[Eagle View]

Hi,
I am still trying to figure out my CNC Lathe.
I need a simple way to figure out feed rates for tapping.
Specifically, I need to tap using a 5/8x18 tap.
I know it's probably very simple, but I am not a machinist, I am simply a
"Jill of all trades" trying to learn more.
Thank you in advance.
Ardis from Eagle View

[Eurisko]

The feed rate (in inches per revolution) is simply 1 divided by the number of threads per inch.

A 5/8-18 tap requires a feedrate of 1/18 or .0556 ipr.

If you are programming in inches per minute, the feedrate will be the spindle rpm divided by # of threads per inch.

For example, at 360 rpm, the feedrate will be 20 ipm (360/18).

I assume that your control supports rigid tapping

[Eagle View]

Eurisko,
Thank you so much for your simple, easy to understand explanation.
The books I am reading say the same thing, but in a convoluted, confusing way.
This I can understand.
Ardis from Eagle View