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Tool Talk Discussion Forum

Threading 1/2 rod

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al

01-21-2004 17:34:50




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I have just tried to hand thread a standard 1/2 rod. The kind you buy at steel supply place. Comes in twenty foot lenghts of mild steel My die is a small new hex HSS 1/2 NC 13. I beveled the end of the rod with my grinding wheel to enable me to start the thread. The first 1/2" went quite well. I used cutting oil and kept backing off the die and cleaning out the small cuttings from the thread. After I reached about an inch the die increasing became harder to turn. I measured the rod with a sliding scale ruler and it seems a constant 1/2" dia. - I do not have micrometers I stopped as I was afraid that by turing it this hard it would break. Please advise me as to my problem.Thanks in advance.

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FarmerTom

01-22-2004 04:16:48




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 Re: Threading 1/2 rod in reply to al, 01-21-2004 17:34:50  
there are 2 kinds of 1/2" round rod. one is mild steel and with a vernier caliper will measure unevenly and always a few thousands over 1/2". when you cut the threads in this it will cut hard and the threads themselves will have small chunks out of them. the other kind of 1/2" is machine steel or often called "stressproof". it measures 2 thousands under 1/2" all the time and is primarily used for shafting and making threads. you can recognize it by cutting a tiny piece of the end and then you'll see partial circles on the end of the material. this is good stuff and cuts easily, is strong and makes a beautiful thread. my 2 cents worth.

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al

01-23-2004 18:40:59




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 Re: Re: Threading 1/2 rod in reply to FarmerTom, 01-22-2004 04:16:48  
I suspect it is cold rolled. Does not have partial circles on the end. Thanks for your post.



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Slowpoke

01-22-2004 21:48:46




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 Re: Re: Threading 1/2 rod in reply to FarmerTom, 01-22-2004 04:16:48  
Is the machine steel hot or cold rolled?



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FarmerTom

01-23-2004 04:20:17




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 Re: Re: Re: Threading 1/2 rod in reply to Slowpoke, 01-22-2004 21:48:46  
i think it's hot rolled but not sure.



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Bob

01-21-2004 20:55:11




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 Re: Threading 1/2 rod in reply to al, 01-21-2004 17:34:50  
More than likely your die is crooked. You will probably not be able to get it completely straight freehand. Even though it may look straight. If you cannot use all-thread to accomplish what you are trying to do, then I suggest you take it to a shop with a lathe and they can cut your threads for you. As much time as is wasted by trying to do it freehanded, you could have it cut on a lathe. One other suggestion, take it your local high school, if they have a lathe, they will sometimes do this quite cheaply. Good Luck.

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RusselAZ

01-21-2004 18:02:49




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 Re: Threading 1/2 rod in reply to al, 01-21-2004 17:34:50  
I'll bet it is threading crooked. If you are not using a guided dye you can't start it straight.



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ralph

01-21-2004 18:48:11




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 Re: Re: Threading 1/2 rod in reply to RusselAZ, 01-21-2004 18:02:49  
In my opinion you are just using a good thread chaser. A guided dye is just that it has a guide to help get it straight. I have a collection of Greenfield little giants, which is a two piece adjustable dye with guides. Craftsman also used them for many years but the new ones I have been around are just what you describe.



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PBuck

01-21-2004 18:58:41




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 Re: Re: Re: Threading 1/2 rod in reply to ralph, 01-21-2004 18:48:11  
I agree with Ralph. You most likely have a tread chaser, another thought-did you buy cold rolled or hot rolled round stock? Cold rolled will be harder to cut threads.



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Al

01-21-2004 18:18:53




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 Re: Re: Threading 1/2 rod in reply to RusselAZ, 01-21-2004 18:02:49  
Thanks for your help! What is a guided die? Or do I need to make a set up that would start the die correctly? I need to thread about 2" on each end of eight 17" long rods.



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Ray,IN

01-21-2004 18:49:37




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 Re: Re: Re: Threading 1/2 rod in reply to Al, 01-21-2004 18:18:53  
A guided die stock has adjustable jaws on one side. You adjust the jaws to fit the 1/2" rod in your case, start them on the rod first, and they guide the die stock straight onto the rod enabling the button die to cut straight and true. You are using the correct threading procedure, it's just difficult to cut that amount of threads offhand without the guides.



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thurlow

01-21-2004 18:45:21




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 Re: Re: Re: Threading 1/2 rod in reply to Al, 01-21-2004 18:18:53  
Why not just buy all-threaded rods and cut to length; assuming they're strong enough for what you're doing.....



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D.L.

01-21-2004 21:18:23




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 Re: Re: Re: Re: Threading 1/2 rod in reply to thurlow, 01-21-2004 18:45:21  
around here we can buy "graded" all thread... corresponds to about a grade 5 bolt. I've used for a variety of jobs... never had a failure!



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