Re: [CAD_CAM_EDM_DRO] Thread milling

Thanks to everyone who responded to my thread milling question.
I didn't understand how the G02/3 commands really work. If I
read Jon's expaination below correctly, the G17/8/9 commands
specify which plane the arc specified by the G02/3 command will
lie. Any movement specified for any other axis in the G02/3 command
will be linear. Pretty cool. Oh, and Jon, thanks a bunch for the
pointer to your G-code generating programs.

Thanks again,
Drew

Jon Elson wrote:

>
> With modal command G17 (arcs interpolated in the XY plane)
> then any arc commands only cause circular motion in the X and Y
> axes, and the Z axis is still linear. You do not specify a G01 for Z.
> With G17 in force, and movement specified by a G02 X... Y... Z...
> (and some I, J or R word to program the radius), you will get
> a helical motion around the Z axis. This will get your thread milled
> with an appropriate cutter.
>
> You do NOT make short linear segments, just one command for every
> 1/2 or 1/4 revolution, depending on some details of your CNC control.
>
> Jon
>

--
Drew Rogge
drew@...