On Fri, 04 May 2012 10:49:53 -0500, Jon Elson
wrote:

Ignoramus302 wrote:

On 2012-05-04, PrecisionmachinisT
wrote:


Thread mill in the cnc then chase by hand with a tap




Thread mills are super expensive.
Single-row thread mills are much less expensive, and can be used over a
range of thread pitches. If this job only requires a few parts, that's
what I'd do. Thread milling is an awesome process, and great for things
you don't need a lot of.

Jon

It's great especially for applications where the load on a
conventional tap is high enough to risk breaking a lot of taps. In
superalloys and some other tough or gummy alloys, it's much more
practical than conventional tapping.

--
Ed Huntress