Rick Finsta
Stainless
- Joined
- Sep 27, 2017
The Kennametal/Erickson thread roller attachment just caught my eye. I was handed some shaft work this week and had to work around a 0.007" taper from thread start to thread end on both ends. I know this is a part that could be much more economical to have done at a place with thread rolling machines, but it is short run stuff so who knows.
Part was 8.5" long 0.500" OD stainless round bar of unknown grade, but cut more like 316 than 304 and was nonmagnetic so I doubt it was 416. Each end had a 2.25" long thread, one side 1/2"x13 and the other 1/2"x20. I didn't have time to switch the barfeeder over so we saw cut blanks and hand fed to a turret stop, threaded one end, then flipped for the other side.
Are there any tools that will go into a boring bar holder on a turret lathe and allow threads like this to be rolled instead of cut? If this was 304 I bet I would have been chasing the deflection number constantly. Or would something like a geometric threading tool take care of this? I've never used one of those, either.
Part was 8.5" long 0.500" OD stainless round bar of unknown grade, but cut more like 316 than 304 and was nonmagnetic so I doubt it was 416. Each end had a 2.25" long thread, one side 1/2"x13 and the other 1/2"x20. I didn't have time to switch the barfeeder over so we saw cut blanks and hand fed to a turret stop, threaded one end, then flipped for the other side.
Are there any tools that will go into a boring bar holder on a turret lathe and allow threads like this to be rolled instead of cut? If this was 304 I bet I would have been chasing the deflection number constantly. Or would something like a geometric threading tool take care of this? I've never used one of those, either.