RE: [CAD_CAM_EDM_DRO] Re: Radius Compensation---Leadin

What is the D parameter for? I use a Sharp mill with a ServoII CNC
conversion on it, and haven't heard of this yet. Tool changes are specified
by a T command, and their diameter and Z offset remain modal until the next
tool change.

Thanks,

Ward M.

wardmerk@... <mailto:wardmerk@...>



-----Original Message-----
From: Fred Smith [mailto:imserv@...]
Sent: Wednesday, July 25, 2001 1:48 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Radius Compensation---Leadin

--- 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.


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