Re: Re: Radius Compensation---Leadin

> Date: Thu, 26 Jul 2001 01:24:21 -0000
> From: dougrasmussen@...
>Subject: Re: Radius Compensation---Leadin
>

Doug- The EMC requires that the D offset be called out on the approach
line where Cutter comp is turned on

N10 G41 D1 G01 X7.8491 Y-4.5326

That is the issue that I dealt with in the closing note about the contour.
EMC team should have known better but they didn't and even though this
was pointed out to them a couple of years ago, it's not been "fixed".

Also I always recommend that people position to depth before turning on
Cuttercomp. Some controls will allow Z positioning inside a cutter comped
activity, but many will automatically turn off cutter comp and move from edge
cutting to center cutting and result in a gouge or broken cutter or both.

>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?
>

The point of the arcing start and end cuts is that you cut all the way around
and have no divots from starting or stopping, and if you try to start cuttercomp
with a cut onto the final geometry, you can easily end up with an uncut area
and tool deflection at startup. My sample toolpath has both arc in and arc out
which leaves no dwell marks like you get if you plunge straight in with a
Z move, and the .2mm overlap assures there is no missed material. This kind
of cut would normally be used for finishing not roughing and you would have a
very difficult time detecting the actual location of the start or stopping point.

Vector also can generate the tool path with multiple passes in Z so that you
can cut say 1/2 inch deep and make .05 depth of cuts. Each level will be
automatically generated with the arc in and out and connected to the next level.
The function is called contour tooling. Vector turns cutter comp off and on
automatically at each pass. No editing.

Line N16 is needed because I changed the start and end of the cutting from
the corner that was originally used (0,0) to the center of the first line along the
X axis. (x=5). I also changed the direction of cut and comp side to allow climb milling.

Best Regards, Fred Smith- IMService
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