Derek Haiges Posted April 1, 2018 Share Posted April 1, 2018 Constructing coal forge. I am deciding whether to simply leave the end of the pipe open, OR cap the end and drill holes/ grind slits perpendicular to pipe. One large opening V.S. many small openings Am i correct in assuming that the first option will create greater temperature due to more air concentrated, while the ladder will spread out the heat over a larger area? What are the pros and cons of both. If anyone has experience or knowledge regarding the topic, it would save me much trial and error. Thanks -Derek P.S. Im using zomax hand crank blower. Any suggestions on pipe diameter? I plan on using 3/4" Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted April 1, 2018 Share Posted April 1, 2018 First question is are we building a sideblast or bottom blast forg? Different considerations. Fuel type and expected work size also effect our choices. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted April 2, 2018 Share Posted April 2, 2018 Well there are probably several thousand years of experience on this site with coal forges; I've go 35 or so myself, (started 37 years ago with charcoal...) HOWEVER you haven't told us anything about the type of forge you are building---I'm building a car with a gasoline engine---does the engine go in the front, the middle or the back? Quote Link to comment Share on other sites More sharing options...
Irondragon Forge ClayWorks Posted April 2, 2018 Share Posted April 2, 2018 23 hours ago, Derek Haiges said: P.S. Im using zomax hand crank blower. Any suggestions on pipe diameter? I plan on using 3/4" That 3/4 inch pipe will be too small, especially if you are building a bottom blast with a fire pot, use the same diameter pipe as the blower outlet. Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted April 2, 2018 Share Posted April 2, 2018 Acualy 3/4” schedual 40 pipe is just about ideal for a side blast charcoal forge, tho ideally you want a cone from the size of the Bowery to the outlet. A pipe the size of the blower into a reducing bell works just fine, a reducing bell into a long 3/4 nipple induces more friction. A bottom blast forge usually uses a 2” Tuyere, then a grate of some kind. Quote Link to comment Share on other sites More sharing options...
Derek Haiges Posted April 3, 2018 Author Share Posted April 3, 2018 I plan on entering the 3/4" pipe through the back of the forge. Back blast, if thats a thing? All i know is that it would not be a bottom blast. Imagine the difference between an open end garden hose v.s having a shower head. Im deciding if i should leave the end of the pipe open, or cap the end and drill a series of smaller holes? How will they differ in terms of temperature, fuel consumption, overall heat etc. Personal opinions are also appreciated. Thanks- Derek Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted April 3, 2018 Share Posted April 3, 2018 Hand crank will probably be ok with open end---you can crank slow enough to not overwhelm the fire. Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted April 3, 2018 Share Posted April 3, 2018 No need to cap and drill unless you use a bigger pipe Quote Link to comment Share on other sites More sharing options...
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