I'll add a little to what Charly said.
If you're going to make a Japanese bellows (or a "box" as I call it)
then make it to fit you work area, and of a size that you can manage to
Bigger is better as you can push and pull a larger volume of air.
Don't know sizes for "Japanese Bellows" but I saw Hmong bellows some
years ago. A tube about 8 inches in diameter and about 4 feet long.
Piston rod went all the way through both ends with handles at both ends
so it could be operated from either side. Piston was 2 slices of thin
wood that held chicken feathers. Don't remember valving, but tuyere was
simple river clay molded into a tapered pipe about 8 inches long let in
to the middle of the tube. It was double acting.
Boy, can those guys ever make neat knives and edged tools out of jeep
leaf springs with REAL basic tools!
Was it horizontal or verticle? In Weyger's book he shows an
illustration of an indonesian setup that is similar. I think it was two
verticle tubes powered by a kid. No valving....
Your description seems like it would be an easy homeimprovement store
setup. A pvc pipe, some carpet , a plunger.....
I've only seen it once in a movie, but a chinese girl was cooking with a
stove that had what looked like a box bellows built in. Anyone ever seen
anything like that?
Try this link, its a set of plans, sizes and some pics. Also on the
index page you will find some other useful info. Personally I like my
powered blower, its a lot less trouble than cranking a blower, which I
did for quite some time. You could upgrade to a Vaccume cleaner,
running in reverse - I used the type that you change the hoses over.
But you will need an air gate, or you will blow the fire out of the
forge....... its not a fun experience.
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