Need to machine threads on a socket extension

[wwendorf]

Hi everyone,

I need to turn threads into a portion of a standard socket wrench extension. The material is chrome/vanadium. I need to turn it down from .482" to .372" then turn threads into it. I tried it tonight and promptly destroyed an insert.

Can anyone give me information on:
- Feeds and speeds
- type of inserts to use
- do I use coolant with it?

Any other information on how to do this would also be appreciated.

Thanks,
Wade

[JimBoyce]

It sounds like the turning tool broke before you even got to the thread. If this is the case grind the square off or grind it roughly round, even with a bench grinder and then finish turn. A spin indexer on a surface grinder would be a good alternative.
Try turning at 300 RPM (35 SFM) with a 0.002 Feed Rate. Like always these are just starting suggestions. Thread at 100 RPM (9 SFM) with flood coolant or cutting oil applied with a brush. Good rigidity is very important with this type of work.
Welding a bolt into a socket may also be an alternative.

[wwendorf]

Just for information sake, I was trying to turn it at 1000 rpm with a feed rate of .002 and a DOC of .015.

Wade

[wwendorf]

Thanks for the info. I turned it at 400 rpm's and it worked.

Thank you for the help!

Wade