Re: Yeager CNC-Pro on Lathes?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Mesh" <jmesh@h...>
wrote:

>
> ****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@h...
>
> ***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?

John

I do not use CNC-Pro or run a lathe on CNC so this is only a
suggestion to try. Do you need to change the "plane" which you are
trying to run the G02 code in. ie. Should your code look like:-
G18 (select x:z plane)
G02 X??? Z??? J??? K??? F???

Just something to try.
Greg B