[alain aleman]

Wolog, i try to make with 50 Rpm but is same. The insert has a special geometry , and center tool is ok, also i trying with 0.017" deep of cut per pass, nothing. you are right, the material is SAE 4140.

Hi, CNCBoss. I´ll be thankfull if you send me some pictures when you make this kind of connections (rotary shoulder connections), i tell you that i used the tailstock because the leng of the crossover that i make is 20" or 25" and the diameter of 5" to 6", my HAAS TL-3 has 3.5" of spindle bore. Also I use steady rest, also nothing.

Thank guys for your attention,

Greetings from Peru.

Alain