blackleafforge Posted December 16, 2016 Share Posted December 16, 2016 I have notice and heard smith make reference to the fact that working stock hard keeps the heat in. I find this mostly applicable when drawing down very small stock but I was wondering about what was going on. I assume that the impact of the hammer will generate a small about of heat through friction but I don't think that accounts for it. I thought it may have something to do with compression? I also noticed this video that i assume is working off the same principle. does anyone smarter than me know what exactly is going on? Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted December 16, 2016 Share Posted December 16, 2016 Physics states that energy can not be created nor destroyed. only transferred As you hit metal, the energy of the falling hammer into the stock that is not used for hammer rebound or moving metal, is converted to heat. simple, but the formula to show how that gets divided is a bit more complex Quote Link to comment Share on other sites More sharing options...
BIGGUNDOCTOR Posted December 16, 2016 Share Posted December 16, 2016 What happens when you compress air? It heats up, and can get hot enough to get a fire going. Internal friction in the metal from moving produces heat. Quote Link to comment Share on other sites More sharing options...
Glenn Posted December 16, 2016 Share Posted December 16, 2016 Moony from Australia did a video a while back on the same subject. Quote Link to comment Share on other sites More sharing options...
Dale Russell Posted December 16, 2016 Share Posted December 16, 2016 no other comment needed http://www.iforgeiron.com/topic/5463-party-trick/#comment-50745 Dale Russell Quote Link to comment Share on other sites More sharing options...
Tubalcain2 Posted December 16, 2016 Share Posted December 16, 2016 if it wasn't for the fact that he is giving himself lung cancer that would have been awesome. i'll have to try that...... Quote Link to comment Share on other sites More sharing options...
Mark Ling Posted December 16, 2016 Share Posted December 16, 2016 I winced at the sight of the hot cut In the hardy hole, and even on the same side of the anvil as his hammer hand. But, he didn't loose a finger, so that's good. Yet. Littleblacksmith Quote Link to comment Share on other sites More sharing options...
Judson Yaggy Posted December 17, 2016 Share Posted December 17, 2016 I notice that effect most when working under the power hammer, after all the energy involved is an order of magnitude (give or take) more then when working by hand. Crush atoms past one another they get excited. Electrical assist aside, on some smaller stuff for example upsetting rivet heads, if you hit hard enough fast enough you can get another second or two (2 or 3 blows) more out of a heat. Makes the difference between needing another heat or finishing the part in one cycle. Worth training up to get to that level. On a side note, if you can hit the same spot 1 or 2 thousand times before lunch a hot cut in a hole 10 inches away is probably not a big deal. I agree that it should be strongly cautioned against for beginners but of all the things that could kill or maim you in a blacksmith shop that one is pretty far down my list. Quote Link to comment Share on other sites More sharing options...
Mark Ling Posted December 17, 2016 Share Posted December 17, 2016 1 hour ago, Judson Yaggy said: I notice that effect most when working under the power hammer, I don't own a power hammer, but can relate when working on the far edge of the anvil. like when drawing out lets say a rr spike, if I work fast enough and draw it out how you should on the far edge of the anvil, than it will light up from a dull red to a bright yellow, and I can keep it that way so that I can go from 5/8 down to a little less than 3/8. Littleblacksmith Quote Link to comment Share on other sites More sharing options...
ausfire Posted December 17, 2016 Share Posted December 17, 2016 6 hours ago, littleblacksmith said: I don't own a power hammer, but can relate when working on the far edge of the anvil. like when drawing out lets say a rr spike, if I work fast enough and draw it out how you should on the far edge of the anvil, than it will light up from a dull red to a bright yellow, and I can keep it that way so that I can go from 5/8 down to a little less than 3/8. Littleblacksmith Man, that's some feat LB! I've drawn out many a rail spike and hit as hard and as fast as I can at times, but I can't match that. Quote Link to comment Share on other sites More sharing options...
Glenn Posted December 17, 2016 Share Posted December 17, 2016 7 hours ago, littleblacksmith said: When working on the far edge of the anvil. like when drawing out lets say a rr spike, if I work fast enough and draw it out how you should on the far edge of the anvil, than it will light up from a dull red to a bright yellow, and I can keep it that way so that I can go from 5/8 down to a little less than 3/8. Little blacksmith, Can you can please post a video of working the rr spike on the far edge of the anvil, than it will light up from a dull red to a bright yellow, and I can keep it that way so that I can go from 5/8 down to a little less than 3/8. Please mention IForgeIron in the video so we know it is the read deal. Quote Link to comment Share on other sites More sharing options...
SmoothBore Posted December 17, 2016 Share Posted December 17, 2016 A vivid imagination can be a useful thing. . Quote Link to comment Share on other sites More sharing options...
Mark Ling Posted December 17, 2016 Share Posted December 17, 2016 Ok, ill be out of town today, but can maybe do it then. funny thing is, is that I was planning on making a pair of flat jaw tongs out of some rr spikes, so this will fit right in. A bit clarification, just in case I wasn't clear enough. When I pull the spike out of the forge, it is a bright yellow, almost a forge welding heat. Then I begin drawing it out, and it obviously begins to cool. So, by then picking up my speed some, I can light it up. Now, I'll be honest, it may have been a bit of an exaggeration when I said from a dull red, to bright yellow. More like a red to a yellow. And when I said I can keep it that way, I meant that I can keep my pace, and in return, keeping the spike hot up to a point. Also, I'm not drawing out the entire spike in one heat down to 3/8", just a part of it. Littleblacksmith Quote Link to comment Share on other sites More sharing options...
Tubalcain2 Posted December 17, 2016 Share Posted December 17, 2016 i got your meaning. Quote Link to comment Share on other sites More sharing options...
Smoggy Posted December 17, 2016 Share Posted December 17, 2016 I've seen a video of aJapanese Swordsmith light his forge by hammering an iron rod to light a piece of paper, traditional I believe. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted December 17, 2016 Share Posted December 17, 2016 New students often comment on how I can work a piece much longer than they can between re-heats; they generally have not noticed that I'm hitting several times faster and much harder than they are---more "WHAM WHAM WHAM WHAM" to their "tap tap, stop and look at it" Quote Link to comment Share on other sites More sharing options...
SmoothBore Posted December 19, 2016 Share Posted December 19, 2016 One of my biggest issues, is that after a few hammer blows, I want to look at the piece, ... and think about it some more. Obviously, that's counterproductive, ... but it makes me happy, ... and that's why I came ..... . Quote Link to comment Share on other sites More sharing options...
Marc1 Posted December 19, 2016 Share Posted December 19, 2016 Ha ha ... tap tap and look at it ... seen that on you tube Quote Link to comment Share on other sites More sharing options...
Frosty Posted December 19, 2016 Share Posted December 19, 2016 3 hours ago, SmoothBore said: One of my biggest issues, is that after a few hammer blows, I want to look at the piece, ... and think about it some more. Obviously, that's counterproductive, ... but it makes me happy, ... and that's why I came ..... . I'm with you, I didn't get into this to make things hot by the sweat of my brow. Beat it for a while, take a look and think a while is my thing too, nor do I swing a very heavy hammer. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
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