major interrupted cuts on lathe

- B
- Brian
  
  Contact options for registered users
posted
18 years ago

Wed, Aug 6, 2003 8:23 PM

Do you think that one could take a really interrupted cut - cutting the OD
of automotive crankshaft counterweights to a smaller OD - in forged EN-19
hardened steel? The hardening is a surface treatment (nitriding, or
equivalent), but I suspect the steel is damn tough. I know it can be done,
because I've seen the end result, but could I do it with a SB 16" lathe? I
was thinking low rpms and 3/4" HSS tool. Diameter of the OD is about 8" or
so.
Brian

- D
- Dave Baker
  
  Contact options for registered users
posted
18 years ago

Wed, Aug 6, 2003 8:34 PM

You won't touch the webs if they've already been nitrided. It's rock hard. Even on the raw billet it's a tough cut for a normal lathe. You can bugger the bearings and gears fairly quickly. We made a few billet cranks some years ago from scratch and the offset cuts needed a really big lathe and plenty of power. Still shook the floor a fair bit.
Dave Baker - Puma Race Engines

formatting link

I'm not at all sure why women like men. We're argumentative, childish, unsociable and extremely unappealing naked. I'm quite grateful they do though.

- I
- Ian Stirling
  
  Contact options for registered users
posted
18 years ago

Wed, Aug 6, 2003 9:06 PM

Might simply taking an angle grinder/dremel to remove the coating on the bits where the tool will impact the work, work?
Once you get under the hard coat, it shouldn't be too hard. (?)
Alternatively, some means of mounting the angle grinder (and lots of protection for the delicate bits.) may take care of it in short order.

- S
- Stan Schaefer
  
  Contact options for registered users
posted
18 years ago

Thu, Aug 7, 2003 4:25 PM

I was thinking more in terms of genning up some sort of belt grinder for the toolpost. I've seen something similar that gunsmiths use on gun barrels, you'd just want a coarser grit belt. Way covers needed for sure.
Stan

major interrupted cuts on lathe

Further Reading

Interrupted lathe cuts -- Technique?

Lathe - Poor surface on cuts

Interrupted Turning

Jog on a lathe

Lathe chatter on shaft

Cuts on Sheet Metal Cylinder

Flat belt on Logan lathe

Imperial thread on metric lathe!

Reversing leadscrew on small lathe

Basics on Depth of Cuts

Thread cutting on a reversible lathe

Carriage play on Atlas Lathe

Endless lathe chips (re-adjusted the clutch on a Clausing 6913 lathe)

cuts

Any comments on Clausing 6903 Lathe?

OT- ford crown vic- what's the deal?

Brass bonding?