Internal threading tool

Here's the pictures I promised in post #6 above.

This one has a set screw in the end of the bar:
boring_bar1.jpg

boring_bar2.jpg

This one has the set screw on the "top" of the tool bit:
boring_bar3.jpg

boring_bar4.jpg

I thought I had one with the tool bit at 45 degrees, for boring flat bottomed holes, but I cannot seem to locate it.

-brino
 
I second the Made in Oregon Mesa threading tools. They are good quality, not expensive, the inserts can be found on ebay pretty cheap. I have numerous hand ground HSS bits that I have used for 40 years, just recently tried the Mesa tools , I like them alot.
 
Doubleeboy said:
I second the Made in Oregon Mesa threading tools. They are good quality, not expensive, the inserts can be found on ebay pretty cheap. I have numerous hand ground HSS bits that I have used for 40 years, just recently tried the Mesa tools , I like them alot.
Click to expand...

I got my tool and immediately dropped it and broke one of the tips. Then on my first threading attempt I messed up and broke the other tip :) Yay learning!

Do you know what I need to search for on ebay to find the inserts? The only ones I can find are the triangle looking ones.
 
I buy them from Mesa, a box of ten of each LH and RH. Seems like chipping the one supplied with the tool is a common entry fee. Now I know how to make them last.
 
When you are just starting out, it is most economical to start out with something quick and homemade. Stefan has a good design on Youtube, but you have to be careful using this for threading tools. The angle of the cutter should be no more that 30 degrees.
 
Today I stumbled across some boring bars on Harold Hall's site, see photo 3 here:
http://www.homews.co.uk/page140.html

They could also be used for internal threading.

I like that his bars that have the cutting bit at 45 degrees, also have a flat at 45 degrees on the end of the bars....presumably for the set-screw to hold the bit.

-brino
 
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