[AT] Spam> OT: Hand threading steel pipe

[CEE VILL]

Gary,

If you are using a "modern oil" rather than something you have had around, that could be the problem.  The old fashioned heavy black high sulfur cutting oil is not what it used to be due to environmental restrictions.  Active sulfur and chlorine are no longer acceptable and they were the main components for anti galling and extreme pressure years back.  Various blenders may use several substitutes in today's oil, and some work better than others for a given application.  If you know of a large plumbing supply or an oil blender in your area, check them for their recommendation.  They may even offer a quart or gallon as a free sample for you to try.  Ten percent or higher level of animal fat is not a bad thing to prevent tool loading and part galling. 

God luck.  
Charlie V.

> From: K7jdj at aol.com
> Date: Thu, 19 Nov 2009 19:49:23 -0500
> To: at at lists.antique-tractor.com
> Subject: [AT] Spam> OT:  Hand threading steel pipe
> 
> OK boys and girls,
> 
> I occasionally get  involved in projects that require hand threading 1/2 
> inch through 1 inch   black iron pipe.  Lately I have been having trouble with 
> the threads being  damaged.  I bought new cutters for my 3/4 inch die but 
> still  having trouble.  The threads seem to get damaged toward the end of the 
>  cutting process.  I try to get the shavings and chips removed and back off 
>  the cutter to "break" the chips loose but continue to have poor threads.  
> I  use dark cutting oil and lots of air to clean the cutter.  Any  
> suggestions?  A local plumber said it was mostly the "import" pipe and that  hand 
> cutting is difficult because of the lack of continuous motion when using a  
> ratchet type of cutter.
> 
> Gary
> Renton, WA  
> 
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