Need Boring Help

From what little I could find on machining cast stainless steel, it looks like that stuff is tough on inserts. I would have to defer to Dave. It sounds like he has a lot of experience with that stuff.

Still, your insert looks to be the equivalent of a CDCD505 insert with a 0.007" NR. It should have bored that wheel. I don't know what the cutting speed of cast SS is but most stainless is pretty high, up around 500sfm or so. I wonder if a higher speed would work better? I've bored a lot of stainless but it has been 303, 304, 316 or 416 - never did cast SS.

Before I destroyed more inserts, I would contact Widia and speak to one of their engineers.
 
Is the material magnetic?
Stainless bolts are non ferrous, in my experience.
 
1/2" endmill and bore remainder might work?
 
Bore is 10mm- needs to be opened to 12mm.
 
I also need to drill and tap M4-.7 for a grub screw as the keyway will be all but gone after boring. Not sure how to deal with the burr as I have no deburring tool for that type of operation.
 
Janderso said:
Is the material magnetic?
Stainless bolts are non ferrous, in my experience.
Click to expand...

300 series stainless is non-ferrous . What about all the 400 series and customs ? ;) If you can heat treat it , it's ferrous .
 
Go with a solid carbide bar if you need to . I use Kennemetal top-notch bars usually or micro grains in small stuff as that bore .
 
My bar is carbide. I may punch the hole out first with a 29/64 drill then finish with the boring bar.
 
That drill sure won't like that keyway ! ;)
 
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