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Coopered Lid and Strap Bending

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Blog entry by Lenny posted 11-07-2014 01:09 AM 1740 reads 1 time favorited 10 comments Add to Favorites Watch

Today I posted a finished keepsake trunk project: “Keepsake Trunk”: http://lumberjocks.com/projects/107694

This blog is to provide more information and photos of the wood used for the project, the process of making the curved lid (coopering) and also the process of pipe bending the straps. In early 2011 I saw an ad on Craigslist for some VERY old chestnut boards. How old? How about 1799 old! To make this story as short as possible, I ended up buying 19 good sized boards that had been floorboards in a house built in 1799. The seller assured me it was chestnut when I commented that it looked a lot like oak. He was part of the crew that tore down the house. He showed me a picture of the house and also a marker reading 1799 that came from a corner of the house. I later learned that it was/is in fact red oak, but not before I had begun making the trunk. The boards I bought were all pretty long…some up to 16 feet. Here is a photo of the gem board. It is about 19inches wide:

Here’s a narrower board I had cut into, showing both sides:


Most had finish and maybe some stain applied and a few were painted (perhaps for a closet?). The boards were filled with cut nails with smaller pieces of metal imbedded. I bought a metal detector to assure removal of all metal. Still, the finish took a toll on my planer knives. I resorted to using my belt sander with a 50 grit sanding belt to remove the majority of the finish and surface grit and then went to the planer. Some boards varied greatly in thickness from end to end. The board(s) used for the box sides ended up too narrow to yield ¾” thickness so I went to 5/8”.

The coopered lid is the featured part of this trunk and the most intriguing aspect to make. The trunk was designed by Garrett Glaser for American Woodworker magazine (Issue #149, Aug./Sept. 2010). Glaser provides the angles at which the individual staves are ripped. There are just two angles, 82.2 degrees and the sharper angle at the front and back of the lid which is 68.4 degrees. When all the staves are cut and set side to side, you apply tape across the top side to hold them together, flip them over to apply glue in the seams and then click, click, click the staves form an arc. You apply tape from one side to the other to hold the unit in place while the glue sets. Here are some photos of the process:



A few other processes take place next. You rout a lip for the lid end caps and cut the finger joints for the end caps. Then you use a block plane to gradually knock down the sharp edges until you have a relatively smooth curve. I followed that up with some sanding.

The only other tricky aspect of the project was bending the “straps” for the lid. The author recommended hot pipe bending but I decided to try steam bending. I had the majority of items needed to make a PVC steam “box”. I purchased what I didn’t have and made one. Long story short, I did not have any success and I am not certain why. I have my theories but I’m not sure. So, I went to Glaser’s plan A and made the jig necessary to hold the propane burner inside the galvanized pipe.


You soak the wood in water overnight. You light the burner and let the pipe reach a good level of heat. It takes a certain touch and I ruined a few pieces before getting it right. Glaser used meranti (aka, Phillipine mahogany, aka luaun) for the straps. A friend gave me a piece for the project but I was unable to get it supple enough to bend; it kept cracking. I resawed some walnut, making extra pieces, and eventually got the hang of the bending technique. You bend a little test the fit, bend some more, test some more until it’s just right.

I’ll be happy to answer any questions. Thanks and be safe in the shop!

-- On the eighth day God was back in His woodworking shop! Lenny, East Providence, RI



10 comments so far

View blackcherry's profile

blackcherry

3313 posts in 3285 days


#1 posted 11-07-2014 01:18 AM

Fun project my friend, really like the burner jig well made very cool !

View grizzman's profile

grizzman

7796 posts in 2765 days


#2 posted 11-07-2014 01:18 AM

thanks so much lenny, when i get to my project i will contact you if i have any questions…doing work like this is sure fun, i love a new challenge…..

-- GRIZZMAN ...[''''']

View Lenny's profile (online now)

Lenny

1488 posts in 2989 days


#3 posted 11-07-2014 01:21 AM

Thanks again Wilson. Feel free to do so Grizz.

-- On the eighth day God was back in His woodworking shop! Lenny, East Providence, RI

View TopamaxSurvivor's profile

TopamaxSurvivor

17664 posts in 3138 days


#4 posted 11-07-2014 02:20 AM

Nice blog Lenny. Thanks for the tips ;-)

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View tntro's profile

tntro

73 posts in 1024 days


#5 posted 11-07-2014 02:25 AM

Very nice looks like you done a great job

-- dale

View Rick  Dennington's profile

Rick Dennington

5175 posts in 2656 days


#6 posted 11-07-2014 07:31 PM

Great job on the trunk, Lenny….It takes a special person to be able to do that….I really like the idea, but it scares me to think of it..lol…..You’re a good craftsman, and I always enjoy seeing your projects….By the way, I like your new ( I guess not so new now) shop…...You do some beautiful work in there…..

-- At my age, an "all--nighter" is not having to get up and pee...!!!

View Lenny's profile (online now)

Lenny

1488 posts in 2989 days


#7 posted 11-07-2014 08:23 PM

Thank you Bob, Dale and Rick. Thanks for your kind words Rick. It’s funny because my take is…if I can do it, anyone can! Thanks also regarding the shop. I am quite happy out there and consider it my little slice of heaven.

-- On the eighth day God was back in His woodworking shop! Lenny, East Providence, RI

View Rick  Dennington's profile

Rick Dennington

5175 posts in 2656 days


#8 posted 11-07-2014 08:35 PM

You’re quite welcome, Lenny….And yes sir, we all have a little slice of heaven when we’re in the shop…..

-- At my age, an "all--nighter" is not having to get up and pee...!!!

View Roger's profile

Roger

19867 posts in 2266 days


#9 posted 11-08-2014 01:04 AM

Incredible Lenny. Thnx for taking the time to show all this. A very cool story, and a very awesome project.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. Kentuk55@yahoo.com

View Lenny's profile (online now)

Lenny

1488 posts in 2989 days


#10 posted 11-08-2014 02:04 AM

Thanks on all counts Roger.

-- On the eighth day God was back in His woodworking shop! Lenny, East Providence, RI

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