Steam Bending Plywood
Well I tried to bend 6mm plywood around my buck (As described in a
previous thread), and after steaming it for almost an hour, got absolutely no where. As I can not find 2mm or 3mm okoume any where locally, and shipping it seems pretty prohibitive ($50.00 packaging fee for one sheet???!!).... I have found a source for 1.5mm Finnish Baltic Birch 3 ply (AirCraft Grade) in 4' x 4' sheets. The supplier says it can be rolled and shipped via ups in a mailing tube.... so I guess it can be made to conform to my buck. Anyone aware of any reasons not to "cold mold" several layers of baltic birch ply? It will be epoxy, four layers of 1.5mm baltic birch glued with epoxy (I am hopping that the epoxy in between the birch will fill out the sandwich a little for a 9mm width) and a layer of 6oz fibre glass on the outside..... I can however buy 4mm 3 ply bs1088 okoume locally, but am wary of being able to bend it after steaming to my desired radius. comments appreciated. Kevin |
Steam Bending Plywood
Brian,
The problem with that is... well straight glass just won't match well with the overall wood based theme of the boat. I want the nice grain and wood color in the inside... and showing through the wetted out glass on the outside. Kevin Brian Whatcott wrote in message . .. I'm sure the laminated birch ply will work for you, but then you could go the whole hog with cloth, chopped strand and cloth for a piece that will last rather longer than any wood can hope for... Wrap a shiny plastic film overall while setting, for that gloss finish you would like.... Brian W |
Steam Bending Plywood
Perhaps a sheet of 1.5 mm on the inside; and another on the outside..and
glass all the way through??? That way you get the wood appearance, and the glass strength and longevity. Your materials can be "mailed in a tube" too. RichG |
Steam Bending Plywood
Are you sure you can't get 3mm baltic birch ply locally?
It seems to be very popular for making drawer bottoms. Cheap and strong too. I think 3mm should be flexible enough to cold mould the way you want. "Kevin" wrote in message om... Well I tried to bend 6mm plywood around my buck (As described in a previous thread), and after steaming it for almost an hour, got absolutely no where. As I can not find 2mm or 3mm okoume any where locally, and shipping it seems pretty prohibitive ($50.00 packaging fee for one sheet???!!).... I have found a source for 1.5mm Finnish Baltic Birch 3 ply (AirCraft Grade) in 4' x 4' sheets. The supplier says it can be rolled and shipped via ups in a mailing tube.... so I guess it can be made to conform to my buck. Anyone aware of any reasons not to "cold mold" several layers of baltic birch ply? It will be epoxy, four layers of 1.5mm baltic birch glued with epoxy (I am hopping that the epoxy in between the birch will fill out the sandwich a little for a 9mm width) and a layer of 6oz fibre glass on the outside..... I can however buy 4mm 3 ply bs1088 okoume locally, but am wary of being able to bend it after steaming to my desired radius. comments appreciated. Kevin |
Steam Bending Plywood
The problem with the local 3mm baltic birch that I have been able to
find is that it only has interior grade glue.... which I don't think will hold up. Kevin "Trent Hink" wrote in message ... Are you sure you can't get 3mm baltic birch ply locally? It seems to be very popular for making drawer bottoms. Cheap and strong too. I think 3mm should be flexible enough to cold mould the way you want. |
Steam Bending Plywood
Yes standard Baltic (actually Russian) birch is not even slightly water
resistant. Kevin wrote: The problem with the local 3mm baltic birch that I have been able to find is that it only has interior grade glue.... which I don't think will hold up. Kevin "Trent Hink" wrote in message ... Are you sure you can't get 3mm baltic birch ply locally? It seems to be very popular for making drawer bottoms. Cheap and strong too. I think 3mm should be flexible enough to cold mould the way you want. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
Steam Bending Plywood
Glenn Ashmore wrote in message news:DDZGb.11259$JD6.7487@lakeread04...
Yes standard Baltic (actually Russian) birch is not even slightly water resistant. Sure is nice for making scale models though Scotty Kevin wrote: The problem with the local 3mm baltic birch that I have been able to find is that it only has interior grade glue.... which I don't think will hold up. Kevin "Trent Hink" wrote in message ... Are you sure you can't get 3mm baltic birch ply locally? It seems to be very popular for making drawer bottoms. Cheap and strong too. I think 3mm should be flexible enough to cold mould the way you want. |
Steam Bending Plywood
It seems to hold up very well for these:
http://gallery.kiteforum.com/gallery/albup46 But I always thoroughly coat it with epoxy and sometimes vacuum bag a layer of glass on as well. Note the tortured shape, from 3 layers 3mm laminated with rocker and bottom concave. Nice springy "pop" like a snowboard. At 180lbs with frequent jumps to around 15', I haven't been able to break one or seen any signs of rot yet, even the ones where I ground through to to bare wood riding over sand and (sometimes) rocks. Then again this is not an application where the wood is submerged for much more than a few hours at a time. "Glenn Ashmore" wrote in message news:DDZGb.11259$JD6.7487@lakeread04... Yes standard Baltic (actually Russian) birch is not even slightly water resistant. Kevin wrote: The problem with the local 3mm baltic birch that I have been able to find is that it only has interior grade glue.... which I don't think will hold up. Kevin "Trent Hink" wrote in message ... Are you sure you can't get 3mm baltic birch ply locally? It seems to be very popular for making drawer bottoms. Cheap and strong too. I think 3mm should be flexible enough to cold mould the way you want. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
Steam Bending Plywood
Did so more searching and found sources localy for:
1- 3 Ply 3mm (1/8 inch) Italian Poplar called Bending Poplar 2- 3 Ply 2.7 mm meranti VC (What does the VC mean?) 3- 2 Ply 2.7 mm meranti 4- 3 Ply 2.7 mm meranti A-3 VC (I assume this is grading information... somoene want to decode it for me?) 5- 3 Ply 3mm Obeche Which would be my best option for my rounded driftboat transom, and what are the various strenghts and weaknesses of the above listed woods? Thanks in advance, Kevin |
Steam Bending Plywood
Just got back from the supplier on the above mentioned ply and
discovered that it was all exterior glue.... looks like I will most likely ored in the 1.5 mm finnish birch from an aircraft supply co. It is rated finnish grade gl-11 anyone know if this is water proof? Kevin |
Steam Bending Plywood
make that finnish grade gl-2 on my previos post.
Kevin |
Steam Bending Plywood
Aircraft rated ply is one step beyond marine rated: specifically, it
must have no voids and no patches in any ply, and be waterproof glue laminated. Brian W On 29 Dec 2003 11:05:49 -0800, (Kevin) wrote: Just got back from the supplier on the above mentioned ply and discovered that it was all exterior glue.... looks like I will most likely ored in the 1.5 mm finnish birch from an aircraft supply co. It is rated finnish grade gl-11 anyone know if this is water proof? Kevin |
Steam Bending Plywood
My brain must not be fully in gear today.....
the problem with the long list of ply that I found is that it was all interior grade glue... not exterior as I stated above (guess the mental clutch is slipping). So now I think I will either do a layer of 1.5mm gl-2 finnish birch followed by 6mm of chopped glass and resin, topped by another 1.5mm birch ply (for 9mm of material) or 4 layers of the birch sandwiched out with glass & epoxy to the desired 9mm. Which of the above techniques will be stronger? The birch is sold in 4'x4' sheets at around $24.00 a sheet plus shipping (about $10.00). I am trying to also decide which will be more cost effective as I haven't decided wich is more expensive, an extra sheet of birch or the epoxy and glass needed to build a 6mm inner core. Any thoughts on which technique is more cost effective? As for bending: I will soak the birch in a very hot bath, throw in some amonia (into the hot bath), and spot spray with water & heat it with a flat iron as needed while applying it (a technique I saw described in one of the model airplane building groups where the guy said he wrapped 6 inches 1.5mm around a pencil, in a very tight spiral). Thanks, Kevin |
Steam Bending Plywood
Beam strength in bending is determined by the strength of the layers
in the outside quarters. Glass will be cheaper stronger and more durable than the ply. It's heavier too..... If you use use ammonia, the heat and flat iron won't be necessary. Brian W On 29 Dec 2003 19:45:58 -0800, (Kevin) wrote: My brain must not be fully in gear today..... the problem with the long list of ply that I found is that it was all interior grade glue... not exterior as I stated above (guess the mental clutch is slipping). So now I think I will either do a layer of 1.5mm gl-2 finnish birch followed by 6mm of chopped glass and resin, topped by another 1.5mm birch ply (for 9mm of material) or 4 layers of the birch sandwiched out with glass & epoxy to the desired 9mm. Which of the above techniques will be stronger? The birch is sold in 4'x4' sheets at around $24.00 a sheet plus shipping (about $10.00). I am trying to also decide which will be more cost effective as I haven't decided wich is more expensive, an extra sheet of birch or the epoxy and glass needed to build a 6mm inner core. Any thoughts on which technique is more cost effective? As for bending: I will soak the birch in a very hot bath, throw in some amonia (into the hot bath), and spot spray with water & heat it with a flat iron as needed while applying it (a technique I saw described in one of the model airplane building groups where the guy said he wrapped 6 inches 1.5mm around a pencil, in a very tight spiral). Thanks, Kevin |
Steam Bending Plywood
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Steam Bending Plywood
Well.......
I bent and glued in the first layer of the 1.5mm finnish birch. Didn't even have to steam it, just bent it around my buck. Today I am going to do a couple layers of chopped glass mat, and maybe the outer skin. I did test a chunk of the birch, submersing it in hot water. VERY flexible, I bent it to about a 2 inch radius. Cut the birch to shape using a utility knife. Was afraid that a saw would have ripped it to pieces. Kevin |
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