Re: [CAD_CAM_EDM_DRO] Screw cutting - Was: Lathe controller about micrtokinetics

Hi Fred.

I must disagree with you on this point. I regularly run at 800 RPM, and often
1500 RPM when screw cutting. Flood coolant, single point brazed tip carbide
tool and high speed, all help to give a good finish - especially on steels.

RPM is of course limited by the maximum Z traverse speed - a 1mm pitch can be
cut at a higher speed than a 4mm pitch - But surely one should be aiming at
the optimum cutting speed for the tool bit. Be it HSS or carbide.

Regards, Paul.

> Besides that, 1100 rpm is way too HIGH a spindle speed for most
> single point threading.

For example - Spindle speed ~1100 RPM, 24 TPI thread = 46 ipm feed approx.
Within the capabilities of most lathes I would have thought.