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| vtsteam:
Check the image in this post, it's from Andrew Weyger's Blacksmithing books. It shows a natural draft forge made from a can and stovepipe. I don't personally think that much stovepipe is necessary -- probably a couple feet would do. In fact another fire extinguisher, maybe. http://www.iforgeiron.com/topic/29696-my-better-bellow/?do=findComment&comment=304844 |
| awemawson:
That illustration of the hanging forge looks like an excellent way to set fire to a tree :bugeye: |
| S. Heslop:
--- Quote from: vtsteam on June 14, 2015, 07:15:55 PM ---Simon, I think natural draft might have worked better. --- End quote --- I think having a more controllable blower would've helped. I had the outlet of a vacuum cleaner and tried a few crude ways of adjusting the air but none of them worked. Plus I started to get concerned about the top layer of charcoal not igniting, and so I was going full blast to try get the air to reach the top as well. I did also think about removing the files and then putting them back in when it got hot, but to get the files in they had to be hammered down, which I wasn't so excited about doing over the hot coals. |
| vtsteam:
Simon if you happen to need to control a blast in a simple fashion without a normal diverter, you can just have short pipe on the blower separated from a longer pipe in the tuyere. You just alter the distance between the two, and the aim between them until your furnace is running at the rate you want. A few bricks can hold the pipes in position. Andrew, I'm sure Mr. Weygers was careful not to burn down his tree. The devil is in the details, as in most things having to do with fire, Including bonfires, campfires, etc. His books are blacksmithing classics, and I admire them greatly. I can hold my hand two feet above the 2' length of stovepipe I set on my current melting furnace comfortably, and that is while melting metal with a blower, not just forging small parts in a tin can forge with an atmospheric draft. A longer pipe suspended well below a limb on a small atmospheric forge as shown will run quite cool. Most anything we do can be dangerous if approached without awareness. Running a blown exhaust direct into pine needles during a drought wouldn't be advisable, but I think most people wouldn't do that. I wouldn't even run my iron furnace in the clear under drought conditions. Even running a hand grinder can be danerous then. An illustration of what the author found useful does not absolve people from using good sense when doing the same. |
| S. Heslop:
--- Quote from: vtsteam on June 15, 2015, 08:39:34 AM ---Simon if you happen to need to control a blast in a simple fashion without a normal diverter, you can just have short pipe on the blower separated from a longer pipe in the tuyere. You just alter the distance between the two, and the aim between them until your furnace is running at the rate you want. A few bricks can hold the pipes in position. --- End quote --- I was actually trying something similar to that, by angling the vacuum cleaner nozzle on the end of the pipe going into the extinguisher. Sort of balancing it at an angle so it wasn't throwing all the air in. But like I said I decided to go for full blast to try get the charcoal on top burning. But yeah I think i'm done with this rasp stuff now. I'd have to find some more old files to continue it for starters. |
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