Randy V

They must have been using silver-coloured butter as a demo.

No way you can cut a tempered alloy without using machining coolant unless you are only doing a one-off and don't care about heat shock and tooling bit failure.

The stuff my company machines makes this look like a kid working with playdough.

Still cool though.

M. Requin

That machine is using coolant- air. Probably not at room temp, and a pretty good flow judging from the chips.

RKD in OKC

Way back in the 90's when the company I work for first started using CNC mills instead of multi-spindle drill presses, one part went from 22 hours machining time to 22 minutes. The very expensive CNC mill paid for itself in 6 months of production savings. Other parts are much faster being produced on CNC lathes. Some are faster on old multi-station Lathes. Depends on what machine the part is designed to be produced on.

Most of the CNC mills we use poke holes so fast this demo looks slow. Ours force coolant at the tips of the cutting tools at 1000 psi to machine 316 stainless steel (pretty hard stuff).

Fogey1

That's really impressive.

I did not understand the thread tapping process at the end, if that's what it was. It looked like the tap was rotating much faster than it plunged. Wouldn't that defeat the process and leave a (relatively) smooth, un-threaded hole?