paragon53 Posted March 27, 2009 Share Posted March 27, 2009 I am just thinking and tinkering around about building a hand crank forge blower. I was wondering if any one out there has a good image of the gearing layout and perhaps the size of the gears / ratio. Thanks Lee Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 27, 2009 Share Posted March 27, 2009 Below are pics of blowers in use in Viet Nam posted by a traveler. One is set up and in use, they hang on a wall out of the way and the air is ducted to the ground forge. The other pic is a pile of several forges for sale in a market. Think how cool it'd be to build one with a flywheel and 10 speed gear train. Hmmm? Lots of options available. Frosty Quote Link to comment Share on other sites More sharing options...
Finnr Posted March 28, 2009 Share Posted March 28, 2009 Huh????????? Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 28, 2009 Share Posted March 28, 2009 Eh? Frosty Quote Link to comment Share on other sites More sharing options...
Finnr Posted March 28, 2009 Share Posted March 28, 2009 Seems that Glenn found the extremely strange post I was commenting on. LOL! Finnr Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 28, 2009 Share Posted March 28, 2009 And this is it? You two must lead a very sheltered life. My sympathies. Frosty Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 28, 2009 Share Posted March 28, 2009 Delete repeat please. Frosty Quote Link to comment Share on other sites More sharing options...
IanR Posted March 28, 2009 Share Posted March 28, 2009 Or you could use a couple of monkeys. Seriously though I'm sorry I cant help you with some gearing diagrams, I'll keep an eye out though. Ian Ross Quote Link to comment Share on other sites More sharing options...
element Posted March 28, 2009 Share Posted March 28, 2009 O my, There is monkeys cranking the blower!! This might be more doable.Box Bellows Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 28, 2009 Share Posted March 28, 2009 Boy, would that crew fit in here! Frosty Quote Link to comment Share on other sites More sharing options...
paragon53 Posted March 31, 2009 Author Share Posted March 31, 2009 Frosty, You were not far off about the bicycle parts. I was planning on using an old crankset and a freewheel hub. Not so much a 10 speed though. I don't think I would have enough room for a dearileur system to change the speeds. I would be using a 53 tooth crank and a 14 tooth cog on the fan shaft. Lee Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 31, 2009 Share Posted March 31, 2009 That's only a about 3.8:1. The Vietnamese blowers are hung on a wall out of the way and they're using the wheel rim for the large pully. Since I got a look at these things I've occasionally thought about how to make a groove in the tire for a belt and still be able to fill it with something heavy like concrete for a flywheel. maybe the answer is to use two wheels, one for the pully and the other weighted as a flywheel. Just a few random neuron firings. Frosty Quote Link to comment Share on other sites More sharing options...
Jacques Posted March 31, 2009 Share Posted March 31, 2009 Since everytime I finish something someone make something better and quicker and easier here is my take on a bicycle part blower I roughly assembled today. The only manual forge blower I've seen in my life is this one. It works, sort of, but I agree that this 3:1 gear ratio isn't enough. What is the typical gear ratio of a commercial blower? I couldn't find anything about that anywhere. My investment in this so far is a few hours, off-cuts and $10 worth of bicycle parts. Back to CAD again. Quote Link to comment Share on other sites More sharing options...
Frosty Posted March 31, 2009 Share Posted March 31, 2009 Jacques: You did a nice looking job on the blower, it looks like it'll move quite a bit of air. You can mount a jack shaft and up the gear ratio easily, there's plenty of room. If you extended the jack shaft a little you could put a fly wheel on it to save some sweat too. I'd drill or punch a hole in the crank handle and using a long bolt mount a wood or pipe handle so it doesn't wear holes in your hand. Frosty Quote Link to comment Share on other sites More sharing options...
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