Brett W
Cast Iron
- Joined
- Jan 10, 2014
- Location
- Huntsville AL
I was ask to quote, (and pretty sure I am going to turn down) a job today. Part is a 2.25in ring .170 thick, with 16UN thread on the OD, 1.650 ID. This is some sort of retaining nut for inside a tube/bore/etc.
Customer ask for 17-4 heat treated to HR1025 and passivated. So I get to looking at the part and in my mind making this involves the following steps:
Rough machine each ring (20), leaving .050 or more material oversize.
Send out of heat treat
Receive Taco chips back and possibly surface grind flat both sides
Grind ID back to shape to use as a reference for OD threading and finishing operations
Then clamp in fixture and use Mill to thread mill threads into perimeter of said ring.
As I have been told HR1025 is about 40Rc? Being that it is stainless, it will be brutal on tooling if trying to finish machine threads in a single point fashion, assuming I could get it straight enough after heat treat to actually thread within tolerance.
Option 2 rough cut threads and have them finish ground?
Obviously I am out of my depth here on this project, but looking to learn at least the process, not necessarily to do the job.
Customer ask for 17-4 heat treated to HR1025 and passivated. So I get to looking at the part and in my mind making this involves the following steps:
Rough machine each ring (20), leaving .050 or more material oversize.
Send out of heat treat
Receive Taco chips back and possibly surface grind flat both sides
Grind ID back to shape to use as a reference for OD threading and finishing operations
Then clamp in fixture and use Mill to thread mill threads into perimeter of said ring.
As I have been told HR1025 is about 40Rc? Being that it is stainless, it will be brutal on tooling if trying to finish machine threads in a single point fashion, assuming I could get it straight enough after heat treat to actually thread within tolerance.
Option 2 rough cut threads and have them finish ground?
Obviously I am out of my depth here on this project, but looking to learn at least the process, not necessarily to do the job.