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The $75 Eight Foot Steam Box

Project by MattD posted 100 days ago 1208 views 18 times favorited 23 comments Add to Favorites Watch

This is my 8 foot steam box that I built for my Wooden Boat Project which is getting me into some new things like steam bending. I’m finding a lot of people happy with boxes built with insulation board. Other people are successful using wallpaper steamers as a steam source with wood, metal and PVC boxes. I came up with my own version combining these two trends. This could be a first! At least the first documented online that I could find. So far so good.

The entire box was made from a single 8×4 sheet of 1 3/8” thick TUFF-R insulation board (About $22), cut up and joined together into a box with a good amount of aluminum duct tape. Based on good and bad experiences from others, it’s best to use the foil backed rigid foam board and avoid the polystyrene pink/blue insulation boards. 1/4” square cedar strips are placed every 2 feet on the inside so that the piece to be bent will be elevated a bit for the steam to surround it. One end is sealed with a removable block of foam and the business end gets a towel stuffed into it to keep in the steam when in use. The opening is 12” x 6”. I elevate the box a few inches in the back with a few blocks of foam so that the condensation will run out the front and into a bucket on the floor.

The steam source is a Wagner 705 power steamer (wallpaper remover). The unit comes with an 11 foot hose ready to go like it’s made for this thing. I cut a hole on the top of the box to push the hose into. In 15 minutes, the unit starts producing a good amount of steam. In another 10-15 minutes, the inside of the box is over 200 degrees F (according to my wife’s candy thermometer) and ready to load. The foam insulation is obviously a huge help in retaining heat. The outside of the box is warm after an hour. The inside is brutally hot scalding steam. The Wagner is a $50 unit, so it may not be the cheapest steam source, but I think it’s one of the safest and easiest to deal with compared to hotplate/kettle or fuel based boilers. The water level is visible through the side and it has a thermal safety fuse if it runs out of water. The steamer holds 1 gallon and my results show it will produce steam for at least 1.5 hours. For a very big project where I’d be steaming all day, this could be a limitation. I’d have stop and refill with boiling water to avoid any interuption in steam, but this is ok with me. To run it all day, I might work out how to slowly refeed the unit from a larger bucket, or from the recycled condensation from the box, which is often done with small kettles.

Definately fun and easy to build and it was exciting to see how easy it was to bend a 1/2” test piece of white oak by hand after a half hour in the box! I’m not sure if the box will last forever, but it should get through quite a few projects.

-- Matt - Syracuse, NY


23 comments so far

View Sean's profile

Sean

83 posts in 507 days


posted 100 days ago

Rocks!

-- "Democracy is by far the worst system of government. Except all the others that have been tried." ~ Winston Churchill

View patron's profile

patron

2376 posts in 233 days


posted 100 days ago

just in time my man !
i was asked today if i knew steam bending ,
and this box looks good .
at first glance , it looked like angle iron welded .
but its quit simple .
thanks .
is there a place to check out the steam bending qualities of various woods ?

-- david ,new mexico ,allheart

View FirehouseWoodworking's profile

FirehouseWoodworking

103 posts in 165 days


posted 100 days ago

ABSOLUTELY BRILLIANT in its utility and simplicity! You have done well.

And now, I will engage in intellectual thievery and steal the idea to make one of my own!

YOU DA MAN!

(I, too, would agree with Sean and say that it “Rocks” but at my age, saying something like that would probably throw my back out of joint! So you’ll have to settle for BRILLIANT!)

Cheers!

-- Dave; Lansing, Kansas

View Karson's profile

Karson

25794 posts in 1293 days


posted 100 days ago

Patron: The dept of forestry. A federal agency has a book called the wood handbook. You can download it on the web for free. You can also download each chapter. One of them has the wood bending charactitics.

The steam box looks great. I assume the water from inside the tube is not recycled back to the steamer. So how long does the steamer put out steem?

-- What happens in the workshop stays in the workshop. No wait that doesn't sound right. Karson Southern Delaware karson_morrison@bigfoot.com †

View patron's profile

patron

2376 posts in 233 days


posted 100 days ago

thank you karson ,
im on it .

-- david ,new mexico ,allheart

View Karson's profile

Karson

25794 posts in 1293 days


posted 100 days ago

Patron: The dept of forestry. A federal agency has a book called the wood handbook. You can download it on the web for free. You can also download each chapter. One of them has the wood bending charactitics.

It looks like chapter 3 on working properties has a table table 3-8 Do a search for “wood handbook” it will probasbly be the first link

The steam box looks great. I assume the water from inside the tube is not recycled back to the steamer. So how long does the steamer put out steam?

-- What happens in the workshop stays in the workshop. No wait that doesn't sound right. Karson Southern Delaware karson_morrison@bigfoot.com †

View MattD's profile

MattD

131 posts in 836 days


posted 100 days ago

Karson – The steamer holds 1 gallon. It used around a half gallon in an hour, so I figure at least 80-90 minutes is safe to count on. The box is elevated in the back slightly so the condensation runs into a bucket right now. It should be easy to put a hole in the steamer and recycle with a tube from the bucket back into the steamer or do a siphon type rig with a larger bucket of water. I might do that when I get into steaming boat ribs. It’s not good to run out of steam.

-- Matt - Syracuse, NY

View kolwdwrkr's profile

kolwdwrkr

2246 posts in 482 days


posted 100 days ago

very cool.

-- ~ Inspiring those who inspire me ~

View Ben Kahmann's profile

Ben Kahmann

232 posts in 164 days


posted 100 days ago

$75 for a steam box, that’s great. Now I need a project so I can build one of these. I’ll fave this for later reference. Thanks

-- Ben Kahmann Dayton, OH

View SPalm's profile

SPalm

944 posts in 774 days


posted 100 days ago

That is sweet, good job. Bending is something I always wanted to try.
This looks like one of the most affordable, clean, and simple setups I have seen.

Thanks for sharing.
Steve

-- Stevethepeeve -- I'm no rocket surgeon

View jockmike2's profile

jockmike2

7297 posts in 1139 days


posted 100 days ago

Why does’nt the styrafoam insulation melt inside?

-- Mike. mwurm13@yahoo.com

View DaveR's profile (online now)

DaveR

1516 posts in 612 days


posted 100 days ago

Nice work Matt.

I’d like to build a steam box too. I’m thinking of building one like they have at the WoodenBoat School. It is built in sections so if you’re steam short pieces, you don’t have to fill a long box with steam. They also put in dowels across the width to make racks so you can put more pieces in and get the steam all around. Theirs is built of wood, though and I like your idea of using the foil faced foam.

-- Until you spread your wings, you'll have no idea how far you can walk.

View MattD's profile

MattD

131 posts in 836 days


posted 100 days ago

Mike – TUFF-R is made from polyisocyanurate which has a melting point of 300F. TUFF-R is rated for use up to 190F, so I’m pushing a little on the tolerances. Steam is around 212F. From what I could find, it’s important to use rigid foil faced insulation like TUFF-R and avoid the polystyrene types (the pink and blue boards) which can melt or deform like you point out.

Time will tell though. I think that the steam could eventually degrade the material, but it’s still rock solid after several hours.

-- Matt - Syracuse, NY

View ChrisN's profile

ChrisN

155 posts in 665 days


posted 100 days ago

That’s awsome.

-- Chris N, Westford, MA - "If you won't eat something from your fridge that turned green...why would you eat something that started out that way?"

View a1Jim's profile (online now)

a1Jim

16582 posts in 469 days


posted 100 days ago

great job

-- Jim from Heirloom Woodshop Southern Oregon

View glynn's profile

glynn

50 posts in 212 days


posted 100 days ago

thank you Ive thought of building a steam box but none of my own ideas to add steam were that reasonable. great job ,I,ll do it .since I think all the LJ s are a bit bent there should be a few of these out there soon.thanks

-- jim nevada

View PurpLev's profile

PurpLev

2732 posts in 541 days


posted 100 days ago

this looks great! I’d be interested to see how it holds up after long use. definitely a future project when time and space come around.

Thanks for sharing this one.

-- When in doubt - There is no doubt - Go the safer route.

View jockmike2's profile

jockmike2

7297 posts in 1139 days


posted 99 days ago

Thanks a pant load for answering my question. I could work around that like Dave was talking about.

-- Mike. mwurm13@yahoo.com

View Splinterman's profile

Splinterman

4827 posts in 253 days


posted 99 days ago

Hey Matt,
Good cheap effective device…..well done.

-- I will just keep doing it till I get it right.

View Innovator's profile

Innovator

3125 posts in 306 days


posted 98 days ago

Nice looking steamer Matt, thanks for sharing this. I just need to find where to put it in my shop, maybe its time for the car to leave the garage.

-- Whether You Think You Can or You Think You Can't, YOU ARE RIGHT!!!

View Jim's profile

Jim

51 posts in 969 days


posted 98 days ago

I guess this is one instance when running out of steam won’t be helped by a little blue pill. Sorry, couldn’t resist…

-- Jim, www.greenteawoodworking.com

View prez's profile

prez

110 posts in 303 days


posted 97 days ago

I asked about steamers awhile back and got a few ideas/suggestions…....but this is the way to go for my small scale bending projects (making wooden steering wheels for old cars.)

Will definitely “borrow” your idea and run with it. Don’t think I’ll need all of 8 ft of it but probably 6ft will be enough….

-- George..." I love the smell of a workshop in the morning!"

View Chris Wright's profile

Chris Wright

359 posts in 373 days


posted 97 days ago

I use a 6 inch PVC pipe for my steam chamber. Works really well too. This might be cheaper though. Great idea, thanks for sharing.

-- "At its best, life is completely unpredictable." - Christopher Walken

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