I've got a job in 304 SS right now which has some custom thread. its 6-32 on both ends but custom 24tpi in the middle. This means the diameter is 0.138" or 3.5 mm. I'm using a collet chuck and 3/8" stock. I rough and finish a small section, then turn the threads. Then rough and finish the next section and turn the threads - attempting to minimize deflection.
I did make 1 good part, but the next day, the same toolpath, same setup, breaks the stainless off during threading. I had tried running this toolpath previously with no coolant on and the stainless broke everytime. I ran it with coolant and succeeded, now, as mentioned, same toolpath, with coolant. Snap! I am new to cnc lathe threading. I've been using 500RPM, and whatever feed rate goes with it, 10 thou depth per pass on the threads. I wonder if the SS is work hardening?
Any suggestions on turning small diameter stainless threads with a slant bed CNC lathe?
I did make 1 good part, but the next day, the same toolpath, same setup, breaks the stainless off during threading. I had tried running this toolpath previously with no coolant on and the stainless broke everytime. I ran it with coolant and succeeded, now, as mentioned, same toolpath, with coolant. Snap! I am new to cnc lathe threading. I've been using 500RPM, and whatever feed rate goes with it, 10 thou depth per pass on the threads. I wonder if the SS is work hardening?
Any suggestions on turning small diameter stainless threads with a slant bed CNC lathe?