Re: [CAD_CAM_EDM_DRO] Re: Re: Can CNCPro users provide some input? - cutter comp

If you happen to have Quick CAD you'll find "computing" the location of the
cutter start postion as it goes into comp a breeze...the program calculates
it for you...to whatever degree of accuracy you need.

Smoke

>
>Alan
>
>There is a page on LinuxCnc.org about the way the EMC does comp. Jon E
>also has a page on his wusl site.
>
>There are several ways, including arcs, that you can approach the comp
>offset. I did some experiments while writing the handbook comp page and
>found that if you know the offset and the start of cut position in advance
>of the g42/43, or compute it some way, and use that info to move to the
>start position, you can begin comp right where you want to cut. The only
>thing that the EMC cares about is that you not gouge the surface that you
>are comping away from during the approach. It computes a possible
>gouge to some incredible degree of accuracy so the start position math has
>to be good.
>
>From: Alan Marconett KM6VV <KM6VV@...>
>
><s>I've heard that the controller must have straight line enter and exits,
>>to give it time to switch into/out of comp. I really haven't much of an
>>Idea how it works, although I can see it simply as an offset in the CAD.
>>I'd like to hear/understand more about it.
>
>If you read a bit of c c++ you can look at the source code that Tom Kramer
>wrote for the emc. These routines are very well documented.
>
>Ray
>
>
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