Using dies

mikey said:
Cutting threads with dies is a high pressure situation. Sulfur bearing cutting fluid works well for this.
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Uh, we're machinists and tool makers not scientists...

It's probably in the geometry of the thread cutting surfaces. Perhaps Mikey can help on this.
 
ezduzit said:
Hex dies are chasing/re-threading dies. Round dies are threading dies.
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First time I've heard of this. I've been using hex dies to cut new threads for decades and have not had a problem. I have used thread chasing dies but they are labelled as such.
 
Some not all rethreading dies have staggered teeth in them so they do a better job of repairing buggered up threads on bolts and parts. Usually they never come with a wrench in the sets. I'd keep an eye on craigslist or eBay and some auction sites . Greenfield is a great old maker. Union, butterfield another , most any of the old USA sets are the best.
Recently I saw a very big complete set in my area that if I remember was under $200 .
 
Greenfield ok junior set looks like both sae metric up to 1" with up to 3 sizes of dies its number 4700
Craigslist in NJ # 647-461-4220
Marlton $260.
 
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RandyM said:
I know the definition of them, what is the science?
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Fixed size thread restoring dies cannot be opened up to take a first cut on an awkward material on which it may otherwise be very difficult to get a thread started, otherwise there is little difference, I have ground a slot in HSS Hex dies and used them like normal split dies, using my skill and judgement to expand them as required ;-)
 
Thanks to all for the help, advice, suggestions, and links. It was all very helpful!
 
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