Hi... The PBS series was wonderful! Really a neat project. Wish I d been involved! My boat is built,. and I m on to another project. I intend to bend seatsMessage 1 of 4 , Feb 8View SourceHi...
The PBS series was wonderful! Really a neat project. Wish I'd been involved!
My boat is built,. and I'm on to another project. I intend to bend seats to form stool tops. Here's a link to what I intend to make:http://www.finewoodworking.com/item/105788/cantilevered-bar-stool
I intend to make the top out of 1/16" sheets laminated to the shape that's shown. My questions are...
1) What should I make the form out of? It needs to be the width of the seat, I presume
2) I intend to do a combination of steam and laminate. I'll make the steam box big enough it will take the full width and length of the seat, and probably big enough for 3 opr 4 sheets at a time. How long would you steam a 1/16" sheet
3) The legs will be out of cherry (probably cut to 1/8" thick, then laminated. Does cherry bend okay?
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From: "george" <kf2oc@...>
Date: 02/08/2013 12:12 PM
Subject: [Airolite_Boats] Re: Steam bending, strength and wood choice
Sent by: Airolite_Boats@yahoogroups.com
Please pardon this follow-up, re: my earlier posting about chariot building. PBS has since rebroadcast this one hour program several times over local digital TV here, and they advertize it as being available on their website. Perhaps handier, is to search on Building Pharaoh's Chariot and you will get a list of good sources including on-line video, and most likely including some links related to your local PBS TV sources. I am a fan of this particular program because it has ANCIENT EVOLVED WOOD DESIGN (showing simple but effective evolved features), HORSES ON THE RUN WITH CHARIOT ACTION, SOME ARCHERY, SOME CLASH BETWWEEN THE ARTIST AND ENGINEER IN INTREPRETING THE ANCIENT RECORDS, and PLENTY OF STEAM BENDING IN BOTH OLD AND NEW STYLES. For me, that is a wonderful mix of topics, and who couldn't like seeing a chariot design from a milenia b.c. running with pharamids in the background. Thay also talked about their wood sourcing problems. glb
--- In Airolite_Boats@yahoogroups.com, "george" wrote:
>PBS feature broadcast about chariot building. They built and tested two versions based on designs from about 1500 b.c.. These were based on tomb sketches and from some museum holdings. They were built with quite a bit of springyness that had evolved in the design over several design generations. They took craftmen that are currently practicing bent wood furniture making every day, and gave brief views of their steaming and bending jigs in action. They also showed the jigs and bending of the parts for the chariots. They were tested on various terrains with two different pairs of horses. Some with an archer on-board as well as the teamster. It was a very successful 'war machine'. On one of the test runs a radar gun showed them doing 24 MPH.
> On this subject of steam bending, wondering if anyone saw this evenings
>Did not find it difficult. But not finding need for bending in my current work on the PS Catamaran. In fact, have so-far designed to avoid the need for two dimensional bending of the cover sheeting, thus reducing any wrinkle problems or for the use of heat shrinking of the coverings. Cheers, George.
> I have previous experience in the bending of oak direct from the saw-mill.
>Airolite_Boats@yahoogroups.com, John Capwell wrote:
> --- In
> >me concern. Steam bending wood takes time but if done properly it will result in the desired shape and best results for the water craft. Wood choice and technique will create a shape and strength necessary for success.
> > Reading the comments on wood for stems and cross sections causes
> >but I have access to a good supply. If ash is not available check the density of available species so that you do not add unnecessary weight to the final craft. Where strength is required, rip the wood into strips so that you can laminate the bent strips. Steam bend the strips and laminate them after they have dried.
> > Hardwoods are the best for steam bending. My preference is ash
> >the heat that breaks the ligands in the cellulose. Breaking those ligands is essential to creating the hull shapes, especially for the shapes at the stems of the boat. Soaking does not break the ligands, it only softens the cellulose.
> > Steam bending is necessary as opposed to soaking strips. It is
> >a constant source of steam. Check some of the designs on the web. There are a number of great variations that work well. Make sure you steam your wood for an hour per each 2.5cm.(1 inch) per hour. Remove the wood strip, using gloves, and bend it immediately to the desired shape. Then immediately remove the strip from the form and reverse the bend in the opposite direction. By reversing the bend in the wood all of the ligands are broken and the wood does not spring out of the desired shape.
> > Build a steam box or use a plastic pipe which is adapted to accept
> > Sent from my iPad