Re: Radius Compensation---Leadin

Fred & Art,

Here's a possible simple solution......

G00 X-1 Y0 Z(clearance value here)
G42 D1
G01 X0 Z(depth value here)
X10
Y10
X0
Y-1
G40 (plus whatever else your controller needs to terminate CC)


The point here is to initiate/terminate CC off the part's contour.

Fred, What's the point in the circular entry/exit from the contour?
Won't it leave undesireable evidence of the entry/exit on the part's
straight contour section? Isn't line N16 extraneous?

thanks,

Doug

--- In CAD_CAM_EDM_DRO@y..., "Fred Smith" <imserv@v...> wrote:
> --- In CAD_CAM_EDM_DRO@y..., "Art Fenerty" <fenerty@h...> wrote:
> > Hi all:
> >
> > Can someone explain Lead-in's on radius compensation.
>
> > G42D1
> > X10Y0
> > X10Y10
> > X0Y10
> > X0Y0 What would be my leadin values after G42D1.
>
> Your program should be more like this:
>
> N9 G00 X5. Y-10. Z0.
> N10 G41 D1 G01 X7.8491 Y-4.5326
> N11 G03 X5.1 Y0. I5.1 J-3.1
> N12 G01 X0.
> N13 G01 Y10.
> N14 G01 X10.
> N15 G01 Y0.
> N16 G01 X5.
> N17 G01 X4.9
> N18 G03 X2.1509 Y-4.5326 I4.9 J-3.1
> N19 G40 G01 X5. Y-10.
>
> This was automatically generated in Vector-cam with a teardrop
> approach/depart. It climb mills around the outside of the 10x10
> contour. The cut starts at X=5 Y=-10, makes a straight cut greater
> than the radius of the cutter, arcs into the cut with a radius of
3.1
> which is greater than the cutter radius, climb-cuts around the
> contour, arcs away from the shape after overlapping about .2 mm
from
> the start point of cutting on the contour, then makes a straight
move
> back to the start position while turning off cutter comp with G40.
>
> Hope that is helpful.
>
> Best Regards,
>
> Fred Smith
> IMService
>
> P.S. I still disagree technically with the authors of EMC that the
D
> call out should be required at the same time as the G41. It's call
> out should be done at tool change time and remain in effect modally
> whenever a G41 or G42 is encountered. Very sloppy IMHO.