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I Forge Iron

how to make blower for forge

Azur Jahić

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We need more information, gas forge, solid fuel forge, what type fuel, etc.

Look for anything that puts out air. Many machines have fans to cool the machine. Automobile fans for blowing heated or cooled air run on 12v DC, and every vehicle has one. You can build a box bellows, sack type bellows, or water bellows.

The thing is if you say you can't, then you can't.
If you want then you can find a way to get it done.

There are many discussions on IForgeIron about getting air to the fire. A little research will open doors which open more doors once you start chasing down information. But it up to you to do YOUR homework.

If you add your location to your profile, it will let us better answer your questions knowing where in the world you are located.

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Did you drop if from a plane?

Looks to me like you have too many gaps. A section of sewer/water pipe makes a great chamber for a bellows. Just because it's called a box bellows doesn't mean it has to be made from a box.

Take a length of pipe that's about 6" in diameter. A cap for each end. The plunger passes through one end, and the air pipe to your forge originates at the other end. The working end of the plunger can be a simple disc of wood that's fairly tight to the inside.

And be sure that the pipe leading to the forge is of sufficient diameter so the air flows easily.

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Tar paper isn't flexible, but could seal panels. Can you get heavy canvass, leather, thick vinyl or other flexible air tight material? Old leather couches, old rain coats or trench coats, awnings, tents, drop cloth, tarp? Building a bellows with soft sides seems easier than a box bellows in my opinion.


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about 1 cubic foot displacement (about 30 liters) per lung should be the small side of adequate. Someone who has built bellows can probably give better information.

Of course adjust your dimensions to your materials.

I estimated that from the plans linked in post #8 of this thread
and measuring a car tire, since tubes are hard to find anymore.

some other links with different drawings/plans


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Links, apologies for duplicates



May or may not be helpful I am working on a small bag bellows and may need a diverter


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As we discussed in chat the drawwing will not work for a forge bellows, It does not have valves, When you push the operating handledow the air will comeout that hole in side of the bottom...when you lift the handle the air will come from the forge right back into the bellows, thgta may also bring with it hot air and sparks that may destroy your bellows.

I gave youi a link with instructions on how to build a bellows with drawings. Was that of any help?

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Looks like an old work jacket. That material should be fine but may need to be painted with a flexible material if it leaks too much air. I am not sure what the black material is, but if it is durable and flexible you could make a hinge or valve out of it since it looks small.

harris and heers blacksmithing pdf
and you can download a copy.
Bag bellows are illustrated in Harris and Heers, Basic blacksmithing on page 105. Box bellows are a couple pages later.

I realized last night that a pair of sturdy pants (slacks) could be made into a bag bellows, or pair of bellows, very easily, but would destroy the pants. Your old jacket sleeves may work as well. Because your hand acts as the intake valve, a valve on the exit is not explicitly necessary (but may be helpful). Two smaller bellows can be joined with a T or Y. Two smaller bellows would of course require both hands to operate. In videos they are frequently operated by a second person.


I argue a soft sided bellows is easier to build because less exact carpentry is required, or in some cases no carpentry. The leather, or canvass take up small errors in measuring and cutting of the wood.

A more sophisticated system will give you better, long term performance with less effort to use, but a simple system can get you forging sooner. If your hair dryer is working I would stay with it for a while.

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http://dogonlanguage...ga_juuri_JH.jpg i have old bycicle i thin to make bellows usin power of the bike
puting tube on wheel and make like hand crank bellow by the way my hair dryer is break, it over temperaturing and get red and break up.And i deside not using electricity But i can made iron to get red colour with hair dryer. I dont see this picture clear but i think i have material to make hand crank blower with bicycle part can you explain me how i can i use old jacket to make bag bellows and can you sand me a lin of that book i type on google and i dont find

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Seems to me like the longer this thread goes on the more folks put different ideas on and he is confused more now than when he started. Someone suggest one thing then another then another, he is limited as to wot he has availeable and does not have anyone close he dcan go to for help.
Azur pick one of the methods and stick with it. Pick one htat has directions that work for you and that youi can make with the materials you have or can find..Ignore the rest of us.

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here's a few threads with pictures of taken apart blowers. They are very simple. The intake is a large hole in the side of the case inline with the axle, and the exhaust is out the side. The large paddles move the air. If the exhaust is centered the fan can operate in both directions, if it is tangent it should operate in only one direction.

My blower uses about a 50:1 gear ratio and is about 12 inch diameter. Some hand crank blowers are about 16 inch in diameter. There is no need to limit your material choices as heavy sheet metal or thin plywood will be stiff enough for paddles, the case can be made out of an old cookie tin from the holidays. The hard part is getting the bearings set up, but if you have the back portion of a bike and its crank then you can mount the cookie tin to the frame and the paddles to the rear wheel hub, without the rest of the wheel.

You could also use thin wood that can flex around to make the case, or heavy wood for the sides and thin metal to wrap. Inexpensive bearings or bushings can be mounted into a lumber U frame supporting the blower as long as the space for air intake is allowed for. Bushings (bearings) can be made from copper water pipe and if kept lubricated be expected to last a couple years of use against a smooth steel shaft.


Feel free to take apart any available blower from an old dryer or furnace to use. If it is belt driven you can just make it hand crank instead of motor driven. A 12 inch furnace blower running at a slower speed will still put out a whole lot of air. Might as well use the whole assembly if it can push the air without too much effort.


12 inch is about 30 cm
16 inch is about 40 cm

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