB) Viewed 2154 times

I plan to build a structure of the corner and back the flexible ply wood with 1/2 plywood. we will see
Attachments
DSCN1519.JPG
DSCN1519.JPG (127.67 KiB) Viewed 2154 times
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm

Re: adventures in plywood

Postby lewharve » Tue Sep 27, 2016 9:41 pm

it is coming along
Attachments
DSCN1530.JPG
how I did this
DSCN1530.JPG (128.56 KiB) Viewed 2124 times
DSCN1529.JPG
it takes shape
DSCN1529.JPG (128.42 KiB) Viewed 2124 times
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm

Re: adventures in plywood

Postby lewharve » Sun Oct 02, 2016 3:46 pm

it is raining right so no veneer the foam is on order but this is it. it sort of looks factory but not spectacular for all the work
Attachments
DSCN1548.JPG
DSCN1548.JPG (126.96 KiB) Viewed 2104 times
DSCN1547.JPG
DSCN1547.JPG (127.81 KiB) Viewed 2104 times
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm

Re: adventures in plywood

Postby tnltracy » Tue Oct 04, 2016 12:09 pm

Looking good! Surely better than it would look if it was me doing it!
1984 Freedom 32 #28
Warwick Cove, Greenwich Bay, RI
tnltracy
 
Posts: 117
Joined: Fri Oct 10, 2014 10:45 pm

Re: adventures in plywood

Postby lewharve » Tue Oct 04, 2016 8:53 pm

Flexible ply wood
lewharve
 
Posts: 86
Joined: Sun May 12, 2013 7:59 pm


Return to Everything Else

Who is online

Users browsing this forum: No registered users and 3 guests