Material Turning Comparison

[cascao]

After few tests ended with this results:

SS 304 have gone very well.
A36 better than 1020
4140 "same" finish as 1045 and 8640

 

[T Bredehoft]

Excellent research, good comparisons, from that we know what we can expect on our machines.

 

[cascao]

There another research on tools finish too.
http://www.hobby-machinist.com/thre...ar-tool-win-do-you-know-it.42510/#post-365322

 

[woodtickgreg]

Useful, now I don't feel so bad about the finishes I get with my plain old hss cutters and hot rolled steels that I salvage, lol. My finishes actually look a little better and I really am not super skilled at turning, just trial and error. If I don't like the finish I am getting I change something, speed, cutter grind, feed, etc. until I get the desired result.

 

[ch2co]

What lubricant were you using, if any? I do notice some smoke coming off of some of the cuts.
I'm a real newbie when it comes to anything steel, I just finished a somewhat similar test for a piece of steel that I didn't know the composition of, and I found that lubricants can play a BIG part in the final finish.

CHuck the grumpy old guy

 

[cascao]

I've used Tapmatic 1.
Considered god finish on 1020, A36 and inox 304.
Others steels where bad.

The macro photos does'nt help but I experted better finish at least from 1045.

My tools had very small radius....