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Posted: 3/28/2006 5:11:05 AM EDT
[#1]
Usually one side is chamfered (and marked "start this side") to make it easier to start the die on the round stock. So, this is the side you start first. I don't know why a die would be chamferd on BOTH sides as the usual procedure is to start the die on the side so marked, thread all the way to a shoulder if that is the application, then turn the die around and run it on again, this time running the unchamfered side all the way to the shoulder to finish the thread.
I hope this helps, efxguy |
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Posted: 3/28/2006 5:14:26 AM EDT
[#2]
Beats the hell out of me.
Never saw a die like that in my time at the shop. Then again I was deburring 70% of the time 
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Posted: 3/28/2006 5:17:40 AM EDT
[#3]
Yep it does help. That is what I was told and have done in the past. However I just bought a thread cutting die from Brownells (made in Japan, just regular HSS) and both sides were identical 
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Posted: 3/28/2006 7:12:38 AM EDT
[#4]
Weird, though I suppose, unless you were threading to a shoulder, that you would get twice the life from a die by having two sets of starting threads, the part that gets the most wear. I guess this would be like having a double ended end mill, twice the life.... efxguy |
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Posted: 3/28/2006 12:44:19 PM EDT
[#5]
chamfer side to start
flat side to thread to a shoulder i got the same die from brownells and in their new products catolog they show a thread alignment tool. |
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Posted: 3/28/2006 1:27:25 PM EDT
[#6]
I got a different sized die from Brownells (it's not for the AR). It's chamfered on both sides. |
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Posted: 3/29/2006 12:51:36 AM EDT
[#7]
So how do I cut to the shoulder w/o a flat side on the die?
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Posted: 3/29/2006 6:25:26 AM EDT
[#8]
Sounds like you need a relife groove cut next to the shoulder. If you can't cut a relife groove then run a drill bit larger then the thread O.D. (into the part your threading on), drilling it just deep enought to compensate for how far away your threads are from the shoulder. Counter boring the threaded part will do the trick if the part isn't to hard to drill.
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