Bue

B

Boe

Member
I was threading a barrel today with a new tool holder and new HSS insert. After every pass I had Built Up Edge on the insert. Checked setup. Everything looks good. I tried speeds between 140-320 rpm. Infeed was between 2-12 thou. per pass. I tried my normal cutting fluids Ridgid and Supercut. I still had the same results. I had to stop and stone the insert before I made the last two passes to clean the threads up. The insert seemed as sharp as any I have used. Never had this happen before. Any ideas? Boe
 
You will sometime have a small burr that is not obvious to the eye. Honing the cutting tool ussually remedies the situation. Happen oftener than you might think.
 
Boe said:
I was threading a barrel today with a new tool holder and new HSS insert. After every pass I had Built Up Edge on the insert. Checked setup. Everything looks good. I tried speeds between 140-320 rpm. Infeed was between 2-12 thou. per pass. I tried my normal cutting fluids Ridgid and Supercut. I still had the same results. I had to stop and stone the insert before I made the last two passes to clean the threads up. The insert seemed as sharp as any I have used. Never had this happen before. Any ideas? Boe
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Questions,
Have you ever threaded this barrel before?
Sounds like Chromemoly (or bad heat treat)?
Lots of workpiece overhang can cause some BUE.
What grade insert, HSS, HSSCo, ChiCom import?

-too deep infeed. 0.002"/side (compound feed) is about right for intermediate cuts but 0.012"/side is a bunch.
 
Jerry,
The barrel was a new 416 Stainless steel blank. The overhang was about 2 inches. The insert is a HSS insert and the holder is made in the USA. I was infeeding 0.003/ side for about 4 or 5 passes then noticed the BUE. So I stoned it off. I noticed it was building up on every pass.
 
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