Yeager CNC-Pro on Lathes?

****The following is pasted from an E-mail that was sent to Yeager
Automation:

>Hello Doug,
>I'm using CNC-Pro on a small lathe.
>Trying to turn a ball end on a piece of 3/4" round stock.
>I use 2 roughing passes and a finish pass.
>On the 2 roughing passes everything seems to be OK, but
>when it gets to the finish pass, it feeds in tword the chuck taking

a huge

>cut.
>I know the lathe must be set right, because I made a # 2 Morse

taper and, it

>came out great.
>Have spent a lot of time on this, trying to get it to work.
>Below is the short program I'm using:
>--------------------------------------------------------------------

--------------------------------

>G20 G18 G90 G53
>M03
>G4 P4000
>
>G0 X.750 Z-.125
>G2 I-.234 K-.078 X.563 Z0 F1
>
>G0 X.750
>Z-.187
>G2 I-.359 K-.172 X.375 Z0 F1
>
>
>G0 X.750
> Z-.375
>G2 I-0.374 K0 X0 Z0 F1
>
>M05
>M30
>
>I don't know why but I have to use a G2 call instead of a G3.
>At first I thought it was my code, now I think it might be the

controller,

>that is why I am writing you.
>I also ran this code with the X and Z values ahead of I and K, and

all

>sorts of other combinations.
>Yes or No is CNC-Pro set up for Lathes?
>If yes then what am I doing wrong?
>If no then I will continue to use CNC-Pro on my Mills & Routers

only.

>You have an excellent program, but I must know the answer to this.
>Below is a picture of what I am getting. I have to stop the program

short

>in order
>to keep from breaking the tool ect.
>Hopefully we can help each other out on this.
>Regards,
>John Mesh
>jmesh@...

***Below is the reply I got from Doug at Yeager Automation:

when using circle g2/g3 codes be aware of the setting in the
operator menu
for i,j,k relative or absolution coordinates to circle center. this
can
cause things to happen that are not expected if it is set one way
but
programmed another.
also, g2 g3 are clockwise and counterclockwise arcs about an axis.
i use
the right hand rule to determine which direction it will be circling
the
axis. if you take your thumb and point it in the direction of the
axis to
rotate about and ball your fist, the direction your fingers are
pointing is
couterclockwise.

**I have tried everything he said and still I can't seem to
make it work, anyone out there using CNC-Pro on the Lathe?