I've been operating and programming this lathe for about a year and have a question about some code that starts at the beginning of each program. I am still pretty wet behind the ears as far as programming is concerned. And when the guy from EMCO set up the machine, he didn't necessarily explain the reasoning behind this particular line of code. And now that I am beginning to use material with a larger diameter, I am curious if I need to change it.

Here is the opening block for these programs. (I have been using 0.250" and 0.375" diameter round PTFE. I now have to move up to using 0.750" diameter round PTFE).

O2160(NR2-160 2W DIAPHRAGM)
#5242=.670(SET G55 Z VALUE)
G55(SET WORKSHIFT)
G192S3000(SET MAX RPM)
G1900D0.375L0.5K0.02
G95F50G90
M05
T00
G00X5.0Z10.

The highlighted line is what I wanna know about. The Fanuc programming manual doesn't have a definition for a G1900 or G190 code and the G19 code puts in a Y-Z plane. I carefully assume the D0.375 refers to the stock diameter, but I'm not sure what the L and K designations are for. Any help would be greatly appreciated. We just got this machine last year, and I'd hate to crash it on some dumb stuff.

Thanks in advance!

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