Internal Threading. What Single Point System To Buy?

I made one, used a 1/2" dia drillrod and a broken No. 6 tap, drilled a cross hole and a set screw hole, ground a threadform on the end of the broken tap, and made an ER50 collet holder for my lathe, threaded it 1" 10 to fit the lathe.
 
Like T Bredehoft I built my own. Nothing fancy, a piece of .375" CRS drilled near end , 1/8" square HSS tool bit scrap ground to 60V slips thru it and is held by set screw coming in from end and top. I have maybe $2 into it, I have used it since 2003 when I built it. I can cut threads with it in a bore as small as .625". It looks crude but has gotten the job done for me when needed. I have made a few mistakes internal threading with it. All operator error, a few licks with the diamond hone and back in business. If I were doing internal threads all the time I might go carbide but for occasional use home built HSS is the ticket IMO.

In case someone wonders I have no problem with carbide, and I love my numerous Circle brand solid carbide boring bars with replaceable inserts. I also have numerous miniature Micro 100 solid bars , but for the half dozen times a year maybe that I internal thread my home built jobbie works just fine.

michael
 
I bought a boring bar from Shars that was made for internal threading. It uses AG60 IR inserts. It works great. I cut more internal threads than external.

GG

boring bar.jpg
 
Just a note about the mesa threading tool and ar warner inserts .

I had bought the mesa tool and a set of ar warner hss inserts to use in it ... I loved them both , the Mesa tool was very high quality ..and the hss inserts made easy work of thread .

The disappointment came later .... I broke one of my inserts by dropping it ... a call to ar warner proved to be disappointing .. the inserts was back ordered and they could not give me a definite answer on when they would be available again ... four months later they still show as unavailable .
 
bosephus said:
Just a note about the mesa threading tool and ar warner inserts .

I had bought the mesa tool and a set of ar warner hss inserts to use in it ... I loved them both , the Mesa tool was very high quality ..and the hss inserts made easy work of thread .

The disappointment came later .... I broke one of my inserts by dropping it ... a call to ar warner proved to be disappointing .. the inserts was back ordered and they could not give me a definite answer on when they would be available again ... four months later they still show as unavailable .
Click to expand...

I have the same problem bosephus. If you find where to get some, let me know.
 
Think about getting a carbide bar for threading. Stiffer and less likely to deflect, which can cause severe problems.

Downside is it costs a lot $$$. Which is why I didn't buy them....

Grizzly has a set that is decent and is a reasonable price. Even more reasonable if you can buy inserts on Ebay instead of from them....

http://grizzly.com/catalog/2015/main/688?p=688
 
hmmm,
I like the look of these HSS inserts. T15 threading inserts sounds like a real winner for good smooth threads and some M2 for roughing and interrupted cuts.
I might have to invest in some of these and see how they work. It will be interesting to see if these inserts are sharper than what I grind myself
 
joshua43214 said:
............ It will be interesting to see if these inserts are sharper than what I grind myself
Click to expand...

Hey, if you are like me, can't sharpen anything sharp enough to cut mud!!! It's worth it! I haven't sharpen a threading insert in thirty years! I'm very spoil to using ground threading inserts of many shapes for many different thread forms over the years!

I too, been thinking of trying some of the T-15 HSS inserts. Hate the idea of having to buy another tool holder for these inserts...
 
4gsr said:
Hey, if you are like me, can't sharpen anything sharp enough to cut mud!!! It's worth it! I haven't sharpen a threading insert in thirty years! I'm very spoil to using ground threading inserts of many shapes for many different thread forms over the years!

I too, been thinking of trying some of the T-15 HSS inserts. Hate the idea of having to buy another tool holder for these inserts...
Click to expand...

I am fortunate that I learned a correct way to sharpen knives as a kid, I have a pretty fair hand at it.

You almost have to make a pact with the devil to get a fair curve on T15, the stuff is ridiculously hard and eats up the soft grinding wheels needed to grind it. You can put a really nice edge on it though, the kind of edge you normally only see on high carbon steels like what is used in razor blades. Should make for a very smooth cut on just about anything. I normally regard it as useless for shop made cutters because plain HSS gets about as sharp for 1/10 the work. I normally just go from grinder to the machine with HSS or cobalt and only touch up the edge by hand for finishing tools.
Internal threading tools are a pain to shape, these look like a they might be an excellent investment and hassle saver.
 
joshua43214 said:
......... I normally regard it as useless for shop made cutters because plain HSS gets about as sharp for 1/10 the work. I normally just go from grinder to the machine with HSS or cobalt and only touch up the edge by hand for finishing tools.
Internal threading tools are a pain to shape, these look like a they might be an excellent investment and hassle saver.
Click to expand...

I now have a K. O. Lee tool & cutter grinder I use to sharpen any tools with now, if an need comes up for special ground cutting tool. Especially any internal threading tools! At my older age, I don't have the steady hand and sharp eyesight I once had at younger age. Magnifiers are now my best friend!
 
You must log in or register to reply here.
Back
Top