I'm incompetent. I want to machine a shaft sleeve part with a CNC lathe. The diameter of the inner hole is 80. What size drill should I use?

It's not like how big a twist drill is used to process threads. I suggest you use 25 gauge, and then use the inner hole knife for the car.

G00X20.0Z2.0

g 7 1u 2.0 r 0.5；

g 7 1p 10q 20u-. 05w0f 0. 15；

G00X80.0

g 0 1z 0；

z-80.0；

Q20G00X20.0

g00x 100.0 z 100.0m 05；

M00

m03s 1200 f 0. 15；

G00X20.0Z2.0

g70p 10q 20；

M05

M00 is enough. I suggest you use fanuc.

Of course.

It's simple. You must consider the length of the handle and the width of the knife before you do it.