Stephen Olivo Posted February 2, 2013 Share Posted February 2, 2013 I don't know if anyone else is interested in this process. I was watching the woodwrights shop today and they went over a tap and die that was over 100 years old and I thaught that was interesting so googled it and it brought up a pretty good link. Just thought I would share. http://americanlongrifles.org/forum/index.php?topic=18831.0 I may have to make a plate for doing this sort of thing it seems like a fun thing to try out. I have been thinking about making my own tap and die for a while now ... Just because I can. Quote Link to comment Share on other sites More sharing options...
Wayne Posted February 2, 2013 Share Posted February 2, 2013 In one of the woodwright books is a step by step section on hand making taps andthen on making a wooden die box to put threads on wood. Quote Link to comment Share on other sites More sharing options...
doc Posted February 2, 2013 Share Posted February 2, 2013 Stephen, Sounds like a great project! Remember though if you don't have wrought iron you should use one of the leaded/free machining alloys because these threads aren't cut but swaged. A-36 or plain cold rolled will be too hard for this process. Quote Link to comment Share on other sites More sharing options...
Francis Trez Cole Posted February 2, 2013 Share Posted February 2, 2013 that is very cool thanks Quote Link to comment Share on other sites More sharing options...
Stephen Olivo Posted February 2, 2013 Author Share Posted February 2, 2013 Doc: I do have some wrought. But yeah that is one thing talked about. Just seemed interesting. If I do make it I will deffinatly look into those alloys. Thanks for the coment and info. Wayne: I have those books and thats something I plan on doing when I can pull out the forge again. Its been one of many things on my list for a looooong time :D Francis: Your welcome :D Quote Link to comment Share on other sites More sharing options...
rockstar.esq Posted February 6, 2013 Share Posted February 6, 2013 I'd like to know how these were made. The process is swaging the screw blank so it seems like if you'd just cut threads with a tap, the resulting tool would act like a die and cut as well. Am I missing something? Thanks, Quote Link to comment Share on other sites More sharing options...
Dan P. Posted February 8, 2013 Share Posted February 8, 2013 What's the difference between a swage and a regular thread-cutting die? Also, I've tapped a bit of wrought iron in the past, and it can be a bugger when the tap catches on a bit of slag- it'll have you doing the snapped-tap war-dance in no time! Not such a problem cutting the male threads (what is that called? Die-ing??). Quote Link to comment Share on other sites More sharing options...
doc Posted February 8, 2013 Share Posted February 8, 2013 The reason taps and dies for wrought iron weren't made to cut like those for mild steel is because of the grain or fiber structure of wrought iron. Imagine the fibers of the iron running lengthwise along the bolt. If the threads are cut with a modern die the edge of each thread from peak to root is going to be all short grained fibers just like the end grain on a piece of wood, so it has no real structural strength. On wood screws threads cut with a file instead of swedging are acceptable because the wood will always be weaker than the iron. Swedging for wood screws was used because it made the process quicker. But when it comes to machine screws. It was used for structural purposes. The old blacksmiths tapered taps do the same thing based on swedging the thread for similar reasons. In both cases whether making male or female threads. It's actually more a form of extruding rather than swedging. The material that forms the thread is forced into the crevices of the tap or die as a tool is either work over the material for a male thread or force into the material for a female thread. The use of the terms swedging or extruding is a matter of semantics.:-) Quote Link to comment Share on other sites More sharing options...
John B Posted February 8, 2013 Share Posted February 8, 2013 Today they thread roll on mass produced bolts/screw, This is also a form of swaging (swedging ?) Quote Link to comment Share on other sites More sharing options...
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